Cr_3C_2含量对纳米WC-6Co复合粉烧结的影响
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摘要
研究了不同Cr_3C_2添加量对纳米WC-6Co复合粉烧结的影响.结果表明:添加Cr_3C_2会细化晶粒,但过多的添加Cr_3C_2时,η相(缺碳相)会容易溶Co而分解,导致晶粒尺寸的粗化.随Cr_3C_2添加量的增加,硬质合金的孔隙率逐渐增加.当Cr_3C_2添加量为0.6wt.%,与未加Cr_3C_2材料的抗弯强度相比,抗弯强度提高约13%,材料的硬度可达到93.2HRA.随Cr_3C_2添加量的增加,硬质合金的断裂韧性逐渐降低.
The effect of Cr_3C_2 addition on the sintering of nano WC-6Co powder was studied. The results showed that the grain was fined with addition of Cr_3C_2, the grain began coarsening with excess addition of Cr_3C_2, which was resulting from the decomposition of the η phase dissolving in Co binder phase. The porosity of the cemented carbide increased with increasing Cr_3C_2 addition. Compared with the cemented carbide with no Cr_3C_2 addition, the highest TRS with 0.6wt.% Cr_3C_2 addition increased by about 13%, the hardness was 93.2HRA. The fracture toughness(K_(1C)) of the cemented carbide decreased with increasing Cr_3C_2 addition.
The effect of Cr_3C_2 addition on the sintering of nano WC-6Co powder was studied. The results showed that the grain was fined with addition of Cr_3C_2, the grain began coarsening with excess addition of Cr_3C_2, which was resulting from the decomposition of the η phase dissolving in Co binder phase. The porosity of the cemented carbide increased with increasing Cr_3C_2 addition. Compared with the cemented carbide with no Cr_3C_2 addition, the highest TRS with 0.6wt.% Cr_3C_2 addition increased by about 13%, the hardness was 93.2HRA. The fracture toughness(K_(1C)) of the cemented carbide decreased with increasing Cr_3C_2 addition.
引文
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[3]Soleimanpour A M,Abachi P,Simchi A.Microstructure and mechanical properties of WC-10Co cemented carbide containing VC or(Ta,Nb)C and fracture toughness evaluation using different models[J].International Journal of Refractory Metals and Hard Materials,2012,31(4):141-146.
[4]Fan P,Fang Z Z,Guo J.A review of liquid phase migration and methods for fabrication of functionally graded cemented tungsten carbide[J].International Journal of Refractory Metals and Hard Materials,2013,36(1):2-9.
[5]范景莲,李志希,缪群,等.超细/纳米硬质合金及晶粒长大抑制剂的研究[J].粉末冶金技术,2004,22(5):259-265.
[6]王洪涛,王旭,余永宁.纳米WC/Co硬质合金粉末烧结早期的晶粒长大研究[J].稀有金属与硬质合金,2005,33(1):19-22.
[7]Goren-Muginstein G R,Berger S,Rosen A.Sintering Study of nanocrystalline tungsten carbide powders[J].Nanostructured Materials,1998,10(5):795-804.
[8]李炯义,曹顺华,林信平.硬质合金中的晶粒长大抑制剂[J].硬质合金,2004,32(3):56-60.
[9]Shetty D,Wright I,Mincer P,et al.Indentation fracture of WC-Co cermets[J].Journal of Materials.Science,1985,20:1873-1882.
[10]郑虎春,范景莲,杨文华,等.晶粒长大抑制剂对超细硬质合金刀具磨损性能的影响[J].稀有金属材料与工程,2015,44(4):912-917.
[11]王国栋.硬质合金生产原理[M].北京:冶金工业出版社,1988.
[12]Shubert W D,Bock A,Lux B.General aspects and limits of conventional ultrafine WC powder manufacture and hard metal production[J].International Journal of Refractory Metals and Hard Matcria1s,1995,13(5):281-296.