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Preparation method for h-BN/WB2 machinable ceramic

A technology of WB2 and ceramics, which is applied in the field of h-BN/WB2 machinable ceramics, which can solve the problems of low bending strength and achieve the effects of high strength, uniform microstructure and excellent oxidation resistance

Inactive Publication Date: 2015-03-18
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

Experimental program
Comparison scheme
Effect test

Embodiment 1

Embodiment 2

Embodiment 3

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PUM

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Abstract

A preparation method for h-BN / WB2 machinable ceramic is characterized by: employing h-BN coated WB2 ceramic powder, performing cold isostatic compaction, performing hot pressing, and sintering to form h-BN / WB2 machinable ceramic; mixing boric acid and urea (according to a ratio) with ethanol in a sealed container to prepare an esterification solution; adding WB2 ceramic powder into the esterification solution to prepare a ceramic slurry; employing a spray comminutor to prepare a coating WB2 powder from the above ceramic slurry, nitrogenizing the above coating WB2 powder to obtain h-BN coating WB2 ceramic powder; performing isostatic compaction on h-BN coating WB2 ceramic powder to prepare sheet-shaped bodies; and performing hot pressing in nitrogen atmosphere, and sintering to prepare h-BN / WB2 machinable ceramic. The prepared machniable ceramic is uniform in h-BN phase distribution, controllable in h-BN phase content, and excellent in machinable property, mechanical property and thermal property.

Description

technical field [0001] The present invention relates to a kind of h-BN / WB 2 A machinable ceramic belongs 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 mort...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/628C04B35/622
Inventor 唐竹兴
Owner SHANDONG UNIV OF TECH