Detail of "7790-76-3"

Reference

Solid state reactions of calcium phosphate with aluminosilicates

Solid state reactions of calcium phosphate with aluminosilicates. Ichiko, Tadatoshi (Narumi China Corp., Nagoya, Japan). Yogyo Kyokai Shi, 85(8), 397-403 (Japanese) 1977. CODEN: YGKSA4. DOCUMENT TYPE: Journal CA Section: 57 (Ceramics) Section cross-reference(s): 67 The solid state reactions of Ca phosphates with aluminosilicates were investigated to collect fundamental data on the mechanism of vitrification occurring in bone china bodies during firing. Ca2P2O7 [7790-76-3] which was a decompn. product of CaHPO4.cntdot.2H2O, released a part of its P2O5 component, which diffusd into the aluminosilicate layer, while the remainder was transformed into Ca3(PO4)2 [7758-87-4]. Hydroxyapatite [1306-06-5] released a part of its CaO component, which diffused into aluminosilicates, while the remainder also was transformed into Ca3(PO4)2. The Ca3(PO4)2 did not react with aluminosilicates in a solid state reaction. The diffusion might be affected appreciably by the crystal structure of host minerals and the clay minerals were more reactive than other aluminosilicates. In the solid state reactions, the P2O5 and CaO components. preferentially diffused into the clay minerals and the former facilitated melting and the latter reacted with the clay minerals and formed anorthite [1302-54-1]. Kaolinite [1318-74-7] was much more reactive than the other clay minerals. When anorthite was formed, pyrophyllite [12269-78-2] and sericite [12174-53-7] were more reactive with the CaO component than kaolinite.

Reaction ammonium hydrogen phosphate with calcium carbonate during heating

Reaction ammonium hydrogen phosphate with calcium carbonate during heating. Millere, I.; Bielis, I.; Krastina, G. L. (USSR). Uch. Zap., Latv. Gos. Univ., 203, 115-23 (Russian) 1974. CODEN: UZLUA2. DOCUMENT TYPE: Journal CA Section: 57 (Ceramics) Section cross-reference(s): 67 CP (NH4)2HPO4 and CaCO3 were reacted at 190-850.degree.. The CaO content (related to P2O5) was 10-90%. A weak endothermic effect was obsd. on all DTA curves at 110-120.degree. which was caused by a gradual detaching of 1 mol NH4. In the reaction, CaHPO4 [7757-93-9] and Ca(HP2O6)2 [64540-03-0] formed at 190.degree. and Ca(PO3)2 [13477-39-9] formed at 350-500.degree.. The mixts. contg. 60-90% CaO and heated to 620.degree. formed .beta.-Ca2P2O7 [7790-76-3]. In mixts. contg. .ltoreq.50% CaO, Ca(PO3)2 was retained even at .ltoreq. 850.degree., while in the mixts. contg. 70-90% CaO, the .beta.-Ca3(PO4)2 [7758-87-4] was formed.