Al<sub>2</sub>O<sub>3</sub>基复合金属陶瓷模具材料的组织结构与力学性能

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摘要以纳米Al₂O₃和纳米Ti(C,N)为主要原料,以Mo和Ni粉等为助烧剂,采用N₂气氛保护热压工艺制备Al₂O₃基复合金属陶瓷模具材料。采用XRD和SEM分析材料的物相组成及微观结构,并测试材料的力学性能。结果表明,当烧结温度为1 660 ℃,纳米Al₂O₃质量分数为74.5%,纳米Ti(C,N)粉为20%、Mo+Ni粉为5%时,所制备的Al₂O₃基复合金属陶瓷模具材料性能最佳,其相对密度为98.14%,弯曲强度值为795.98 MPa,硬度值为18.52 GPa,断裂韧性为8.05 MPa·m^1/2。第二相的引入和晶界处Mo+Ni的共同作用,可增强晶界强度,促进沿晶裂纹向穿晶裂纹转变,从而提高材料的力学性能。

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	刘咸超
	郭容

关键词 ：纳米氧化铝, Ti(C,N), 热压烧结, 力学性能, 物相组成, 显微结构

Abstract：The alumina matrix composite metal-ceramic die materials were fabricated by hot-pressing sintering technique in N₂ atmosphere using nano Al₂O₃ and Ti(C,N) as the main raw materials, Mo and Ni as sintering additives. The phase composition and microstructure were tested and analyzed by XRD and SEM. The mechanical property was also studied. The results show that when the sintering temperature is 1 660 ℃, the mass fraction of nano Al₂O₃ is 74.5%, nano Ti(C,N) is 20% and Mo+Ni is 5%, the prepared alumina matrix composite metal ceramic die material can obtain the optimal properties. And the relative density is 98.14%, flexural strength is 795.98 MPa, hardness is 18.52 GPa and fracture toughness is 8.05 MPa·m^1/2. Introduced second phase and Mo+Ni in the boundary of crystal can increase the crystal boundary strength, accelerate intergranular crack transit to transgranular cracks, then enhance mechanical properties of the samples.

Key words： Nano alumina Ti(C,N) hot-pressing sistering mechanical properties phase composition microstructure

收稿日期: 2018-06-26 出版日期: 2019-07-12

ZTFLH:

TF125.42

通讯作者: 刘咸超,讲师。E-mail: rong_hu8019@163.com

引用本文:

刘咸超, 郭容. Al₂O₃基复合金属陶瓷模具材料的组织结构与力学性能[J]. 粉末冶金材料科学与工程, 2019, 24(1): 58-62.
LIU Xianchao, GUO Rong. Microstructure and mechanical properties of Al₂O₃matrix composite metal ceramic die materials. Materials Science and Engineering of Powder Metallurgy, 2019, 24(1): 58-62.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2019/V24/I1/58

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