Preparation, Microstructure and Property of Ternary Transition Metal Boride Os1-xRuxB2

doi:10.15541/jim20170392

Abstract

Abstract:

Ternary Os_1-_xRu_xB₂ powders were synthesized by using mechanical alloying (MA) technique with Os (Osmium), Ru (Ruthenium) and B (Boron) powders as raw materials. The synthesis process and effect of Ru content on phase composition, and thermal stability of the as-milled powders, and mechanical properties of the samples were studied. X-Ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to study chemical composition and microstructure of the as-synthesized powders and the as-sintered bulk samples. Result showed that Os_1-_xRu_xB_1.1was formed as an intermediate product during the formation process of solid-state reaction of Os_1-_xRu_xB₂from Os, Ru and B powders. After milled for 24 h, the main phase mixture powders were Os_1-_xRu_xB₂ which kept unchanged till milled for 40 h. When x≤0.1, the main phase of the mixture powders was ReB₂-type Os_1-_xRu_xB₂ with hexagonal structure; when x≥0.15, the main phase of the as-milled powders was RuB₂-type Os_1-_xRu_xB₂ with orthogonal structure. After heat treatment at 1450℃ for 1 h, the ReB₂-type Os_1-_xRu_xB₂ partially converted to the orthorhombic phase, while the structure of RuB₂-type Os_1-_xRu_xB₂kept unchanged. The as-sintered OsB₂ and Os_0.85Ru_0.15B₂samples by pressure-less sintering at 1700℃ showed rod-like particles with small pores, the density of the two samples was about 85%, and the micro hardness under a load of 0.49 N was (27±2) GPa and (21±1) GPa, respectively.

Key words: super-hard materials, mechanical alloying, transition metal boride, solid solution

CLC Number:

TQ174

ZOU Can-Hui, LONG Ying, ZHENG Xin, ZHANG Jin-Yang, LIN Hua-Tai. Preparation, Microstructure and Property of Ternary Transition Metal Boride Os_1-_xRu_xB₂[J]. Journal of Inorganic Materials, 2018, 33(7): 787-792.

Figures/Tables 8

Fig. 1 XRD patterns of Os-Ru-B system after high energy ball milling for different time(a) From 4 h to 40 h; (b) 4 h; (c) 40 h

Table 1 Lattice parameters of orthorhombic RuB2 and OsB2

Lattice parameters	a/nm	b/nm	c/nm
RuB₂PDF#15-0213	0.46410	0.28630	0.40440
OsB₂ PDF#17-0370	0.46788	0.28693	0.40724

Fig. 2 SEM image and EDS pattern of Os0.8Ru0.2B2 powders produced by ball milling for 40 h

Fig. 3 TEM images of Os0.8Ru0.2B2 powders produced by ball milling for 40 h

Fig. 4 HRTEM image of Os0.8Ru0.2B2 powders produced by ball milling for 40 h

Fig. 5 XRD patterns of Os-Ru-B system with different contents of Ru after ball milling for 40 h

Fig. 6 XRD patterns of Os1-xRuxB2(x=0, 0.1, 0.2, 0.3) powders after heat-treatement at 1450℃ for 1 h

Fig. 7 SEM images of fractural surface of the OsB2 (a)-(b) and Os0.85Ru0.15B2 (c)-(d) samples after pressureless sintering at 1700℃

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Preparation, Microstructure and Property of Ternary Transition Metal Boride Os_1-_xRu_xB₂

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