Fused refractory
US4158569A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1978 |
| Grant date | Jun 19, 1979 |
| Priority date | — |
| Expiry date | Jul 10, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/42
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Dense fused cast product and fused grain product of material whose microstructure consists essentially of at least 70 volume % chrome-containing corundum solid solution crystal phase, at least about 5 volume % oxidic secondary crystal phases mainly comprising chrome-containing alkaline earth hexaluminate solid solution, and less than 10 volume % metal phase. Analytical composition of material, by weight, consists essentially of at least 90% Al.sub.2 O.sub.3 +Cr.sub.2 O.sub.3, 20-60% Cr.sub.2 O.sub.3, 1-4% MO where M is Ca, Ba, Sr, Mg, Fe and mixtures thereof, 0.4-3.5% CaO, BaO, SrO and mixtures thereof, not greater than 3% MgO, not greater than 3.5% FeO, <5% SiO.sub.2, up to 0.5% fluorine, <1.5% R.sub.2 O wherein R is Li, Na, K, Rb, Cs and mixtures thereof, up to 2% TiO.sub.2 and up to 3% ZrO.sub.2. Resistant to corrosion by soda-lime and borosilicate glasses. Notable electrical resistivity with SiO.sub.2 <1% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.