Method for preparing anti-ablation hafnium boride (HfB2) powder
An anti-ablation, hafnium boride technology, applied in boron/boride, metal boride and other directions, can solve the problems of many powder impurities, long process cycle, expensive raw materials, etc., to increase the reaction activity, simple operation and cost. low cost effect
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[0018] Example 1:
[0019] Step 1: Add hafnium chloride (HfCl 4 ), boric acid (H 3 BO 3 ), phenolic resin (residual carbon rate is 60%) respectively dissolved in alcohol solution, among them, HfCl 4 , H 3 BO 3 The molar ratio of phenolic resin to phenolic resin is 1:2:4, and the solution is stirred uniformly with a magnetic stirrer for use;
[0020] Step 2: Mix the three solutions uniformly under the stirring of a magnetic stirrer, and use concentrated ammonia (NH 3 ·H 2 O) Adjust the pH of the solution to 4-4.5, and make a wet gel after thorough stirring;
[0021] Step 3: Dry the prepared three kinds of wet gels in an oven at 80°C for 24 hours, and then ball mill them with a planetary ball mill for 24 hours, set the speed to 250r / min, and set the forward and reverse commutation cycle to 20min;
[0022] Step 4: Under the protection of 400~600ml / min Ar gas, the powder is heated in a graphitization furnace at a heating rate of 5~10℃ / min to 1800℃ for 1h, then the power is cut off and the ...
Example Embodiment
[0023] Example 2:
[0024] Step 1: Add hafnium chloride (HfCl 4 ), boric acid (H 3 BO 3 ), phenolic resin (residual carbon rate is 60%) respectively dissolved in alcohol solution, among them, HfCl 4 , H 3 BO 3 The molar ratio of phenolic resin to phenolic resin is 1:4:8, and the solution is stirred uniformly with a magnetic stirrer for use;
[0025] Step 2: Mix the three solutions uniformly under the stirring of a magnetic stirrer, and use concentrated ammonia (NH 3 ·H 2 O) Adjust the pH of the solution to 4-4.5, and make a wet gel after thorough stirring;
[0026] Step 3: Dry the prepared three kinds of wet gels in an oven at 80℃ for 24 hours, and then ball mill them with a planetary ball mill for 24 hours, set the speed to 250r / min, and set the positive and negative commutation cycle to 20min
[0027] Step 4: Under the protection of 400~600ml / min Ar gas, the powder is heated in a graphitization furnace at a heating rate of 5~10℃ / min to 1800℃ for 1h, then the power is cut off and the ...
Example Embodiment
[0028] Example 3:
[0029] Step 1: Add hafnium chloride (HfCl 4 ), boric acid (H 3 BO 3 ), phenolic resin (residual carbon rate is 60%) respectively dissolved in alcohol solution, among them, HfCl 4 , H 3 BO 3 The molar ratio of phenolic resin to phenolic resin is 1:6:12, and the solution is stirred uniformly with a magnetic stirrer for use;
[0030] Step 2: Mix the three solutions uniformly under the stirring of a magnetic stirrer, and use concentrated ammonia (NH 3 ·H 2 O) Adjust the pH of the solution to 4-4.5, and make a wet gel after fully stirring;
[0031] Step 3: Dry the prepared three kinds of wet gels in an oven at 80°C for 24 hours, and then ball mill them with a planetary ball mill for 24 hours, set the speed to 250r / min, and set the forward and reverse commutation cycle to 20min;
[0032] Step 4: Under the protection of 400~600ml / min Ar gas, the powder is heated in a graphitization furnace at a heating rate of 5~10℃ / min to 1800℃ for 1h, then the power is cut off and the te...
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