【摘 要】
：
The effect of the sintering atmospheres (vacuum, N2, Ar) on the microstructures and properties of the TiC based cermets was studied using XRD, SEM/BSE and energ
【机 构】
：
Department of Metallurgy,State Key Laboratory of Powder Metallurgy
【基金项目】
：
国家高技术研究发展计划(863计划);Scientific Research Fund of Education Department of Hunan Province
论文部分内容阅读
The effect of the sintering atmospheres (vacuum, N2, Ar) on the microstructures and properties of the TiC based cermets was studied using XRD, SEM/BSE and energy dispersive spectrometer. Compared with the alloy sintered in vacuum, the carbon content of the specimen sintered in N2 and Ar is lower by 0.5%; and the nitrogen content is higher by 0.3% when sintered in nitrogen.The central part of the ring structure may be carbide with either a high W or Ti content. The ring structures are (Ti, W, Ta, Mo, Co,Ni)C solid solutions with different metallic elements and distributions. The composition of the binder phase is (Co, Ni) solid solution with different Ti, W, Ta, Mo, C contents. The structures are uniform for the cermets sintered in vacuum and the properties are the best.When sintered in Ar or N2, the O2 and N2 in the atmosphere take part in the sintering reaction to break the carbon balance in the cermets to form a shell structure and defects, which results in poor density, microhardness (HV) and transverse rupture strength (TRS).
其他文献
The rule-of-mixture approach has become one of the widely spread ways to investigate the mechanical properties of nano-materials and nano-structures, and it is
虽然在学生能否使用计算器的问题上,已经是许多专家争论多年的话题.有人支持,有人反对,也有人持观望的态度,但是我个人的观点认为:学生从小就不能使用计算器,为目后的运算打
Based on viscoelastic theory, two new computational methods of solving linear equations and minimum value of the 1-norm were put forward for transforming Kohlra
The high-energy shot peening (HESP) technique was used to obtain the surface nanocrystalline microstructure for a hcp metal titanium. XRD, SEM and TEM were appl
The stability and stabilization of a class of linear switched time-varying delay systems are investigated.A piecewise quadratic Lyapunov function (PWQLF) is con
Ni-P-SiC composite coatings were prepared under a given bath composition and operation parameters of electroless plating. The tribological properties of the Ni-
Anatase titanium dioxide is an active photocatalyst, however, it is difficult to be immobilized on the substrate.The crystalline TiO2 porous film was prepared d
机械教育是中职教育的重要组成部分,文章阐述了我国当前中职机械教育的状况和存在的新问题,提出了可以通过加大实验环境比重、加强师资队伍建设、确定培养目标、运用现代教育
To investigate the microsegregation phenomena and complex (Ti, Nb)(C, N) precipitation behavior during continuous casting, a unidirectional solidification unit
A novel 70S130Al alloy was prepared by the spray forming process for electronic packaging materials. The effect of the ratio of atomization pressure to metal me