Abstract
Porous titanium samples with a porosity of 1.34~15.54% were prepared by a spark plasma sintering (SPS) process at sintering temperatures of 800 °C, 850 °C and 900 °C, and a sintering pressure of 10 MPa. The microstructures and fracture morphology of the samples were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses. The compressive strength and elastic modulus were likewise measured. The results showed that no new phase occurred after the samples were sintered, and the main phases were α phase of hcp structure. The porosity of the samples decreased significantly with the increase of sintering temperature. At 800 °C, the sample phase was dominated by equiaxed α. There were more irregular coarse pores in the samples. At 850 °C, the microstructure was mainly zigzag α, and the pores were finely and relatively uniform in distribution. At 900 °C, the sample’s structure transformed into a dense sheet-like α. The sample’s densities increased and the pores disappeared. The room temperature compression test showed that the porous titanium sintered by SPS had excellent compressive strength. The yield strength, compressive strength, compressive strain and elastic modulus were 81.85~122.36 MPa, 161.65~498.86 MPa, 36.75~59.97% and 2.79~4.22 GPa, respectively.
Highlights
Triton (T) and deuterium (D) are important thermonuclear fusion materials
Spherical titanium powder (45~180 μm) prepared via plasma rotating electrode process (PREP) was used as raw material, and porous titanium with low porosity was prepared by spark plasma sintering (SPS) method at different sintering temperatures (800 ◦ C, 850 ◦ C and 900 ◦ C)
It can be seen that the phase composition of the sample under different sintering parameters consist of only a single hcp structure of the α-Ti phase, and no abnormal diffraction peak is observed
Summary
Triton (T) and deuterium (D) are important thermonuclear fusion materials. The thermonuclear fusion reaction energy of T and D, and the safe storage of nuclear components of T storage are extremely important in the field of national defense security [1,2]. The SPS technology is expected to produce porous titanium with more fine grains, many grain boundaries, high specific surface area, and excellent mechanical properties. It presents a new idea for the preparation of porous titanium with an interfacial structure effect and raises the critical threshold of T and H material storage [19]. Spherical titanium powder (45~180 μm) prepared via plasma rotating electrode process (PREP) was used as raw material, and porous titanium with low porosity was prepared by SPS method at different sintering temperatures (800 ◦ C, 850 ◦ C and 900 ◦ C). The phase composition, porosity, microstructure, compression properties and fractures morphology of the sintered product were evaluated
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