Preparation of wc-ni micro parts, cutting tools and their preparation methods based on multi-physics field activation sintering

Abstract

The invention discloses a WC-Ni mini-type component prepared based on multi-physics field activated sintering and a preparing method of the WC-Ni mini-type component. The method comprises the steps that WC powder and Ni powder with the corresponding mass are mixed through a wet grinding method, the mixed powder is arranged in a die after weighing, the die filled with the WC-Ni mixed powder is electrified with alternating current to be rapidly heated under the conditions that the vacuum degree is smaller than or equal to 0.01 Pa and 20-100 MPa acting force exerted on the two ends of the die; the electric field constant-temperature sintering method or the electric heating fluctuation method can be adopted in the heating technology; the WC-Ni mixed powder is cooled to the room temperature after being formed in the die, and finally the component is taken out after outage. According to the WC-Ni mini-type component and the preparing method, the technological process is simplified, the forming process is easy to control, a grain inhibitor does not need to be added in the sintering process, products are free of pollution, the sintering time is shortened, the sintering temperature is reduced, and the product quality is improved.

Description

technical field [0001] The invention relates to a preparation of WC-Ni micro parts based on multi-physics field activation sintering and a preparation method thereof, belonging to the technical field of rapid sintering preparation of WC-Ni micro parts. Background technique [0002] WC–Co cemented carbide is widely used in various cutting tools, impact-resistant abrasives and wear-resistant parts due to its excellent hardness, wear resistance, good fracture strength and toughness. However, as an expensive and scarce metal, Co has extremely limited global reserves, is expensive, and has poor corrosion resistance and oxidation resistance in acidic environments. Therefore, the use of cobalt as a binder is limited to a certain extent. [0003] Ni shows good wettability to WC, and has better oxidation resistance and corrosion resistance than Co, especially after alloying, it can make the cemented carbide more excellent, and it also has no carbon content at low carbon content. Adv...

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Problems solved by technology

This method also needs to add grain inhibitors due to the long sintering time and high sintering temperature, which leads to large energy consumption and serious product pollution.

[0007] The inventor of the present invention intends to aim at the current situation that there are few reports on the preparation method of WC-Ni micro parts; Due to defects such as low product purity, a method for preparing WC-Ni micro parts based on multi-physics field activation sintering is provided