Method for preparing gradient structure hard alloy
A technology of cemented carbide and gradient structure, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., to achieve the effect of simple process, good strength and toughness, and good performance
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Embodiment 1
[0031] Take WC-Co cemented carbide as a sample and bury it in 15% Mg(OH) 2 and 85% Al 2 o 3 The mixed filler was heated in a hydrogen atmosphere to 1450°C for 1 hour, and then released from the furnace, and then cooled in a hydrogen atmosphere protection environment to obtain a gradient-structure cemented carbide precursor with local decarburization within a certain depth range on the surface of the sample, see Figure 2 (a); Then, put the above precursor into 2 o 3 The mixed filler was carburized at 1450°C for 1 hour in a hydrogen atmosphere, and after rapid cooling, a gradient structure cemented carbide with a gradient binder phase was obtained, as shown in Figure 2(b). The microhardness test shows that the hardness of the surface layer is about 2114HV, that of the middle layer is 1430HV, and that of the core is 1485HV. Co gradient layer, the gradient structure cemented carbide was obtained.
Embodiment 2
[0033] Take WC-Co cemented carbide as a sample and bury it in 10% Mg(OH) 2 and 90% Al 2 o 3 The mixed filler was heated in a hydrogen atmosphere to 1420°C for 1.5 hours and then released from the furnace, and then cooled in a hydrogen atmosphere protection environment to obtain a gradient-structure cemented carbide precursor with local decarburization within a certain depth range on the surface of the sample, see Figure 3 (a); Then, put the above precursor into 2 o 3 The mixed filler was carburized at 1450°C for 1-1.5 hours in a hydrogen atmosphere, and after rapid cooling, a gradient structure cemented carbide with a gradient binder phase was obtained, as shown in Figure 3(b). The microhardness test shows that the hardness of the surface layer is about 1878HV, the hardness of the middle layer is 1402HV, and the hardness of the core is 1535HV. Co gradient layer, the gradient structure cemented carbide was obtained.
Embodiment 3
[0035] Take WC-Co cemented carbide as a sample and bury it in 5% Mg(OH) 2 and 95% Al 2 o 3 The mixed filler was heat-treated at 1430°C in a hydrogen atmosphere for 2 hours, then released from the furnace, and cooled in a hydrogen atmosphere protection environment to obtain a gradient-structure cemented carbide precursor with local decarburization within a certain depth range on the surface of the sample, as shown in Figure 4 ( a); Then, put the precursor into a mixture containing 30% graphite and 70% Al 2 o 3 The mixed filler was carburized at 1430°C for 2 hours in a hydrogen atmosphere, and after rapid cooling, a gradient structure cemented carbide with a gradient binder phase was obtained, as shown in Figure 4(b). The microhardness test shows that the hardness of the surface layer is about 1922HV, that of the middle layer is 1577HV, and that of the core is 1443HV. Co gradient layer, the gradient structure cemented carbide was obtained.
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