在SPS过程中碳污染的研究

基金项目:

国家自然科学基金资助项目(59981001)

教育部全国优秀博士学位论文作者专项资金资助项目(200030).

详细信息

Study on the Carbon Pollution in SPS

College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China

摘要: 为了研究放电等离子烧结(SPS)过程中采用石墨模具对烧结材料的污染情况,以金属W为原料,用石墨模具,压力为30 MPa,分别在1 500℃和1 900℃下进行放电等离子烧结.对烧结体的表层和表层下0.5 mm处进行了X衍射物相分析,用扫描电镜对1 900℃下烧结体的横截面进行了形貌观察和线扫描,并对化学反应进行了热力学计算.结果表明:石墨模具与物料金属W会直接发生化学反应;污染产物碳化物存在于W烧结体表层300nm以内区域,表层下0.5 mm处仅有单质W存在;1 500℃表层有W2C和WC生成,1 900℃仅有WC生成.
- 放电等离子烧结 /
- X射线衍射 /
- 碳污染
Abstract: In order to study the pollution of graphite die on the sintered material in spark plasma sintering (SPS), The metal tungsten as the material and the graphite die were heated in SPS by a pulse direct current. The pollution of carbon was studied when the tungsten was sintered by SPS at 1 500℃ or 1 900℃ with applying pressure of 30 MPa. By means of X-ray analysis and SEM observation and thermodynamic calculation, it was found that graphite could directly react with tungsten. Carbide pollution layer was formed at about 300nm deep from the surface. There was only tungsten under 500nm from the surface. The pollution layer was composed of WC at 1 500℃, and of WC and W₂C at 1 900 ℃.
- spark plasma sintering(SPS) /
- X-ray diffraction /
- carbon pollution

[1]	张东明,傅正义.放电等离子加压烧结技术特点及应用[J].武汉工业大学学报,1999,21(6) :15-17. ZHANG Dong-ming, FU Zheng-yi. Mechanism and application of spark plasma sintering technology [J]. Journal of Wuhan University of Technology, 1999, 21(6) : 15-17. (in Chinese)
[2]	高濂,宫本大树.放电等离子烧结技术[J].无机材料学报,1997,12(4) :129-133. GAO Lian, MIYAMOTO Hiroki. Spark plasma sintering technology[J] . Journal of Inorganic Materials, 1997, 12(4) : 129-133. (in Chinese)
[3]	MAMORU Omori. Sintering, consolidation, reaction and crystal growth by the spark plasma system (SPS) [J]. Mat Sci and Eng, 2000, A287: 183-188.
[4]	株洲硬质合金厂.硬质合金生产[M].北京:冶金工业出版社,1974. Zhuzhou Hardmetals Factory. The Manufacture of Hardmetals[M]. Beijing: Metallurgy Industry Press, 1974. (in Chinese)
[5]	梁英教,车荫昌.无机物热力学数据手册[M].沈阳:东北大学出版社,1993. LIANG Ying-jiao, CHE Yin-chang. Thermodynamics Databook of Ingornic Compound[M]. Shenyang: North East University Press, 1993. (in Chinese)