气压烧结工艺对Mo_2FeB_2基金属陶瓷组织和性能的影响
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摘要
利用气压烧结制备了Mo_2FeB_2基金属陶瓷,研究了不同气压烧结工艺条件下金属陶瓷的显微组织及力学性能的变化规律。结果表明,高温液相烧结过程中的气压没有明显促进金属陶瓷晶粒的生长。气压烧结对孔径尺寸小于0.5μm的气孔无明显的降低作用,但基本消除了孔径大于1.0μm的气孔,同时显著降低了气孔尺寸的分散性,使绝大部分气孔集中在0.2～0.6μm的范围内。与真空烧结相比,气压烧结使金属陶瓷的抗弯强度从1 909.1 MPa提高到2 148.4 MPa,硬度从89.1 HRA提高到89.8 HRA,相对致密度从98.8%提高到99.4%。
The Mo_2FeB_2-based cermets were prepared by gas pressure sintering. The microstructure and mechanical properties of cermets under different gas pressure sintering conditions were studied. The results show that the growth of grains is not promoted by the gas pressure during high temperature liquid phase sintering. Gas pressure sintering has no obvious effect on pore with size less than 0.5 μm, but it basically eliminates pores with size greater than 1.0 μm. In addition,the dispersion of pore size is significantly reduced and mainly concentrated in the range of 0.2～0.6 μm during gas pressure sintering. Compared with vacuum sintering, the gas pressure sintering increases the transverse rupture strength of cermets from 1909.1 to 2 148.4 MPa, while the hardness from 89.1 to 89.8 HRA, and the relative density from 98.8% to 99.4%,respectively.
The Mo_2FeB_2-based cermets were prepared by gas pressure sintering. The microstructure and mechanical properties of cermets under different gas pressure sintering conditions were studied. The results show that the growth of grains is not promoted by the gas pressure during high temperature liquid phase sintering. Gas pressure sintering has no obvious effect on pore with size less than 0.5 μm, but it basically eliminates pores with size greater than 1.0 μm. In addition,the dispersion of pore size is significantly reduced and mainly concentrated in the range of 0.2～0.6 μm during gas pressure sintering. Compared with vacuum sintering, the gas pressure sintering increases the transverse rupture strength of cermets from 1909.1 to 2 148.4 MPa, while the hardness from 89.1 to 89.8 HRA, and the relative density from 98.8% to 99.4%,respectively.
引文
[1]Takagi K. Development and application of high strength ternary boride base cermets[J]. Journal of Solid State Chemistry, 2006, 179(9):2809-2818.
[2]Takagi K, Ohira S, Ide T, Watanabe T. New multiple-boride base hard alloy[J]. Metal Powder Report, 1987, 42(7-8):483-490.
[3]Haizhou Yu, Zheng Yong, Liu Wenjun, Zheng Jianzhi Xiong Weihao.Effect of Mn content on the microstructure and mechanical properties of Mo2FeB2based cermets[J]. International Journal of Refractory Metals and Hard Materials, 2010, 28(2):286-290.
[4]Takagi K, Yamasaki Y. Effects of Mo/B atomic ratio on the mechanical properties and structure of Mo2NiB2boride base cermets with Cr and V additions[J]. Journal of Solid State Chemistry, 2000, 154(1):263-268.
[5]Yamasaki Y, Nishi M, Takagi K. Development of very high strength Mo2NiB2complex boride base hard alloy[J]. Journal of Solid State Chemistry, 2004, 177(2):551-555.
[6]Komai M, Isobe Y, Ozaki S, Takagi K. Effects of Cr on the microstructure and mechanical properties of WCoB base hard alloys[J].Journal of the Japan Society of Powder and Powder Metallurgy, 1993, 40(1):38-43.
[7]庞旭明,郑勇,王少刚,王秋红. Mn对Mo2NiB2基金属陶瓷组织和力学性能的影响[J].中国有色金属学报,2009,19(9):1618-1624.Pang Xuming, Zheng Yong, Wang Shaogang, WangQiuhong. Effects of Mn on structure and mechanical properties of Mo2NiB2-based cermets[J].The Chinese Journal of Nonferrous Metals, 2009, 19(9):1618-1624.
[8]余海洲,刘文俊,张明松,等. Mo2NiB2基金属陶瓷的相变及其显微组织演变研究Ⅰ:相变[J].硬质合金, 2011, 28(3):137-142.Yu Haizhou, Liu wenjun, Zhang Mingsong, et al. Investigation of phase transformation and microstructure evolution of Mo2NiB2-based cermet I:phase transformation[J]. Cemented Carbide, 2011, 28(3):137-142.
[9]李阳,余海洲,赵迪等.热等静压对Mo2NiB2基金属陶瓷的组织及性能的影响[J].金属热处理,2017,42(5):112-116.Li Yang,Yu Haizhou,Zhao Di. Effect of HIP on properties and microstructure of Mo2NiB2-based cermet[J]. Heat Treatment of Metals,2017,42(5):112-116.
[10]Haizhou Yu, Zheng Yong, Liu Wenjun Pang Xuming, Xiong Weihao.Effect of Mo/B atomic ratio on the microstructure and mechanical properties of Mo2NiB2based cermets. International Journal of Refractory Metals and Hard Materials, 2010, 28(3):338-342.
[11]Caihong Sun, Haizhou Yu and Wenjun Liu. Microstructure, mechanical properties and first-principles calculations of Mo2FeB2-based cermets with Mn addition[J]. Journal of the ceramic society of Japan,2017, 125(9):677-680
[12]Haizhou Yu, Zheng Yong, Liu Wenjun, Zheng Jianzhi Xiong Weihao. Effect of V content on the microstructure and mechanical properties of Mo2NiB2based cermets[J]. Materials&Design, 2010, 31(5):2680~2683.
[13]郑建智,承新,郑勇,等.烧结工艺和碳加入量对Mo2NiB2基金属陶瓷显微组织和力学性的影响[J].机械工程材料, 2009, 33(3):31~34.Zheng J Z, Cheng X, Zheng Y, et al. Effects of sintering technique and amount of carbon addition on microstructure and mechanical properties of Mo2NiB2based cermets[J]. Materials for Mechanical Engineering,2009,33(3):31-34.
[14]Ide T, Ando T. Reaction sintering of an Fe-6 Wt Pct B-48 Wt Pct Mo alloy in the presence of liquid phases[J]. Metallurgical and Materials Transactions A, 1989, 20(1):17-24.
[2]Takagi K, Ohira S, Ide T, Watanabe T. New multiple-boride base hard alloy[J]. Metal Powder Report, 1987, 42(7-8):483-490.
[3]Haizhou Yu, Zheng Yong, Liu Wenjun, Zheng Jianzhi Xiong Weihao.Effect of Mn content on the microstructure and mechanical properties of Mo2FeB2based cermets[J]. International Journal of Refractory Metals and Hard Materials, 2010, 28(2):286-290.
[4]Takagi K, Yamasaki Y. Effects of Mo/B atomic ratio on the mechanical properties and structure of Mo2NiB2boride base cermets with Cr and V additions[J]. Journal of Solid State Chemistry, 2000, 154(1):263-268.
[5]Yamasaki Y, Nishi M, Takagi K. Development of very high strength Mo2NiB2complex boride base hard alloy[J]. Journal of Solid State Chemistry, 2004, 177(2):551-555.
[6]Komai M, Isobe Y, Ozaki S, Takagi K. Effects of Cr on the microstructure and mechanical properties of WCoB base hard alloys[J].Journal of the Japan Society of Powder and Powder Metallurgy, 1993, 40(1):38-43.
[7]庞旭明,郑勇,王少刚,王秋红. Mn对Mo2NiB2基金属陶瓷组织和力学性能的影响[J].中国有色金属学报,2009,19(9):1618-1624.Pang Xuming, Zheng Yong, Wang Shaogang, WangQiuhong. Effects of Mn on structure and mechanical properties of Mo2NiB2-based cermets[J].The Chinese Journal of Nonferrous Metals, 2009, 19(9):1618-1624.
[8]余海洲,刘文俊,张明松,等. Mo2NiB2基金属陶瓷的相变及其显微组织演变研究Ⅰ:相变[J].硬质合金, 2011, 28(3):137-142.Yu Haizhou, Liu wenjun, Zhang Mingsong, et al. Investigation of phase transformation and microstructure evolution of Mo2NiB2-based cermet I:phase transformation[J]. Cemented Carbide, 2011, 28(3):137-142.
[9]李阳,余海洲,赵迪等.热等静压对Mo2NiB2基金属陶瓷的组织及性能的影响[J].金属热处理,2017,42(5):112-116.Li Yang,Yu Haizhou,Zhao Di. Effect of HIP on properties and microstructure of Mo2NiB2-based cermet[J]. Heat Treatment of Metals,2017,42(5):112-116.
[10]Haizhou Yu, Zheng Yong, Liu Wenjun Pang Xuming, Xiong Weihao.Effect of Mo/B atomic ratio on the microstructure and mechanical properties of Mo2NiB2based cermets. International Journal of Refractory Metals and Hard Materials, 2010, 28(3):338-342.
[11]Caihong Sun, Haizhou Yu and Wenjun Liu. Microstructure, mechanical properties and first-principles calculations of Mo2FeB2-based cermets with Mn addition[J]. Journal of the ceramic society of Japan,2017, 125(9):677-680
[12]Haizhou Yu, Zheng Yong, Liu Wenjun, Zheng Jianzhi Xiong Weihao. Effect of V content on the microstructure and mechanical properties of Mo2NiB2based cermets[J]. Materials&Design, 2010, 31(5):2680~2683.
[13]郑建智,承新,郑勇,等.烧结工艺和碳加入量对Mo2NiB2基金属陶瓷显微组织和力学性的影响[J].机械工程材料, 2009, 33(3):31~34.Zheng J Z, Cheng X, Zheng Y, et al. Effects of sintering technique and amount of carbon addition on microstructure and mechanical properties of Mo2NiB2based cermets[J]. Materials for Mechanical Engineering,2009,33(3):31-34.
[14]Ide T, Ando T. Reaction sintering of an Fe-6 Wt Pct B-48 Wt Pct Mo alloy in the presence of liquid phases[J]. Metallurgical and Materials Transactions A, 1989, 20(1):17-24.