High-temperature-resistant and wear-resistant hard alloy and preparation method thereof

A cemented carbide and high temperature resistant technology, applied in the field of cemented carbide materials and their preparation, can solve the problems of high brittleness and insufficient oxidation resistance of NiAl alloys, and achieve the effects of high brittleness, avoiding heat accumulation and preventing self-propagating reactions.

Active Publication Date: 2013-03-20
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relative to NiAl, Ni 3 The melting point of Al (1395°C) is low, and the oxidation resistance is insufficient
At higher temperatures, the wear resistance of NiAl is much better than that of Ni 3 Al, but NiAl alloys are more brittle

Method used

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  • High-temperature-resistant and wear-resistant hard alloy and preparation method thereof
  • High-temperature-resistant and wear-resistant hard alloy and preparation method thereof
  • High-temperature-resistant and wear-resistant hard alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 27-31）

[0014] As a further improvement, the hard phase is WC and TiC, and the mass percentage of WC and TiC is 3.18-1.59:1; the binder phase is NiAl alloyed Co and Fe, and the volume percentage is 25%-40%.

[0015] Simultaneously, the present invention also provides the preparation method of this cemented carbide, comprises the following steps successively:

[0016] (1) According to the composition ratio of nickel-aluminum intermetallic compound Ni-50at.%Al, mix nickel powder, aluminum powder and carbide powder evenly; the mass percentage of nickel powder and aluminum powder in the mixed powder is 0.03%~ 21.04%, the balance is carbide powder;

[0017] (2) Place the above mixed powder in a graphite container and pave it with a thickness of ≤50mm. In a non-oxidizing atmosphere, heat it to 660°C~1300°C at a heating rate of ≤2°C / min, keep it warm for more than 1 hour, and then cool it naturally to obtain a mixture of carbide and nickel-aluminum intermetallic compound NiAl; grind the mix...

Embodiment 1

[0028] Embodiment 1: According to figure 1In the process shown, according to the composition ratio of Ni-50at.%Al, the nickel powder and aluminum powder with a mass percentage of 0.03% are mixed evenly with the remaining WC powder (99.97%); the above mixed powder is placed in a graphite container Pave the thickness of 50 mm, in a non-oxidizing atmosphere, heat up to 660 °C at a heating rate of 2 °C / min, keep it for 4 hours, and then cool naturally to obtain a mixture of WC and nickel-aluminum intermetallic compound NiAl; Grind, crush, and pass through a 120-mesh sieve to obtain a mixed powder of WC+NiAl with a particle size of less than 120 μm; perform deoxidation pretreatment on the mixed powder of WC+NiAl above in a hydrogen atmosphere at 400°C±50°C; then, the mass The above-mentioned deoxidized pretreated WC+NiAl mixed powder with a percentage of 94.12% was wet-milled with the remaining Co powder (5.88%) for 18 hours to obtain a wet-milled mixture; the wet-milled mixture wa...

Embodiment 2-13

[0029] In Examples 2-13, NiAl-alloyed Co binder phase was used to prepare high-temperature wear-resistant cemented carbide. The process was the same as in Example 1, and the process parameters were shown in Table 1. Wherein the hard phase of embodiment 1-5 is WC; the hard phase of embodiment 6-10 is TiC; the hard phase of embodiment 11-13 is WC and TiC.

[0030] Table 1 Preparation parameters of NiAl alloyed Co binder phase high temperature wear resistant cemented carbide

[0031]

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Abstract

The invention discloses a high-temperature-resistant and wear-resistant hard alloy with a NiAl alloying bonding phase. WC and/TiC is used as a hard phase, NiAl alloying Co and/Fe is used as a bonding phase, and the volume ratio of the hard phase to the bonding phase is equal to 10-40%. The preparation method comprises the following steps of: uniformly mixing 0.03-21.04wt% of nickel powder and aluminum powder with carbide powder based on the component proportion of Ni-50at.%Al; placing the mixture in a graphite container to spread out, heating the mixture to 660-1300 DEG C at a non-oxidative atmosphere, preserving heat, and then naturally cooling to obtain a mixture of a carbide and NiAl; grinding, crushing and screening to obtain mixed powder; carrying out deoxidation pretreatment at a hydrogen atmosphere of 400+/-50 DEG C; carrying out wet grinding on 45.77-96.34wt% of mixed powder and the balance of Co and/Fe powder; carrying out spray-drying on the mixed material subjected to wet grinding and pressing; and sintering a compaction in a liquid phase at low pressure at the temperature of 1350-1550 DEG C to obtain the high-temperature-resistant and wear-resistant hard alloy.

Description

technical field [0001] The invention relates to a cemented carbide material and a preparation method thereof, in particular to a cemented carbide material with high wear resistance prepared by powder metallurgy technology with a hard phase as a matrix and NiAl alloyed Co and / Fe as a binding phase. Alloys and methods of making them. 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 matrix 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 Co is a strategic resource, the price is relatively expensive, and it is prone to softening, oxidation, and high-temperature corrosion under high temperature conditions. Under high temperature conditions, it is easy to wear and fail. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/06C22C29/08C22C1/04
Inventor 龙坚战张忠健陆必志徐涛
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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