对471和3555两种硬质合金进行高温氧化试验,使用扫描电镜对氧化层组织进行观察,并对其氧化过程进行热力学和动力学分析.结果表明:硬质合金氧化时,粘结相比硬质相优先发生氧化.氧化后471合金晶粒由规则多边形状变为柱状,而3555合金氧化层外层组织呈柱状,内层氧化物为层状.两种合金的氧化速度都随氧化温度升高而急剧上升,471合金氧化增重曲线几乎为直线,其氧化反应激活能254.7 kJ· mol-,3555合金氧化增重符合抛物线规律,氧化激活能大小为336.7 kJ·mol-1.
参考文献
| [1] | P. Kindermann;P. Schlund .High-temperature fatigue of cemented carbides under cyclic loads[J].International Journal of Refractory Metals & Hard Materials,1999(1/3):55-68. |
| [2] | 张玉华;张纪生 .铁、镍基粘结相硬质合金研究的新进展[J].稀有金属与硬质合金,1995,3:50-56. |
| [3] | 王兴庆,李晓东,郭海亮,何宝山.Al含量对WC-Co硬质合金耐腐蚀性能的影响[J].粉末冶金材料科学与工程,2006(04):219-224. |
| [4] | 胡道平,何宝山,孔德会.Cr含量对WC基硬质合金耐腐蚀性能的影响[J].腐蚀与防护,2006(08):382-386,421. |
| [5] | S.G. Huang;L. Li;O. Van der Biest .VC- and Cr_3C_2-doped WC-NbC-Co hardmetals[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2008(1/2):205-211. |
| [6] | B. V. Manoj Kumar;R. Balasubramaniam;Bikramjit Basu .Electrochemical Behavior of TiCN-Ni-Based Cermets[J].Journal of the American Ceramic Society,2007(1):205-210. |
| [7] | 张伟;蒋勇 .耐腐蚀硬质合金的性能与选用[J].粉末冶金技术,1994,12(03):235-235. |
| [8] | 黄道远,易丹青,刘会群,蔡志刚,刘瑞,李荐.硬质合金强度随温度的变化及失效机理的研究[J].材料热处理学报,2007(05):105-108. |
| [9] | Basu S N;Sarin V K et al.Oxidation behavior of WC-Co[J].Materials Science and Engineering A,1996,209:206-212. |
| [10] | B. Casas;X. Ramis;M. Anglada .Oxidation-induced strength degradation of WC-Co hardmetals[J].International Journal of Refractory Metals & Hard Materials,2001(4/6):303-309. |
| [11] | Voitovich V B;Sverdel V V;Voitovich R F et al.Oxidation of WC-Co,WC-Ni and WC-Co-Ni hard metals in the temperature range 500 ～ 800 ℃[J].International Journal of Refractory Metals and Hard Materials,1996,14(04):289-295. |
| [12] | Exner H .Methods and significance of particle and grain size control in cemented carbide technology[J].Powder Metallurgy,1970,26(13):429-448. |
| [13] | W.Acchar;U.U.Gomes .Strength Degradation of a Tungsten Carbide-Cobalt Composite at Elevated Temperatures[J].Materials Characterization,1999(1):27-32. |
| [14] | Kloop W D;Waykuth J D;Sins C T et al.Oxidation and contamination reactions of niobium and niobium alloys.Report No.1317[R].Battelle Memorial Institute,1959. |
| [15] | 李美栓.金属的高温腐蚀[M].北京:冶金工业出版社,2001 |
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