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Production of toughened and reinforced tungsten carbide composite material with non-stablized yttrium jargonia

A tungsten carbide composite material, an unsteady state technology, applied in the field of powder metallurgy industry, can solve problems such as rust spots, achieve the effects of improved bending strength and impact toughness, obvious refinement, and reasonable internal tissue composition

Inactive Publication Date: 2006-03-15
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

However, the main problem of cemented carbide products with iron as the main component of the binder phase is that it is difficult to obtain the ideal WC+γ two-phase structure, and there is always a harmful third phase, that is, either complex carbides (M 6 C), or the graphite phase coexists, and there are also the following problems in addition: when it is stored, it is corroded by air and humid atmosphere to produce rust spots; research and production practices have confirmed that: Fe powder and Ni powder "aggregate" phenomenon in the wet grinding process. Serious, the reason is related to the low hardness and good plasticity of Fe powder and Ni powder; iron and carbon can generate relatively stable Fe 3 C, iron is more likely to form Me x Fe x C y Brittle compound, which increases the brittleness of the alloy and reduces the strength

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  • Production of toughened and reinforced tungsten carbide composite material with non-stablized yttrium jargonia

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Embodiment Construction

[0015] 1) The average particle size of raw material WC powder is 4.03 μm, the average particle size of Co powder is 1.63 μm, ZrO 2 Powder average particle size (D 50 ) is 0.65 μm. Formula weighing WC powder 29Kg, Co powder 7Kg and ZrO 2 Powder 4Kg, WC powder, Co powder and ZrO 2 The powder was mixed in a ball mill for 40 hours by means of wet ball milling. Then, adopt vacuum sintering process (vacuum degree is 300 Pa): heating from room temperature to the end of sintering for 14 hours, the final sintering temperature is 1380° C., and the holding time is 45 minutes. After sintering in a vacuum furnace, a densification sintering process is carried out with hot isostatic pressing equipment, using N 2 Air is used as the pressurized medium, and the pressurization is 3.5MPa.

[0016] 2) The average particle size of raw material WC powder is 4.03 μm, the average particle size of Co powder is 1.63 μm, ZrO 2 Powder average particle size (D 50 ) is 0.65 μm. Formula weighing WC p...

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Abstract

The method is to prepare the tungsten carbide compound material of the non-steady state yttrium zircite. First to match the powdeZrO21-8wt%, powderCo10-20wt% and the residue is powderWC; then to mix the mixture in the globe mill for 35-50h; last to get the compound metal ceramic material by the chill-pressing, vacuum sinter and hot isostatic press. The material has the good wearing and bending resistances.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy industry, and in particular provides a preparation method of an unsteady yttrium zirconia toughened and reinforced tungsten carbide composite material. Background technique [0002] Cemented carbide has the characteristics of high hardness and high wear resistance. Its performance is between ceramics and high-speed steel. It is an important tool and mold material. With the development of high-tech industries, cemented carbide products have a wider range of applications. Application prospect and greater market demand. Generally, while improving the toughness of cemented carbide, it will significantly reduce the hardness and wear resistance of cemented carbide. We utilize partially stabilized zirconia t-ZrO 2 →m-ZrO 2 The characteristics of phase transformation toughened oxide ceramics were studied to improve the toughness and wear resistance of cemented carbide. [0003] Zirconia can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/02B22F3/16B22F9/04
Inventor 韩静涛安林
Owner UNIV OF SCI & TECH BEIJING
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