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烧结工艺对WC-1.0TiC-3.1TaC-4.5Co硬质合金性能及微观组织的影响
李重典, 时凯华, 王海霞, 闵召宇, 廖军, 徐志超
材料工程 ›› 2016, Vol. 44 ›› Issue (12) : 74-79.
PDF(19985 KB)
PDF(19985 KB)
烧结工艺对WC-1.0TiC-3.1TaC-4.5Co硬质合金性能及微观组织的影响
Effect of Sintering Process on Properties and Microstructure of WC-1.0TiC-3.1TaC-4.5Co Cemented Carbides
({{custom_author.role_en}}), {{javascript:window.custom_author_en_index++;}}采用传统粉末冶金法,分别用真空烧结和低压烧结工艺制备出一系列WC-1.0TiC-3.1TaC-4.5Co硬质合金样品。利用光学显微镜、扫描电镜与能谱仪对合金微观组织结构特征进行观察与分析。结果表明:提高真空工艺烧结温度或采用低压烧结工艺,能使合金内部的显微孔隙、钴池减少;低压烧结制备的合金WC晶粒度小于真空烧结制备的合金WC晶粒度,合金中易出现WC晶粒异常长大现象。
A series of WC-1.0TiC-3.1TaC-4.5Co cemented carbides were prepared by vacuum sintering and Sintering-HIP through traditional powder metallurgy method. Optical microscopy(OM),scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were used to characterize the microstructures. The results show that pores and cobalt-lake can be reduced in cemented carbides by increasing sintering temperature or using Sintering-HIP. The mean size of WC cemented carbide prepared by vacuum sintering process is larger than that prepared by Sintering-HIP. Furthermore, the phenomenon of WC abnormal growth was found in the cemented carbides prepared by Sintering-HIP.
硬质合金 / 烧结工艺 / 性能 / 微观组织 {{custom_keyword}} /
cemented carbide / sintering process / property / microstructure {{custom_keyword}} /
表 1 粉末原料的物理和化学性能Table 1 Physical and chemical properties of experimental raw powders |
| Powder | FSSS-value/μm | Total carbon/% | Oxygen content/% | Free carbon/% |
| WC | 0.85 | 6.16 | 0.03 | 0.12 |
| Co | 1.15 | 0.03 | - | 0.45 |
| CTC-3 | 3.60 | 12.46 | 0.07 | 0.25 |
| TaC | 1.35 | 6.21 | 0.06 | 0.21 |
表 2 制备WC-1.0TiC-3.1TaC-4.5Co合金的烧结工艺Table 2 Sintering process of WC-1.0TiC-3.1TaC-4.5Co samples |
| Sample | Sintering process |
| 1# | Vacuum sintering process(sintered at 1300℃ for 30min) |
| 2# | Vacuum sintering process (sintered at 1400℃ for 90min) |
| 3# | Vacuum sintering process (sintered at 1460℃ for 90min) |
| 4# | Sintering-HIP(sintered at 1400℃ for 90min under 0.9MPa pressure) |
| 5# | Sintering-HIP(sintered at 1460℃ for 90min under 0.9MPa pressure) |
| 6# | Sintering-HIP(sintered at 1460℃ for 90min under 3.0MPa pressure) |
| 7# | Sintering-HIP(sintered at 1460℃ for 90min under 5.0MPa pressure) |
表 3 不同烧结工艺对合金试样组织的影响Table 3 Microstructure of samples prepared by different sintering process |
| Sample | Sintering process | Porosity | Cobalt phase |
| 1# | Vacuum/1300℃/30min | A08B08C00 | Cobalt lake |
| 2# | Vacuum/1400℃/90min | A02B00C00 | Cobalt lake |
| 3# | Vacuum/1460℃/90min | A02B00C00 | Cobalt lake |
| 4# | HIP/1400℃/ 0.9MPa/90min | A02B00C00 | Cobalt lake |
| 5# | HIP/1460℃/0.9MPa/90min | A02B00C00 | - |
| 6# | HIP/1460℃/ 3.0MPa/90min | A02B00C00 | - |
| 7# | HIP/1460℃/5.0MPa/90min | A02B00C00 | - |
图 2 不同烧结工艺制备的合金试样的光学低倍金相图片(a)1#;(b)2#;(c)3#;(d)4#;(e)5#;(f)6#;(g)7# Fig.2 OM micrographs of samples prepared by different sintering process (a)1#;(b)2#;(c)3#;(d)4#;(e)5#;(f)6#;(g)7# |
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PDF(19985 KB)
表 1 粉末原料的物理和化学性能表 2 制备WC-1.0TiC-3.1TaC-4.5Co合金的烧结工艺
图 1 烧结工艺曲线表 3 不同烧结工艺对合金试样组织的影响图 2 不同烧结工艺制备的合金试样的光学低倍金相图片图 3 不同烧结工艺制备的合金试样的SEM形貌表 4 图 3中6#合金试样微区EDS分析结果图 4 硬质合金密度和硬度与烧结工艺的关系图 5 硬质合金Co磁和矫顽力与烧结工艺的关系/
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