Mullite-based ceramic material and preparation method thereof

[0030] Example 1

[0031] Preparation of mullite seeds, including the following steps:

[0032] According to the ratio of orthosilicate, aluminum nitrate and ethanol of 3 mol: 2 mol: 1 L, 0.3 mol orthosilicate and 0.2 mol of nitrate were mixed and added to 100 ml of ethanol, and 1 mol / L was added dropwise. The hydrochloric acid solution to a pH of 2, reacted at 60 ° C for 3 h, resulting in silicon aluminum-soluble, add 4 mol / L of ammonia water to a silicon aluminum aluminum, reacting 10 h at 60 ° C, resulting silicon Aluminum gel, after drying the silica gel at 70 ° C, calcined at 1000 ° C, cooling, and the diameter of 52-55 nm was obtained, and the length of 1.5-1.7 μm was produced.

[0033] Preparation of phosphate binders, including the following steps:

[0034] Step A1, will Al (OH) 3 Join the mass fraction of H 3 PO 4 Al (OH) 3 With h 3 PO 4 The molar ratio of the solute in the solution was 5: 4 to obtain a mixed liquid, and the mixture was warmed to 85 ° C and stirred f

[0041] Example 2

[0042] Preparation of mullite seeds, including the following steps:

[0043] According to the ratio of orthosilicate, aluminum nitrate and ethanol of 3 mol: 2 mol: 1 L, 0.3 mol orthosilicate and 0.2 mol of nitrate were mixed and added to 100 ml of ethanol, and 1 mol / L was added dropwise. The hydrochloric acid solution is 2, reacted at 60 ° C for 4 h, resulting in silicon aluminum-soluil, add 4 mol / L of ammonia water to a silica aluminumol, reacts 11h at 60 ° C, resulting silicon Aluminum gel, after drying the silica gel at 80 ° C, calcined at 1200 ° C, cooled, and the diameter of 58-63 nm was produced, the length of 1.6-1.8 μm was produced.

[0044] Preparation of phosphate binders, including the following steps:

[0045] Step A1, will Al (OH) 3 Join the mass fraction of H 3 PO 4 Al (OH) 3 With h 3 PO 4 The molar ratio of the solute in the solution was 5: 4 to obtain a mixed liquid, and the mixture was warmed to 85 ° C and stirred for 3 h, resulting in a vi

[0052] Example 3

[0053] Preparation of mullite seeds, including the following steps:

[0054] According to the ratio of orthosilicate, aluminum nitrate and ethanol of 3 mol: 2 mol: 1 L, 0.3 mol orthosilicate and 0.2 mol of nitrate were mixed and added to 100 ml of ethanol, and 1 mol / L was added dropwise. The hydrochloric acid solution is 2, reacted at 60 ° C for 5 h, and a silicon aluminum-soluble is obtained, and 4 mol / L is added to the silicone aluminum sol. Aluminum gel, after drying the silica gel at 90 ° C, calcined at 1300 ° C, and then cooled, the diameter of 62-69 nm, the length of 1.7-2.0 μm was produced.

[0055] Preparation of phosphate binders, including the following steps:

[0056] Step A1, will Al (OH) 3 Join the mass fraction of H 3 PO 4 Al (OH) 3 With h 3 PO 4 The molar ratio of the solute in the solution was 5: 4, resulting in a mixture, and the mixture was warmed to 85 ° C and stirred for 4 h, resulting in a viscous liquid;

[0057] Step A2, according to