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Nanocrystalline non-binding-phase hard alloy and preparation method and application thereof
The invention provides a nanocrystalline unbonded hard alloy and a preparation method and application thereof, and the preparation method comprises the following steps: coating at least two metal layers on the surface of a pre-sintered body, and then sequentially carrying out vacuum sintering and hot isostatic pressing sintering to obtain the nanocrystalline unbonded hard alloy, the relative density of the pre-sintered body is 80% to 92%, and the average crystal grain size of the pre-sintered body is 150 nm or less; according to the method, the surface of the pre-sintered body is coated with the at least two metal layers, sintering densification of the binding-phase-free hard alloy at the low temperature is achieved, and therefore the contradiction that sintering densification is promoted at the high temperature, but grain growth is caused, and grain growth is inhibited at the low temperature, but sintering is not densified is solved; and finally, the nanocrystalline binding-phase-free hard alloy with the average grain size being smaller than 200 nm and the relative density being higher than 99.8% can be obtained.
本发明提供了一种纳米晶无粘结相硬质合金及其制备方法与应用，所述制备方法包括如下步骤：在预烧结体表面包覆至少两层金属层，然后依次进行真空烧结与热等静压烧结，得到所述纳米晶无粘结相硬质合金；所述预烧结体的相对密度为80％至92％，且预烧结体的平均晶粒尺寸为150nm以下；本发明通过在预烧结体表面包覆至少两层金属层，实现了在较低温度下将无粘结相硬质合金烧结致密，从而解决了较高温度促进烧结致密化但导致晶粒长大与较低温度抑制晶粒长大但烧结不致密的矛盾，最终能够得到平均晶粒尺寸小于200nm，且相对密度高于99.8％的纳米晶无粘结相硬质合金。
Nanocrystalline non-binding-phase hard alloy and preparation method and application thereof
The invention provides a nanocrystalline unbonded hard alloy and a preparation method and application thereof, and the preparation method comprises the following steps: coating at least two metal layers on the surface of a pre-sintered body, and then sequentially carrying out vacuum sintering and hot isostatic pressing sintering to obtain the nanocrystalline unbonded hard alloy, the relative density of the pre-sintered body is 80% to 92%, and the average crystal grain size of the pre-sintered body is 150 nm or less; according to the method, the surface of the pre-sintered body is coated with the at least two metal layers, sintering densification of the binding-phase-free hard alloy at the low temperature is achieved, and therefore the contradiction that sintering densification is promoted at the high temperature, but grain growth is caused, and grain growth is inhibited at the low temperature, but sintering is not densified is solved; and finally, the nanocrystalline binding-phase-free hard alloy with the average grain size being smaller than 200 nm and the relative density being higher than 99.8% can be obtained.
本发明提供了一种纳米晶无粘结相硬质合金及其制备方法与应用，所述制备方法包括如下步骤：在预烧结体表面包覆至少两层金属层，然后依次进行真空烧结与热等静压烧结，得到所述纳米晶无粘结相硬质合金；所述预烧结体的相对密度为80％至92％，且预烧结体的平均晶粒尺寸为150nm以下；本发明通过在预烧结体表面包覆至少两层金属层，实现了在较低温度下将无粘结相硬质合金烧结致密，从而解决了较高温度促进烧结致密化但导致晶粒长大与较低温度抑制晶粒长大但烧结不致密的矛盾，最终能够得到平均晶粒尺寸小于200nm，且相对密度高于99.8％的纳米晶无粘结相硬质合金。
Nanocrystalline non-binding-phase hard alloy and preparation method and application thereof
一种纳米晶无粘结相硬质合金及其制备方法与应用
ZHANG TAIQUAN (author) / YE KUNXIONG (author) / WU SONGYI (author) / LIU CHAO (author) / LIN LIANGLIANG (author) / CAI XIAOKANG (author) / ZHAO MEI (author)
2025-01-10
Patent
Electronic Resource
Chinese
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