Isostatic Pressing Bags for Alumina Crucible

Isostatic Pressing Bags for Alumina Crucible

The higher the fineness and activity of alumina powder, the greater the content of sintering aids in the green body, and the lower the sintering temperature of alumina ceramics. Under the same molding pressure, the strength of the sample formed by isostatic pressing is 60~80% higher than that of the sample formed by compression molding at different temperatures, but there is no obvious difference in the densification degree of the sample. Experiments show that the molding conditions of alumina ceramic crucible are: isostatic pressing at 50~100MPa. At a lower firing temperature, the densification of the green body can be promoted by extending the holding time. However, at a higher firing temperature, it is not advisable to hold the body for a long time, otherwise the rapid growth of the grains will be detrimental to densification. change. Controlling the temperature rise rate during sintering of alumina ceramics is beneficial to the densification of alumina ceramics.

The function of alumina ceramic crucible: When there is a solid to be heated with a high fire, a crucible must be used. When the crucible is in use, the crucible cover is usually placed diagonally on the crucible to prevent the heated object from jumping out and to allow air to freely enter and exit for possible oxidation reactions. Because the bottom of the crucible is very small, it generally needs to be placed on a clay triangle to be directly heated by fire. The crucible can be placed upright or tilted on the iron tripod. It can be placed by yourself according to the needs of the experiment. Do not place the crucible on a cold metal table immediately after heating to avoid cracking due to rapid cooling. Do not place it directly on a wooden tabletop to avoid burning the tabletop or causing a fire. The correct method is to leave it on an iron tripod to cool naturally, or place it on an asbestos net and let it cool slowly.

Four characteristics of alumina crucible:

1. High thermal conductivity: The heat transfer speed between the sample and the crucible is fast to ensure that there is a very small temperature difference between the two and the temperature distribution is uniform.

2. Stable structural performance: High-purity powder is combined with a precisely controlled high-temperature sintering process to form a dense and uniform microcrystalline structure, ensuring that there are no peaks during use and that physical and chemical reactions with the analyzed samples are unlikely to occur.

3. Ultra-high temperature stability and wide operating temperature range, the working temperature can reach 1750 degrees.

4. High reusability: washed with water or washed with 10% hydrochloric acid and dried, it can be used repeatedly without affecting the experimental results.

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