Liquid phase sintering of sub micron WC composites containing new binders based on boron doped aluminides

被引:2
作者
Ahmadian, M. [1 ]
Wexler, D. [2 ]
Chandra, T. [2 ]
Calka, A. [2 ]
机构
[1] Isfahan Univ Technol, Dept Mat Engn, Esfahan 8415683111, Iran
[2] Univ Wollongong, Sch Mech Mat & Mechatron, Wollongong, NSW 2522, Australia
来源
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2008年 / 22卷 / 18-19期
关键词
intermetallic matrix composites; aluminides; boron doped; alternative binder; tungsten carbide composites;
D O I
10.1142/S0217979208048231
中图分类号
O59 [应用物理学];
学科分类号
摘要
Densification behavior of sub micron tungsten carbide composites based on boron doped Fe60Al40 and Ni3Al binders were investigated. Soft cobalt binder phase in WC hard metals was replaced by harder and tougher Fe60Al40 and Ni3Al intermetallics with boron level up to 0.1wt%. Intermetallic binders were prepared in ultrafine form under controlled atmosphere using ring grinding, blended with sub micron WC powder and then uniaxilly hot pressed under 20 MPa pressure in argon atmosphere for 4 minutes duration at temperatures of 1450 degrees C, 1500 degrees C and 1550 degrees C. It was found that the density of composites increased significantly and WC grain size increased slightly with increase in sintering temperature. The composites exhibited highest density (about 99.5 % TD) and minimal grain growth in WC at sintering temperature of 1500 degrees C. The presence of boron was found to facilitate densification during liquid phase sintering and boron also resulted in achieving uniform microstructure with continuous binder phase, nearly full density and high faceted features in the structure.
引用
收藏
页码:3296 / 3303
页数:8
相关论文
共 10 条
[1]  
Ahmadian M., 2005, THESIS U WOLLONGONG
[2]  
[Anonymous], 1996, Sintering theory and practice
[3]  
Brookes K. J. A., 1998, HARDMETALS OTHER HAR
[4]   Oxidation behavior of Ni3Al and FeAl intermetallics under low oxygen partial pressures [J].
Gao, W ;
Li, ZW ;
Wu, Z ;
Li, S ;
He, YD .
INTERMETALLICS, 2002, 10 (03) :263-270
[5]   Fracture properties of Fe-40 at.% Al matrix composites reinforced with ceramic particles and fibers [J].
Inoue, M ;
Nagao, H ;
Suganuma, K ;
Niihara, K .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1998, 258 (1-2) :298-305
[6]   IDENTIFICATION OF THERMODYNAMICALLY STABLE CERAMIC REINFORCEMENT MATERIALS FOR IRON ALUMINIDE MATRICES [J].
MISRA, AK .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1990, 21 (02) :441-446
[7]  
Plucknett K. P., 1996, CERAM ENG SCI P, V17, P314
[8]  
SIKKA VK, 1994, PROCESSING, PROPERTIES, AND APPLICATIONS OF IRON ALUMINIDES, P3
[9]   Emerging applications of intermetallics [J].
Stoloff, NS ;
Liu, CT ;
Deevi, SC .
INTERMETALLICS, 2000, 8 (9-11) :1313-1320
[10]   Ceramic composites with a ductile Ni3Al binder phase [J].
Tiegs, TN ;
Alexander, KB ;
Plucknett, KP ;
Menchhofer, PA ;
Becher, PF ;
Waters, SB .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1996, 209 (1-2) :243-247