#video on #manufacturing clay #ceramics jar lids to be lapped with carborundum paste so they fit perfectly.
on 02026-08-24Emily #Velasco on #Mastodon firing clay into #ceramics for printed-circuit-board #electronics, successfully building an astable-multivibrator circuit. #DIY #bootstrapping #scouting
on 02026-06-03#Primitive-Technology #video on firing #ceramics in a downdraft kiln of George Wright’s “Phoenix” design
on 02025-12-05#Fraser #video on adding flour water and vinegar to “wild” clay for #ceramics to improve plasticity
on 02025-12-04#Fraser #video on pit-firing #ceramics: 10–25% temper by volume for open-flame firing in under an hour, the temper consisting of mortar-pulverized charcoal. He fans the fire to get the pots up to temperature before letting the fire burn down.
on 02025-12-04The quartz inversion that causes dunting in #ceramics happens nominally at 573° but really over a 50° window centered on that temperature.
on 02025-10-248000 BCE was “pre-pottery Neolithic” (type site: Jericho) because Mesopotamia didn’t have vessels made of #ceramics, but the oldest known pottery vessels are from Jiangxi from 18000 BCE (in Xianren Cave), and the #Czech Venus of Dolní Věstonice is from 29000–25000 BCE. #archaeology
on 02025-10-10#Primitive-Technology #video on cylindrical water bellows made from fired clay #ceramics with folded-leaf check valves, sunk in a clay-lined puddle to use as two liquid pistons. One of his undersized fired-clay handles broke off, so he lashes on wooden handles. He’s still doing a lot of unnecessary work lifting massive fired clay vessels. Then the spout broke off.
on 02025-10-05#pottery-to-the-people video about soaking #amigurumis in clay slip for #manufacturing #ceramics. Bisque firing in an electric kiln to get a super lightweight amigurumi duck, then dipping in glaze and painting some on (and breaking off the fragile feet). It looked a lot better before glazing.
on 02025-10-01latest #Primitive-Technology #video on “belt and pulley blower” covers bark twine, leaf-fiber-reinforced dried clay, crushed-ceramic grog, clay bats, etc. Dried-clay pulleys break, unsurprisingly, even with crushed-leaf reinforcement, but do work for a while. 17-warp larger cane wicker pulley doesn’t break. Wood stake frames lashed with bark. Split-stick crank clamps shaft. He sets up a wicker “floating wheel” which permits his twine belt to fan the fire somewhat higher. #ceramics #DIY #bootstrapping
on 02025-06-12#video on making #ceramics without spending any money using “wild clay” and wood pit firing in his cornfield
on 02025-03-09#video by Mikkel deMib on pit-firing #ceramics #materials with glaze, which he says is “theoretically impossible” I guess because you’ll lose the pit-firing colors. He’s going to try on a porcelain vase he previously glazed the inside of at 1260°, which he says will guarantee that it’s waterproof anyway. Also his idea of “pit firing” seems to involve a steel drum; I think he's just calling it “pit firing” because he’s using wood, even though no pit is involved anywhere. He colors his once-fired white porcelain with ferric chloride, and cobalt sulfate, and some rotten banana peels, and copper carbonate, and salt, and steel wool, and newspaper, and coffee grounds, and eggshells, all wrapped up in “tinfoil”, probably aluminum foil, because he probably doesn’t know the difference between aluminum and tin. To stick the “tinfoil” to the ceramic he uses hairspray or spray glue. Some of the “tinfoil” survived until the end of the “pit firing”. It all kind of looks horrible; he keeps saying it looks “much more interesting” but to me it looks like mold grew all over it.
on 02024-08-26#video #toread with #ceramics pit-firing tips and tricks
on 02024-08-26#clickbait #video #toread about #ceramics #air-conditioning #cooling #todelete
on 02024-08-04#video #toread by #Tony-Soares about the “urban Anasazi” #ceramics firing technique
on 02024-06-25#video on testing fired-clay #ceramics and books for stopping hatchets and rubber bullets for armor
on 02024-05-15#video finding fired-clay #ceramics are surprisingly good at stopping bullets for armor
on 02024-05-14#video #toread on how to “make” #ceramics clay from dirt
on 02024-05-08#video #ceramics “firing the replica Roman pottery kiln at Vindolanda”. Except for the mud chinking or “clamming” of the “roof” or “capping”, this “top-loader” kiln is reusable, built in imitation of a Roman-era design, and they fill it full of 88 pots before wood-firing it, with a voiceover explaining how the Romans did it. Eventually they’re firing in reduction, with flames streaming out of the exit flue at the top. Their thermocouples say the maximum temperature reached was 958° after using 107kg of wood. If I had to guess, they had fired about 40kg of pots. They waited until the next day to open the kiln, presumably to prevent thermal shock, and the firebox was empty, meaning that the kiln had probably gone back into oxidation before it finished cooling, preventing the production of the desired black ware. No pots broke, though.
on 02024-04-06#video #toread on cooking in “wild” clay #ceramics #bootstrapping
on 02024-04-06#video on saggar firing #ceramics in a homemade raku kiln. But her saggar is ALUMINUM FOIL‽ Before firing she applies a terra sigillata coating to bone-dry clay, then burnishes it with a lint-free cloth to a beautiful shine, much like a #dorodango. After bisque firing (which seems to remove the shine, so maybe 995° wasn't hot enough to vitrify the terra sigillata) she pours ferric chloride over the pots, which surprisingly restores the surface smoothness, and after it dries, does it again. Then onto the wet ferric chloride she sprinkles blue vitriol, green vitriol, and Miracle-Gro from salt shakers, along with sugar and epsom salt. To protect her dining-room table from the ferric chloride she uses a polyethylene tarp. Inside the base of the “saggar” she adds straw or pet-shop sawdust to, I suppose, create a reducing atmosphere, and also apaprently to blacken the base of the pot. She also includes some bladderwrack or copper wire or saltwater-soaked twine or horsehair to mess up the pot’s surface more, then wrinkles the foil shut around the pot to make the final “saggar”. She did the initial bisque firing in an indoor electric kiln, then the final “saggar” firing in a gas-fired ceramic-fiber-insulated giant soup pot. Warns about the chloride fumes. Her target temperature for the “saggar” firing is 750°, which seems like plenty to melt aluminum, and her target ramp-up time is 35–40', after which she turns the kiln off, waits for it to cool to 300°, and then opens the kiln to remove the miraculously-still-intact aluminum-foil “saggars”, though she says, “On some of the pots it will have almost completely crumbled away.” She unwraps the others while still hot to permit some oxidation. When cool she polishes them with furniture wax.
on 02024-04-06#Andy-Ward on how to “make” clay. #ceramics #video #toread #bootstrapping
on 02024-04-03#Andy-Ward #manufacturing an earthen oil lamp #bootstrapping #ceramics #video #toread
on 02024-04-03#alchemy from a 1200-year-old Islamic (Rhazes) manuscript (the Book of Secrets) saved his #ceramics? Mostly a how-to on digging, levigating, drying, and tempering clay to make a workable clay body, although at first he’s leaving out the temper in order to get a handle on shrinkage, then uses a charcoal temper; his clay is very brittle and not very plastic. So he adds water from cooking rice to it, opaque with suspended/dissolved rice starch, to improve its workability. As you’d expect, it also seems to add significant elasticity to the clay, although not as much as I would have feared. Then he mixes in ground rice flour and finely chopped hair (as #Rhazes recommends) and charcoal as tempers. But he doesn’t try actually firing it! Dammit. By #Fraser-Builds. #video
on 02024-04-03#Andy-Ward #bootstrapping #ceramics into #manufacturing a mug #video #toread
on 02024-04-03a US$100 backyard raku gas kiln from ceramic fiber, not counting the cost of the weed-burner torch or the zirconia kiln shelf (discarded by a pottery studio). Interesting note, he sewed the ceramic-fiber roll onto the oil-drum walls with stainless steel wire, but suggests that nichrome would last longer. #ceramics #bootstrapping #video
on 02024-04-03#Fraser builds an 800-year-old blowtorch or "blow lamp" design: a terracotta #ceramics oil lamp, sealed by being cooked in milk and then coated in linseed oil, blown with a copper mouth blowpipe. It works to solder copper wire. He built two separate wicks onto his oil lamp so he can light the larger wick when he wants more power, and eventually used a 3-D printer hotend for the blowing aperture. He recommends T.P. Danger’s 19th-century book “Art of Glassblowing” for lampwork and scientific glassblowing information. And of course one way to make a blowpipe is by glassblowing. #bootstrapping #video #manufacturing
on 02024-04-03using the Kitab Al-Asrar by Al-Razi (Rhazes) #Fraser-Builds fixes his clay for #ceramics. #alchemy #video #toread
on 02024-04-03#Andy-Ward #tutorial on pit-firing greenware #ceramics. He tempers his pots with 20% sand and shoots for 800°–850° for about half an hour, though he maybe was a little short this time. #video
on 02024-04-03against microwave kilns #video about #manufacturing #ceramics. The dude has been firing “copper clay”, previously with I guess a blowtorch? And melting parts of a lot of his pieces instead of just sintering them. He thinks the susceptor on the one he bought is carborundum. It’s black, anyway. He’s using an 850W microwave, set for 8 minutes, and some “kiln paper” to prevent sticking. He also puts kiln paper under the kiln to keep it from heating up the glass turntable, which he says was getting “worryingly hot”. The inside of the kiln glows orange. He quenches the copper in water, which seems like it would be a bad idea with ceramics, but he says is required with “metal clay” (presumably copper and silver but not gold). He says the kiln stays hot for 5–6' after opening. But you shouldn’t buy it because it’s inherently dangerous and the manufacturer is anonymous, and speculates it might explode if overfired (it won’t).
on 02024-04-03#Andy-Ward on three ways to make #ceramics without a kiln: open above-ground wood firing, wood smothered pit firing, and Tony Soares’s method of charcoal firing in a makeshift brick kiln with an inverted steel bucket. #video
on 02024-04-03#Andy-Ward sealing and cooking in unglazed earthenware #ceramics #bootstrapping #toread #video
on 02024-04-03making a #ceramics kiln out of an old oven, but he could only get it to 820°. #video #hoarding #toread
on 02024-04-03#Andy-Ward demolished his primitive #ceramics kiln because he likes firing in an open fire better #video
on 02024-04-03#TKOR firing #ceramics on a barbecue grill #bootstrapping #toread #video
on 02024-04-03#Andy-Ward on wet-processing “wild” clay for #ceramics #video #toread
on 02024-04-03#Andy-Ward on four types of “wild” clay for #ceramics #video #toread
on 02024-04-03#Andy-Ward warns of dangers of caliche for #ceramics #video #toread
on 02024-04-03#Andy-Ward on #bootstrapping clay for #ceramics from dirt, part 2. Recommends looking for “crackle texture” on the surface to locate dirt with a high clay content, then feeling for hard lumps. Later screen the clay to remove large particles, then paint strainer bags for removing silt, and levigation if that’s insufficient. #scouting #video
on 02024-04-03#manufacturing #ceramics in a 01978 Amana RadaRange microwave oven he got for US$15 #video (kind of stupid, this guy Erik Gellert has no idea how to make this actually work, and just ends up drying out his plastic clay and getting some steam explosions)
on 02024-04-03#manufacturing #ceramics by pit-firing in your back yard #video full of bullshit about pores in pottery opening with heat and closing when cooling, confusing grog with tempers in general, how “mineral vapors” produce different colors, etc., plus lots of useless footage of some guy talking to the camera #pseudoscience #misinformation
on 02024-04-03#Andy-Ward on #manufacturing #ceramics from store-bought materials in the city. Some talking-head filler. But mostly he buys clay at Hobby Lobby and makes pottery from it with pottery tools from Michaels (another craft store) and fires it in his yard. It’s probably a ball clay body, Hobby Lobby Moist Pottery Clay X-15. He tempers the clay with a bunch of sand from a nearby dry wash riddled through a screen from his house window. He coils the pot in a thrift-store bowl, protected with a wet handkerchief; the bowl allows him to rotate it. Before firing he stone-burnishes it with petrified wood. To protect his driveway from burn marks, he dumps another bucket of sand on it. He preheats the pot in the kitchen oven to dry it, then uses three bricks on the sand to make a sort of three-stone stove to hold up the greenware pot, then fills up the rest of the fire pit with charcoal briquets. He builds the fire pit three bricks tall, without mortar, puts an upside-down metal bucket (US$19) over the pot to prevent the charcoal above it from damaging it, and covers the top of the charcoal with a barbecue grill supporting large pot shards to keep the heat in. His thermocouple registers 700°, and the pot did sinter properly despite the clay being labeled for cone 5 (about 1100°). In total he spent US$97. He calls the three-brick technique “urban Anasazi”, crediting Tony Soares. #video
on 02024-04-03incorporating metal turnings into fired-clay #ceramics makes blurry red and black spots in the glaze; further reduction firing in gas produced blotches of iron and copper on the surface. Later he has to Dremel the bases a bit because his glaze stuck to the “wadding” feet he had stuck on there. #materials #video
on 02024-04-03Carolyn Moorlag's 01997 master's thesis #paper #PDF on reacting alumina #materials with phosphoric acid and other #phosphates in a #sol-gel process to produce CBC #ceramics, surveying a lot of the work since Kingery's original explorations. She talks about composite sol-gel ceramic systems (with majority ceramic inert functional #fillers), and mentions that for "metal-matrix composites" the ceramic-reinforcement/phosphate binder mix is cured at 400-900° and then infiltrated with metal.
on 02023-06-11Temperature curves for #ceramics
on 02017-03-11frits: #glass powder #materials for #ceramics
on 02017-03-11#ceramics #materials: ball #clay
on 02017-03-07different aspects of #ceramics vitrification: how to test porosity, etc. #materials
on 02017-03-07#ceramics #clay info from #ebook “Clay #materials for the self-reliant potter”. Seems like the actual recipes are missing, though.
on 02017-03-07#paper on #sintering #piezoelectric #ceramics #materials at lower temperatures using lead oxide as a sort of flux or binder
on 02017-03-02patent for sintering #glass #materials into #ceramics at only 750° by wetting 100-mesh soda-lime glass powder with PEG-8000 as a binder dissolved in isopropanol, drying it at 60°, dry-pressing it at 5000 psi (34 MPa) and then firing it. Apparently the absence of water in the process avoids foaming during firing. #patents
on 02017-02-09you can make terra cotta #ceramics #materials almost as strong as stoneware by adding frit to fill the pore spaces with glass
on 02017-01-17authoritative explanation of #ceramics sintering and how to handle #zirconia materials in particular (plasticize with 3% Veegum colloidal smectite!)
on 02017-01-17#pdf of a 1936 #paper on #refractory #ceramics #materials properties
on 02017-01-16tips on wollastonite for #ceramics #materials
on 02017-01-16#materials properties for engineering porcelain #ceramics
on 02017-01-16discussion thread on recipes for insulating #refractory bricks for #ceramics kilns. #materials
on 02017-01-14castable #refractory #materials recipes for a kiln for soda-vapor #ceramics
on 02017-01-14this dude #CNC cut bone-dry clay (for #ceramics?) with his ShopBot, a 3-axis vertical milling machine. He was going to fire it, but that was 2013, so I guess he didn’t.
on 02017-01-05This Data Clay project is about #digital-fabrication (including #3D-printing) of #ceramics made from clay. The website is shitty and full of “coming soon” pages, but there are some interesting projects anyway.
on 02017-01-05Different clay tempers for #ceramics; notes that paperclay smells terrible during firing
on 02017-01-03explanation of grog, with photos of some spectacularly grog-tempered pots. #ceramics #materials
on 02017-01-03a #paper on how plasticity of #ceramics clay #materials changes with #moisture, explaining Atterberg limits and whatnot
on 02017-01-03Mitsubishi’s 1994 metal clay patent for sintered precious metal #materials: 50% to 90% precious metal (in particles of under 200μm), 0.8% to 8% water-soluble cellulose binder (methylcellulose or ethylcellulose), 0.08% to 3% surfactant (soap; recommended polysoap or alkyl benzene sodium sulfonate), 0.1% to 3% oil, remainder water. Also mentions boiled rice or wheat flour as previous binders, but says the cellulose burns off and discolors the metal less. The oil is to keep it from sticking to your hands; suggests di-n-butyl phthalate, PEG, PVA, etc. Also says ethylene glycol enhances moldability. The cellulose gels during heating. I bet you could use this binder for non-clay #ceramics like zirconia and alumina, too; and I bet other water-soluble polysaccharides like mucilage would work.
on 02017-01-03how to join clay for #ceramics, with slip or blending.
on 02017-01-03#ceramics recipes and tips
on 02017-01-03Hey, there’s a #ceramics subreddit.
on 02017-01-037-page #pdf on #ceramics clay bodies, including A.R.T. Studio Clay Company’s catalog of clays.
on 02017-01-03#ceramics clay has water content between 19.5% and 22.5%, but the difference between soft and stiff clay is only about 1% #moisture, because solutes influence flocculation.
on 02017-01-03a miniature #ceramics kiln, 6 kg, 2.8 ℓ (160 mm × 160 mm × 115 mm), 1200 watts, max temp 1200°, #pricing AR$7551 (US$502).
on 02016-07-13stereolithography #3D printing of silicon oxycarbide, “Z. C. Eckel et al. Additive manufacturing of polymer-derived #ceramics, Science (2015). DOI: 10.1126/science.aad2688”
on 02016-01-04#3D printing #ceramics slurry through a sponge with 85% ceramic powder and 15% water and other chemicals.
on 02015-12-27Another master’s thesis #paper on #gelcasting #ceramics in broken English, this one using methacrylamide as the binder.
on 02015-08-15A #popsci article on #gelcasting #ceramics. Mentions that binder burnout takes “less than a day” as if that’s a short time!
on 02015-08-15#paper on #gelcasting #alumina and zirconia #ceramics #materials with #gelatin and polyethylene spheres to add porosity. Presumably you could use paraffin spheres too, which would be cheaper and maybe improve thixotropy. Something somewhat hydrophilic, not easily water-soluble, and burnable-out might work better still. (Lecithin?)
on 02015-08-15this chapter of “Novel Colloidal Forming of Ceramics” discusses #gelcasting #alumina #ceramics by adding hexanedioic acid to dechelate calcium ions from calcium phosphate that had been chelated by sodium hexametaphosphate and trisodium citrate, polymerizing #alginate #materials into a gel. The usual song and dance about ball mills, vacuum degassing, dissolving alginate for days, and so on, but basically their main problem was that it was gelling too damn fast, which is why they came up with this chelation nonsense to slow it down.
on 02015-08-15Galip Sarper Koçlar’s master’s thesis #paper on #gelcasting of #alumina #ceramics #materials with #gelatin and #carrageenan gum. He got best results with 5% by weight gelatin, or 1.7% by weight carrageenan, which resulted in significantly lower fired hardness but higher fired compressive strength than the gelatin, and all his trials were with 47–53% alumina, which reached 95.8% after firing at 1550°, and a bit of Dolapix dispersant. 17.5% linear shrinkage. In English, not Turkish, although it’s kind of broken English. The introduction has the best #survey of gelcasting I’ve found so far. Apparently #acrylamide (and, I guess, other similar binders) needs 30–60 minutes to gel in the mold. He also mentions existing “natural gelcasting” processes for technical ceramics using “starch, ovalbumin, chitosan, alginades [sic; should be #alginate], #gelatin, carragenan [sic] gum and [sic] etc.”, and agarose, with the disadvantage being lower green strength.
on 02015-08-15ORNL developed #gelcasting for “technical” #ceramics #materials (including #silicon-nitride) in the 1980s and 1990s, and this is a #popsci overview; apparently Mark Janney, Stephen Nunn, Claudia Walls, and Ogbemi Omatete are recognized as the inventors. Apparently the advantage over slipcasting is that shrinkage is uniform and the green casting is strong enough to be machinable. Initial experiments used methylcellulose, which gels when heated with water, as the gelifying binder, but “multifunctional acrylate” polymers (??) were the binder that made gelcasting practical, followed by water-based #acrylamide, then less-toxic methacrylamide.
on 02015-08-15discussion of deflocculating #clay #materials by adding acid in order to make them less #thixotropic for #ceramics #slipcasting.
on 02015-08-15getting #ceramics glaze slurry #materials to be #thixotropic typically involves adding a little vinegar or Epsom salt (better for slurries that contain more #clay), but some ceramics processes require deflocculating your glaze slurry or slip to avoid thixotropy. For #slipcasting you normally just partially deflocculate the slip in order to let it remain a bit thixotropic.
on 02015-08-15