Ceramic crucible for calcining high-purity Nb2O5 and Ta2O5 powder
A ceramic crucible and ta2o5 technology, which is applied in crucible furnaces, lighting and heating equipment, furnace types, etc., can solve the problems of being unable to meet high-strength thermal shock resistance and pollution resistance at the same time, achieve high cost performance, ensure product quality, and improve The effect of service life
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Embodiment 1
[0019] This embodiment adopts the centrifugal grouting method to prepare CeO 2 Modified Ta 2 o 5 Ceramic crucibles, the process of which includes Ta 2 o 5 and CeO 2 Slurry preparation, slurry injection molding, drying and high-temperature firing of solid particles and high-purity Ta 2 o 5 Coating preparation, etc., the specific steps are as follows:
[0020] (1) Ta 2 o 5 and 10mol% CeO 2 Mix in an appropriate amount of deionized water, and add 3.0wt% tetramethylammonium hydroxide (TMAH) as a dispersant, place it in a nylon ball mill tank for ball milling, and after ball milling for 2 hours, add diluted ammonia water to adjust the pH=9 to 10, Continue ball milling for 15 minutes to obtain a suspension slurry with a solid content of 34%;
[0021] (2) Centrifugal grouting, the centrifuge speed is 800rpm, and the operating time is 2 minutes;
[0022] (3) Drying. After forming, the green body is first dried at room temperature for 24 hours, and then slowly heated to 60-1...
Embodiment 2
[0030] In this embodiment, gel casting molding prepares CeO 2 and Sm 2 o 3 Composite modified Ta 2 o 5 Ceramic crucible.
[0031] Specific steps are as follows:
[0032] (1) Preparation process of gel casting method: an appropriate amount of 90mol% Ta 2 o 5 , 6mol% CeO 2 and 4mol% Sm 2 o 3 Composed of mixed powder (76.5wt%), 0.3wt% organic monomer (methacrylamide), 0.2wt% crosslinking agent (N, N-methylene bisacrylamide), 2.5wt% dispersant ( Temperature-60) and 20.3wt% water are mixed evenly, are prepared into the ceramic slurry of high solid phase volume fraction, and add initiator and catalyst (0.1wt% ammonium persulfate), then inject the slurry in the mould, make the slurry In-situ solidification forms the green crucible body.
[0033] (2) Drying. After forming, the green body is first dried at room temperature for 24 hours, and then dried at 80° C. for 4 hours using a microwave dryer.
[0034] (3) Firing at high temperature. After drying, the green body is heat...
Embodiment 3
[0041] This embodiment adopts the centrifugal grouting method to prepare CeO 2 Modified Nb 2 o 5 Ceramic crucible, its process step is similar to embodiment 1:
[0042] (1) Nb with a molar percentage of 95.5mol% 2 o 5 and 4.5 mol% CeO 2 Mix in an appropriate amount of deionized water, and add 2.6wt% tetramethylammonium hydroxide (TMAH) as a dispersant, place it in a nylon ball mill jar for ball milling, and after ball milling for 15 minutes, add diluted ammonia water to adjust the pH to about 10, continue Ball milled for 15 minutes to obtain a suspension slurry with a solid content of 30%.
[0043] (2) Centrifugal grouting, the rotating speed of the centrifuge is 1000rpm, and the operation time is 2 minutes.
[0044] (3) Drying. After forming, the green body is first dried at room temperature for 24 hours, and then slowly heated to 120° C. for 12 hours.
[0045] (4) Firing at high temperature. After drying, the green body is heated to 400°C at a rate of 2°C / min and kept...
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