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Preparation method of h-BN/WC machinable ceramic

A ceramic, h-bn technology, applied in the field of h-BN/WC machinable ceramics, can solve the problem of low bending strength, achieve high strength, excellent oxidation resistance, and high overall reliability

Inactive Publication Date: 2013-03-27
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the machinable ceramic materials prepared by the usual hybrid and chemical h-BN coating technology have low flexural strength

Method used

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Examples

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Embodiment 1

Embodiment 2

Embodiment 3

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Abstract

The invention relates to a preparation method of an h-BN / WC machinable ceramic. The method is characterized in that the h-BN / WC machinable ceramic is obtained via hot-pressing and sintering after a cold isostatic pressing process by using h-BN coated WC ceramic powder. The method comprises the steps of mixing boric acid, urea and ethanol in a sealed container according to a proportion to form an esterification solution; adding WC ceramic powder in the esterification solution to form ceramic slurry; making the ceramic slurry into coated WC powder by using a spray granulator; nitriding the coated WC powder to obtain the h-BN coated WC ceramic powder; pressing the h-BN coated WC ceramic powder into sheet green bodies via an isostatic pressing process; hot-pressing the sheet green bodies under a nitrogen atmosphere; and sintering into the h-BN / WC machinable ceramic. The machinable ceramic obtained by the method has uniform h-BN phase distribution, controllable content, good machinable property, good mechanical properties and excellent thermal properties.

Description

technical field [0001] The invention relates to h-BN / WC machinable ceramics, belonging to the technical field of ceramic preparation. Background technique [0002] Ceramic materials have many excellent properties. However, due to the high hardness of ceramic materials, when preparing precision-sized ceramic parts, they can only be ground by diamond abrasive grinding wheels, and the manufacturing cost is very high. Therefore, people have been looking for a method that can not only meet the requirements of basic mechanical properties, but also obtain precision-sized ceramic parts by machining. In the 1990s, Japanese scholar Niihara and others adopted Si 3 N 4 Particle-coated h-BN prepared high-strength machinable ceramic parts, which opened up a new way for the preparation of high-performance machinable ceramic parts; in 2002, Li Yongli et al. 2 o 3 The analytical reagent CO(N 2 ) 2 and H 3 BO 3 Mixed at a molar ratio of 1:4, fully ground in a mortar, and high-purity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/583C04B35/56C04B35/622
Inventor 唐竹兴
Owner SHANDONG UNIV OF TECH