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High-heat-resistance high-strength hard alloy and preparation method thereof

A cemented carbide, high-strength technology, applied in the field of high-strength cemented carbide materials and their preparation, high heat resistance, can solve the problems of impact, unfavorable alloy performance, etc., to achieve good distribution uniformity, avoid adverse effects, high temperature The effect of high rigidity

Active Publication Date: 2014-02-26
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method uses direct addition of aluminum powder, and the formation of pores and alumina is caused by the intense combination reaction of Co-Al during sintering, which has an adverse effect on the properties of the alloy.

Method used

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  • High-heat-resistance high-strength hard alloy and preparation method thereof
  • High-heat-resistance high-strength hard alloy and preparation method thereof
  • High-heat-resistance high-strength hard alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the mass percentage is 93.76%WC and 5.87%Co powder and mass percentage is 0.1%CoAl and 0.27%Co 3 W 3 After C powder is wet-milled and mixed evenly, it is spray-dried to make a mixture, and then pressed to make a compact. After liquid-phase sintering at 1500°C, the compact was cooled from the sintering temperature to 700°C at a cooling rate of 10°C / min for 40 hours of heat preservation and aging treatment; finally, it was slowly cooled to room temperature to obtain γ'(Co 3 (Al,W)) phase strengthened Co binder phase of high heat resistance, high strength cemented carbide.

[0026] After corrosion, the typical morphology of the bonding phase is as follows: figure 1 shown. figure 2 It is a comparison diagram of the appearance of the fracture after the three-point bending flexural strength test of the high heat-resistant, high-strength cemented carbide of the present invention and the ordinary WC-Co cemented carbide with the same composition at a temperatur...

Embodiment 2

[0027] Embodiment 2: the mass percentage is 93.52% WC and 5.91% Co powder and mass percentage is 0.09% Co 2 Al 9 and 0.48% Co 2 W 4 C powder After the powder is wet-milled and mixed evenly, it is spray-dried to make a mixture, and then pressed into a compact. After liquid-phase sintering at 1500°C, the compact was cooled from the sintering temperature to 800°C at a cooling rate of 30°C / min for 25 hours of heat preservation and aging treatment; finally, it was slowly cooled to room temperature to obtain γ'(Co 3 (Al,W)) phase strengthened Co binder phase of high heat resistance, high strength cemented carbide.

Embodiment 3

[0028] Embodiment 3: the mass percentage is 93.29%WC and 5.84%Co powder and mass percentage is 0.15%Co 4 Al 13 and 0.72% Co 3 W 6 C powder After the powder is wet-milled and mixed evenly, it is spray-dried to make a mixture, and then pressed into a compact. After liquid-phase sintering of the compact at 1500°C, it is then cooled from the sintering temperature to 900°C at a cooling rate of 50°C / min, and subjected to heat preservation and aging treatment for 10 hours; finally, it is slowly cooled to room temperature to obtain γ'(Co 3 (Al,W)) phase strengthened Co binder phase of high heat resistance, high strength cemented carbide.

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Abstract

The invention discloses a high-heat-resistance high-strength hard alloy using WC as a hard phase and Co3(Al,W) reinforced Co as a binding phase, wherein the mass percent of the binding phase Co-Co3(Al,W) is 6-30%. The preparation method comprises the following steps: preparing 0.09-1.43 wt% of Co-Al intermetallic compound powder, 0.27-3.39 wt% of eta-phase powder, 66.41-93.76 wt% of WC and the balance of Co powder, and mixing by wet milling; carrying out spray drying; pressing; carrying out liquid-phase sintering at 1350-1500 DEG C; quickly cooling from final sintering temperature to 700-900 DEG C at the rate of at least 10 DEG C / minute; keeping the temperature for 10 hours to perform aging treatment; and slowly cooling to room temperature to obtain the Co3(Al,W) phase reinforced Co binding phase hard alloy. The Co-Al intermetallic compound is added as the Al source, and the eta-phase is used as the W source, thereby avoiding the adverse effect on the oxygen content in the raw materials; the decomposed Al and W in the liquid-phase sintering process have high atom activity, and form a gamma'(Co3(Al,W)) phase with the liquid-phase Co; and the method has the advantages of complete reaction, high distribution uniformity, obviously higher high-temperature rigidity and high-temperature strength, simple technique and controllable composition.

Description

technical field [0001] The invention relates to a high heat resistance, high strength cemented carbide material and a preparation method thereof, in particular to a powder metallurgy technique which uses WC as the hard phase, Co 3 (Al,W)-reinforced Co binder phase for high heat-resistant, high-strength cemented carbides and methods for their preparation. Background technique [0002] Cemented carbide is widely used as cutting tools, mining tools and wear-resistant parts due to its high strength, high hardness, high wear resistance and high red hardness. The existing cemented carbide materials are mainly composed of hard phase WC and binder phase Co metal. Due to the good wettability of Co to WC, the comprehensive mechanical properties at room temperature are good, but it is prone to softening, oxidation, and high-temperature corrosion under high temperature conditions, which makes ordinary cemented carbide materials easy to wear and fail under high temperature conditions. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05
Inventor 龙坚战张忠健陆必志谢英
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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