| 摘要 |
1341647 Refractory cements L'ELECTROREFRACTAIRE SA 7 Aug 1972 [18 Oct 1971] 36822/72 Headings C1H and C1J A refractory binder and concrete based on phosphoric acid and an aluminium compound reactable with H 3 Pe 3 to form AlPe 3 contains a solid support having a specific area of at least 5000 cms./g. The support preferably contains at least 45% Al 2 O 3 ΠZrO 2 and SiO 2 Al hydroxychloride is the specified compound. Urea and boric acid are optionals. |
