热压烧结原位合成Coss/Co3Mo2Si复合材料

邹二勇; 刘济慧; 邹欣伟

doi:10.19591/j.cnki.cn11-1974/tf.2020.03.008

热压烧结原位合成Co_ss/Co₃Mo₂Si复合材料

doi: 10.19591/j.cnki.cn11-1974/tf.2020.03.008

1.
嘉兴南洋职业技术学院机电工程分院, 嘉兴 314031
2.
太原科技大学材料科学与工程学院, 太原 030024

基金项目:

山西省重点研发计划资助项目 201803D121027

太原科技大学博士科研启动基金资助项目 20162006

详细信息

通讯作者:
邹欣伟, E-mail: xwzou@tyust.edu.cn

中图分类号: TG148
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- 被引次数: 0
出版历程
- 收稿日期: 2019-03-26
- 刊出日期: 2020-06-27

In-situ synthesis of Co_ss/Co₃Mo₂Si composite by hot-pressing sintering

1.
School of Mechanical and Electrical Engineering, Jiaxing Nanyang Polytechnic Institute, Jiaxing 314031, China
2.
School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

More Information

Corresponding author: ZOU Xin-wei, E-mail: xwzou@tyust.edu.cn

摘要

摘要: 为优化过渡金属硅化物的中低温脆性, 以金属粉末为原料通过热压烧结制备了Co₃Mo₂Si增强、Co基固溶体(Co_ss)增韧Co_ss/Co₃Mo₂Si复合材料, 并对其微观组织结构及力学性能进行了研究。结果表明: Co_ss/Co₃Mo₂Si复合材料主要由Co₃Mo₂Si三元金属硅化物相和Co_ss相组成, 两相均匀分布; Co₃Mo₂Si三元金属硅化物相质量分数增加材料的硬度升高, 但抗弯强度降低, Co_ss相质量分数增加材料的相对密度和抗弯强度均升高; 抗弯强度的最大值可由单一Co₃Mo₂Si相的335.7MPa提高到Co_ss/Co₃Mo₂Si复相的756.2MPa。
- 过渡金属硅化物 /
- 热压烧结 /
- 原位合成 /
- 硬度 /
- 抗弯强度
Abstract: To optimize the brittleness of transition metal silicides at low and medium temperature, the Co₃Mo₂Si reinforced and Co-based solid solution (Co_ss) toughened Co_ss/Co₃Mo₂Si composites were in-situ synthetised by hot pressing sintering, using metal powders as raw materials, and the microstructure and mechanical properties of Co_ss/Co₃Mo₂Si composites were studied. The results show that the Co_ss/Co₃Mo₂Si composites mainly consist of Co₃Mo₂Si ternary metal silicide phase and Coss phase in uniform distribution. With the increase of Co₃Mo₂Si ternary metal silicide phase weight fraction, the hardness increases but the bending strength decreases; with the increase of Coss phase weight fraction, the relative density and bending strength increase. The maximum bending strength can be increased from 335.7 MPa of Co₃Mo₂Si single phase to 756.2 MPa of Co_ss/Co₃Mo₂Si dual phases.
- transition metal silicides /
- hot-pressing sintering /
- in-situ synthesis /
- hardness /
- bending strength

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图 1 1#、2A#和3#烧结试样的X射线衍射图谱

Figure 1. XRD patterns of the 1#, 2A#, and 3# sintered samples

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图 2 烧结试样的光学显微镜金相组织形貌：(a) Co₃Mo₂Si; (b) 1#;(c) 2A#; (d) 3#

Figure 2. OM micrographs of the sintered samples: (a) Co₃Mo₂Si; (b) 1#; (c) 2A#; (d) 3#

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图 3 1#烧结试样的电子探针显微面分析结果：(a) 背散射成分像; (b) Co; (c) Si; (d) Mo

Figure 3. EPMA area analysis results of the sintered sample 1#: (a) the backscattering morphology; (b) Co; (c) Si; (d) Mo

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图 4 烧结试样的断口显微形貌：(a) 1#; (b) 2A#; (c) 3#; (d) 2B#; (e) 2C#

Figure 4. Fracture morphology of the sintered samples: (a) 1#; (b) 2A#; (c) 3#; (d) 2B#; (e) 2C#

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表 1 Co_ss/Co₃Mo₂Si复合材料试样化学成分和烧结参数

Table 1. Chemical compositions and sintering parameters of the Co_ss/Co₃Mo₂Si composite samples

试样编号	元素质量分数/%			元素原子数比	球磨时间/h	烧结温度/ ℃	烧结时间/h	烧结压力/MPa
试样编号	Co	Mo	Si	Co: Mo: Si	球磨时间/h	烧结温度/ ℃	烧结时间/h	烧结压力/MPa
Co₃Mo₂Si 44.56		48.36	7.08	3:2:1	5	1250	1	30
1#	46.92	46.30	6.78	3.3:2:1	5
2A#	52.95	41.05	6.00	4.2:2:1	5
2B#	52.95	41.05	6.00	4.2:2:1	10
2C#	52.95	41.05	6.00	4.2:2:1	20
3#	59.13	35.65	5.22	5.4:2:1	5

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表 2 烧结试样的力学性能

Table 2. Mechanical properties of the sintered Co_ss/Co₃Mo₂Si composite samples

试样编号	Co₃Mo₂Si质量分数/%	Co_ss质量分数/%	测试密度/(g·cm^-3)	相对密度/%	抗弯强度/MPa	硬度, HV
Co₃Mo₂Si	100	0	6.97	77.6	335.7	1140
1#	95.73	4.27	7.04	78.6	364.5	1060
2A#	84.87	15.13	8.31	93.0	489.6	910
2B#	84.87	15.13	7.57	84.7	528.8	904
2C#	84.87	15.13	7.04	78.7	701.3	918
3#	73.72	26.28	8.75	98.0	756.2	810

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