Dense ceramic gelcasting method based on low-concentration agarose and low-solid-content slurry
A technology of gel injection molding and low solid content, applied in the field of ceramic materials, can solve the problems of high viscosity of ceramic slurry, lower density of ceramic products, and inability to discharge air bubbles by itself, achieving low solid content, low cost, Excellent effect
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Embodiment 1
[0016] Measure 16.8ml of distilled water and add it to the ball mill jar, and add a total of 26g of zirconia powder (theoretical density is 6.1g / cm 3 , particle diameter is 1um), 0.221g agarose powder and mass fraction are 0.6% ammonium citrate (about 0.156g) one-time join in the ball mill jar and stir evenly, make solid phase volume fraction be 20.2%, agarose concentration It is 1.3wt% mixed suspension slurry. The pH of the obtained mixed slurry was adjusted to 10 with ammonia water, and after ball milling for 20 hours, it was shaken in vacuum at room temperature for 30 minutes to defoam. After the vacuum defoaming is completed, the mixed slurry is injected into a non-porous glass mold at room temperature, and then the mold is placed in an environment of 110°C and fully heated for 2 hours. During this process, the mixed slurry does not need to be stirred. After it is cooled to room temperature and fully formed, it is dried in multiple steps to obtain a zirconia green body wi...
Embodiment 2
[0018] Measure 16.8ml of distilled water and add it to the ball mill jar, and add a total of 43.9g of zirconia powder (theoretical density is 6.1g / cm 3 , particle diameter is 1um), 0.431g agarose powder and mass fraction are 1% ammonium citrate (about 0.439g) one-time join in the ball mill jar and stir evenly, make solid phase volume fraction be 30%, agarose concentration It is 2.5wt% mixed suspension slurry. The pH of the obtained mixed slurry was adjusted to 10 with urea, and after ball milling for 32 hours, vacuum shaking was performed at room temperature for 30 minutes to defoam. After the vacuum defoaming is completed, the mixed slurry is injected into a non-porous metal mold at room temperature, and then the mold is fully heated at 110°C for 3 hours, and the mixed slurry does not need to be stirred during this process. After it is cooled to room temperature and fully shaped, it is dried in multiple steps to obtain a zirconia green body with high strength, and finally si...
Embodiment 3
[0020] Measure 34.3ml of distilled water and add it to the ball mill jar, and add a total of 35.2g of alumina powder (theoretical density is 3.97g / cm 3 ), 0.5g of agarose powder and 1% ammonium citrate (about 0.352g) by mass fraction were added to the ball mill and stirred evenly to make a solid phase volume fraction of 20.5% and agarose solubility of 1.4wt%. alumina ceramic slurry. The pH of the obtained mixed slurry was adjusted to 10 with urea, and after ball milling for 24 hours, vacuum shaking was performed at room temperature for 30 minutes to defoam. After the vacuum defoaming is completed, the mixed slurry is injected into the non-porous polytetrafluoroethylene mold at room temperature, and then the mold is placed in an environment of 110°C and fully heated for 2 hours. During this process, the mixed slurry does not need to be stirred. After it is cooled to room temperature and fully formed, it is dried in multiple steps to obtain a high-strength alumina green body, a...
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