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Pressureless production process for erbium and lanthanum doped silicon nitride

A production process, a technology of silicon nitride, 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: 2012-11-14
KUNSHAN ZHIJI MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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] Erbium oxide and lanthanum oxide are from Ganzhou Jiarun New Material Co., Ltd., and silicon nitride powder is M11 powder produced by German Starck. 3% of erbium oxide, 5% of lanthanum oxide and 92% of silicon nitride powder were respectively weighed according to weight percentage.

[0022] The above two powders were mixed uniformly 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 3.41g / cm 3 , The flexural strength is 623Mpa.

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Abstract

The invention relates to the technical field of ceramic materials and specifically to a method for preparing a high performance silicon nitride (Si3N4) ceramic through pressureless sintering by using erbium oxide and lanthanum oxide as additives. The ceramic comprises the following components expressed in mass percent: 3 to 7% of erbium oxide, 5 to 8% of lanthanum oxide and 85 to 92% of silicon nitride. The objective of the invention is to provide the method for preparing the high performance silicon nitride ceramic through pressureless sintering by using erbium oxide and lanthanum oxide as the additives to overcome disadvantages in the prior art, and the prepared ceramic can be extensively used for preparation of components and parts used in fields like the chemistry industry, machinery, metallurgy and the aerospace industry.

Description

[technical field] [0001] The invention relates to the technical field of ceramic materials, in particular to a method for producing high-performance silicon nitride ceramics through pressureless sintering of erbium oxide and lanthanum oxide as additives. [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 tw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/63C04B35/622
Inventor 丁勤
Owner KUNSHAN ZHIJI MATERIAL TECH
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