review #paper on silica-alumina #refractory ceramic #materials, including particularly mullite
on 02017-05-19technical data on insulating firebrick #refractory #materials has bricks that are good up to 1260° to 1649°, specific gravity from 0.58 to 1.03, modulus of rupture from 0.85 to 1.52 MPa, crush strength from 1.8 to 2.5 MPa, thermal conductivity from 0.18 to 0.44 W/mK, varying significantly with temperature. Less dense bricks are less conductive, weaker, and, surprisingly, resist lower temperatures — the last presumably because of a higher silica-to-alumina ratio.
on 02017-05-19technical data on insulating firebrick #refractory #materials that I can’t be bothered to summarize here because it’s all in Imperial units
on 02017-05-19#pdf of a 1936 #paper on #refractory #ceramics #materials properties
on 02017-01-16an excerpt from “The Self-Reliant Potter”, “a ceramic book specifically to suit conditions in developing countries originated from my [Henrik Norsker’s] personal experience and associated problems whilst I was struggling to set up modern pottery production in a Tanzanian village ten years ago [before 1985]” on #refractory #materials and techniques. #ebook
on 02017-01-14more #refractory #materials recipes
on 02017-01-14a castable #refractory recipe that recommends using calcium aluminate cement rather than portland. #materials
on 02017-01-14another discussion thread on recipes for castable #refractory #materials
on 02017-01-14discussion thread on recipes for insulating #refractory bricks for #ceramics kilns. #materials
on 02017-01-14a recipe for castable #refractory made with wollastonite and phosphoric acid, generating calcium phosphate (hydroxyapatite, like bone) and amorphous silica. Supposedly doesn’t melt until 1670°; the phosphate acts as a cement. #materials
on 02017-01-14castable #refractory #materials recipes for a kiln for soda-vapor #ceramics
on 02017-01-14“Homesteading and permaculture, all the time”. Forum thread about castable #refractory formulations for rocket stoves and whatnot. #materials #hardware
on 02016-06-30No, wait, "forsterite" (an #olivine; Mohs hardness 7! Gemstone peridot!) is magnesium silicate, Mg₂SiO₄. I thought that was talc? Apparently talc is hydrated, so I’m guessing that precipitating #waterglass with magnesium is going to give you something more like talc than like forsterite, which also has a 2:1 Mg:Si ratio, compared to talc’s 3:4 Mg:Si ratio; so baking out the water probably wouldn’t be enough. #Refractory #materials: doesn’t melt until 1900°! (And iron ions, but only iron(II) ions, can replace the magnesium in any concentration.) But wait! There’s #enstatite! #materials #minerals
on 02015-08-30A #refractory #ceramic (1850° or so), typically sintered with spark plasma sintering. Gelbart’s #steam-engine uses it for the intake valve because it's more resistant to being pitted by the steam than steel is. #materials
on 02015-08-13