Abstract
The compaction mechanism of titanium hydride powder is an important issue because it has a direct impact on density and strength of green compacts and ultimately on the physical and mechanical properties of a final sintered products. In this paper, the characteristics and compaction behavior of titanium hydride and hydrogenation-dehydrogenation titanium powders are comparatively studied and analyzed for better understanding of compaction mechanism of brittle low-strength titanium hydride. The results indicate that the particles of titanium hydride powder are easily crushed under compaction loading at relatively low pressure well below compression strength of bulk titanium hydride, the degree of particle crushed increases with the increase of pressure. The compaction behavior of titanium hydride powder mainly includes the rearrangement and crushing of particles in the early compaction stage, minor plastic deformation, if any, and further rearrangement of particle fragments with filling the pores in the later stage. Such compaction behavior provides relative density of green hydride compacts higher than that for titanium powder of the same size. The relatively coarse titanium hydride powder with wide particle size distribution is easier to fill the pores providing highest green density.
Highlights
As one of the important metal materials in civil industry and national defense industry, titanium and titanium alloys have a series of excellent properties, such as low density, good welding performance, high specific strength and stiffness, no magnetism, excellent creep and fatigue strength, good corrosion resistance and heat resistance, enough fracture toughness, and excellent biocompatibility, which are widely used in aerospace industry, shipbuilding, marine engineering, petrochemical, automotive, armor, and biomedical fields [1,2,3,4]
The powder metallurgy (PM) is an ideal process for producing high-performance titanium alloys at reduced cost, which has a good development prospect. e simplest and, cheapest powder metallurgy process consists of cold compaction and vacuum sintering of powders or powder blends [7]
The cold compaction ability of titanium powders and the relationships between characteristics of green titanium compacts and their densification behavior have become the important subject of numerous studies
Summary
Shucheng Dong ,1,2 Baicheng Wang, Yuchao Song, Guangyu Ma, Huiyan Xu, Dmytro Savvakin, and Orest Ivasishin. E compaction behavior of titanium hydride powder mainly includes the rearrangement and crushing of particles in the early compaction stage, minor plastic deformation, if any, and further rearrangement of particle fragments with filling the pores in the later stage. Such compaction behavior provides relative density of green hydride compacts higher than that for titanium powder of the same size. E relatively coarse titanium hydride powder with wide particle size distribution is easier to fill the pores providing highest green density Such compaction behavior provides relative density of green hydride compacts higher than that for titanium powder of the same size. e relatively coarse titanium hydride powder with wide particle size distribution is easier to fill the pores providing highest green density
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