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Preparation method of silicon nitride-doped holimium oxide ceramic

A technology of silicon nitride ceramics and holmium oxide, applied in the field of ceramic materials, can solve the problems of high cost of iridium oxide and unfavorable promotion of silicon nitride, and achieve the effects of low cost, high density and simple preparation method

Inactive Publication Date: 2012-07-11
苏州中锆新材料科技有限公司
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Problems solved by technology

However, the cost of iridium oxide is relatively high, which is unfavorable for the application and promotion of silicon nitride

Method used

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Embodiment

[0021] Holmium oxide powder is the raw material for self-synthesis, and silicon nitride powder is M11 powder produced by Starck Company in Germany. Weigh 7% holmium oxide powder and 93% silicon nitride powder respectively according to weight percentage.

[0022] The above two powders were mixed evenly in a planetary ball mill (QM-3SP2 type of Nanjing University Instrument Factory) at a speed of 300 rpm for 1.5 hours. The mixed powder was molded under a pressure of 80 MPa, and the green body was kept at 1450° C. for 16 hours in a vacuum carbon tube furnace (ZT-40-20 type from Shanghai Chenrong Electric Furnace Co., Ltd.).

[0023] The bulk density of the silicon nitride ceramics obtained in this embodiment is 3.29g / cm 3 , The flexural strength is 673Mpa.

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Abstract

The invention relates to the technical field of a ceramic material, in particular to a method for producing high-performance silicon nitride (Si3N4) by adopting holimium oxide (Ho2O3) as an additive via pressureless sintering. The component and mass percentages are as follows: 3-12% of holimium oxide and 85-97% of silicon nitride. The invention aims at overcoming disadvantages of the prior art and providing a method for producing high-performance silicon nitride by adopting holimium oxide as the additive via pressureless sintering. The method can be widely applied to preparing parts in fields such as chemical industry, machinery, metallurgy, aerospace and the like.

Description

[technical field] [0001] The invention relates to the technical field of ceramic materials, in particular to holmium oxide (Ho 2 o 3 ) as an additive for pressureless sintering to produce high-performance silicon nitride (Si 3 N 4 ) method of ceramics. [Background technique] [0002] Silicon nitride ceramics have excellent high-temperature mechanical properties and are recognized as one of the most promising high-temperature structural ceramic materials. As a covalently bonded compound, silicon nitride has a small diffusion coefficient and no melting point. It decomposes into ammonia and silicon at about 2173K, making it difficult to sinter. Common silicon nitride ceramics have reaction sintering and hot pressing sintering. Reaction sintering has poor density and poor mechanical properties. Although hot pressing sintering has high density and good mechanical properties, it is expensive and difficult to produce on a large scale. The pressureless sintering is between the ...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/63C04B35/622
Inventor 陈海
Owner 苏州中锆新材料科技有限公司
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