Several Issues to Pay Attention to in Injection Molding of Zirconia Ceramics

Several Issues to Pay Attention to in Injection Molding of Zirconia Ceramics

If the quality requirements of zirconia ceramic products are high, such as smoothness, dimensional tolerance, etc., after sintering, zirconia ceramic products need to undergo precision machining. Due to the high hardness of zirconia ceramic Hardness, it is necessary to finish it with harder grinding and polishing brick materials. Of course, the raw materials of zirconia ceramics are also very important, so how many aspects should injection molding technology pay special attention to?

Zirconia ceramic

1. Zirconia Ceramic Injection Molding Degreasing Integrity

This process, also known as removing the adhesive, usually heats up at a rate of 3-5 ℃/b for about 5-10 days. However, when carried out in a protective atmosphere with a pressure of 0.5MPa, the degreasing can be completed within 40 hours.

2. Injection molding and sintering process of zirconia ceramics

The thermal and other parameters can be determined based on the type of ceramic. The linear shrinkage rate during sintering is about 15-20%, and work with complex shapes or thick walls is prone to cracking during sintering, and attention should be paid to preventing it.

3. Flowability of Zirconia Ceramic Injection Molding Raw Materials

The ceramic particles used in injection molding are generally composed of 80-90% (important ratio, the same below) powder and 10-20% binder. The binder is removed during the degreasing process, so the minimum amount of addition is appropriate. However, it should be noted that insufficient addition will affect the forming effect. In addition, the fluidity of ceramic particles deteriorates as the particle size decreases and the shape deviates from the spherical shape. Therefore, the liquidity should be tested using the simplest possible method.

4. Defects generated by injection molding conditions of zirconia ceramics

If the forming conditions are not correct, various defects can occur. The most crucial one is the fusion welding line, which is prone to defects if the formed form has through holes or blind holes. Therefore, it is necessary to pay attention to the design of the mold, especially the type, position, size, and number of openings. At the same time, attention should be paid to the balance between injection temperature and speed in injection molding

Zirconia ceramic

1. Zirconia Ceramic Injection Molding Degreasing Integrity

This process, also known as removing the adhesive, usually heats up at a rate of 3-5 ℃/b for about 5-10 days. However, when carried out in a protective atmosphere with a pressure of 0.5MPa, the degreasing can be completed within 40 hours.

2. Injection molding and sintering process of zirconia ceramics

The thermal and other parameters can be determined based on the type of ceramic. The linear shrinkage rate during sintering is about 15-20%, and work with complex shapes or thick walls is prone to cracking during sintering, and attention should be paid to preventing it.

3. Flowability of Zirconia Ceramic Injection Molding Raw Materials

The ceramic particles used in injection molding are generally composed of 80-90% (important ratio, the same below) powder and 10-20% binder. The binder is removed during the degreasing process, so the minimum amount of addition is appropriate. However, it should be noted that insufficient addition will affect the forming effect. In addition, the fluidity of ceramic particles deteriorates as the particle size decreases and the shape deviates from the spherical shape. Therefore, the liquidity should be tested using the simplest possible method.

4. Defects generated by injection molding conditions of zirconia ceramics

If the forming conditions are not correct, various defects can occur. The most crucial one is the fusion welding line, which is prone to defects if the formed form has through holes or blind holes. Therefore, it is necessary to pay attention to the design of the mold, especially the type, position, size, and number of openings. At the same time, attention should be paid to the balance between injection temperature and speed in injection molding

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