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High-hardness and high-wear-resistance MAX phase material and preparation method thereof
The invention belongs to the technical field of materials, and relates to a high-hardness and high-wear-resistance MAX phase material and a preparation method thereof. The MAX phase material with high hardness and high wear resistance is obtained by replacing Cr atoms in Cr2AlC with a certain proportion of a lanthanide rare earth element, the chemical formula of the MAX phase material is (Cr2/3Re1/3) 2AlC (Re is a lanthanide rare earth element), and the series of compounds have an orthogonal crystal structure and a monoclinic crystal structure. A compact blocky MAX phase material is obtained through vacuum pressureless sintering and vacuum hot pressed sintering. The material has high hardness (8.5 GPa) which is obviously higher than that of Cr2AlC (4.5 GPa), meanwhile, the material has excellent wear resistance, and the wear loss is reduced to 0.6 * 10 <-5 > mm <-3 > * N <-1 > * m <-1 > from the original 9.6 * 10 <-5 > mm <-3 > * N <-1 > * m <-1 >. According to the method, the M element in the MAX phase is replaced with the rare earth element, and then the hardness and wear resistance of the MAX material are improved by regulating and controlling the crystal structure type of the material; and a series of novel MAX phase materials with high hardness and high wear resistance are prepared, and the variety of MAX materials is enriched.
本发明属于材料技术领域，涉及一种高硬度和高耐磨损的MAX相材料及其制备方法。本发明用一定比例的镧系稀土元素取代Cr2AlC中的Cr原子，获得一种高硬度和高耐磨损的MAX相材料，化学式为：(Cr2/3Re1/3)2AlC（Re为镧系稀土元素），该系列化合物具有正交和单斜两种晶体结构；通过真空无压烧结和真空热压烧结得到了致密的块状MAX相材料；该材料具有高的硬度（8.5GPa），显著高于Cr2AlC（4.5GPa），同时具有优异的耐磨损性能，磨损量由原来的9.6×10‑5mm‑3·N‑1·m‑1降低至0.6×10‑5mm‑3·N‑1·m‑1。本发明用稀土元素取代MAX相中的M元素，进而调控材料的晶体结构类型来提高MAX材料的硬度和耐磨损性能的方法；制备了一系列新型的高硬度和高耐磨损的MAX相材料，丰富了MAX材料的种类。
High-hardness and high-wear-resistance MAX phase material and preparation method thereof
The invention belongs to the technical field of materials, and relates to a high-hardness and high-wear-resistance MAX phase material and a preparation method thereof. The MAX phase material with high hardness and high wear resistance is obtained by replacing Cr atoms in Cr2AlC with a certain proportion of a lanthanide rare earth element, the chemical formula of the MAX phase material is (Cr2/3Re1/3) 2AlC (Re is a lanthanide rare earth element), and the series of compounds have an orthogonal crystal structure and a monoclinic crystal structure. A compact blocky MAX phase material is obtained through vacuum pressureless sintering and vacuum hot pressed sintering. The material has high hardness (8.5 GPa) which is obviously higher than that of Cr2AlC (4.5 GPa), meanwhile, the material has excellent wear resistance, and the wear loss is reduced to 0.6 * 10 <-5 > mm <-3 > * N <-1 > * m <-1 > from the original 9.6 * 10 <-5 > mm <-3 > * N <-1 > * m <-1 >. According to the method, the M element in the MAX phase is replaced with the rare earth element, and then the hardness and wear resistance of the MAX material are improved by regulating and controlling the crystal structure type of the material; and a series of novel MAX phase materials with high hardness and high wear resistance are prepared, and the variety of MAX materials is enriched.
本发明属于材料技术领域，涉及一种高硬度和高耐磨损的MAX相材料及其制备方法。本发明用一定比例的镧系稀土元素取代Cr2AlC中的Cr原子，获得一种高硬度和高耐磨损的MAX相材料，化学式为：(Cr2/3Re1/3)2AlC（Re为镧系稀土元素），该系列化合物具有正交和单斜两种晶体结构；通过真空无压烧结和真空热压烧结得到了致密的块状MAX相材料；该材料具有高的硬度（8.5GPa），显著高于Cr2AlC（4.5GPa），同时具有优异的耐磨损性能，磨损量由原来的9.6×10‑5mm‑3·N‑1·m‑1降低至0.6×10‑5mm‑3·N‑1·m‑1。本发明用稀土元素取代MAX相中的M元素，进而调控材料的晶体结构类型来提高MAX材料的硬度和耐磨损性能的方法；制备了一系列新型的高硬度和高耐磨损的MAX相材料，丰富了MAX材料的种类。
High-hardness and high-wear-resistance MAX phase material and preparation method thereof
一种高硬度和高耐磨损的MAX相材料及其制备方法
ZHAI HAO (author) / CUI WEIBIN (author) / SUN SHULI (author)
2021-10-15
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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