微波烧结与传统烧结对纯钛组织与性能的影响

和熔炼铸造法相比，采用粉末冶金法制备钛材，可以避免引入杂质，提高原料利用率。本文探讨微波烧结与传统烧结对纯钛组织及性能的影响，结果表明，在1200℃保温2 h传统烧结得到等轴α-Ti组织，密度为4.33 g·cm-3，相对密度为96.06%，硬度为HV 260，抗压强度为1309 MPa，断面膨胀率为10.63%，呈典型的解理状脆性断裂；在1200℃保温15 min微波烧结得到等轴的α-Ti与条状β-Ti组织，密度为4.30 g·cm-3，相对密度为95.45%，硬度为HV 311，抗压强度为1175 MPa，断面膨胀率为18.89%，展现出一定的塑性，呈准解理状脆性断裂。

Effects of microwave sintering and conventional sintering on microstructures and properties of pure titanium

Compared with the smelting and casting method, powder metallurgy method can avoid impurities and improve the utilization rate of materials. The microstructures and properties of pure titanium prepared by microwave sintering and conventional sintering were studied in this paper. The results show that, the equiaxed grain α-Ti microstructure is acquired by conventional sintering at 1200 ℃ for 2 h, the relative density, density, hardness, compressive strength, and fracture expansion rate are 96.06%, 4.33 g·cm-3, HV 260, 1309 MPa, and 10.63%, respectively. The conventional sintering titanium samples display the typical cleavage brittle fracture. Furthermore, the equiaxed grain α-Ti and strip β-Ti microstructure are acquired by microwave sintering at 1200 ℃ for 15 min, the relative density, density, hardness, compressive strength, and fracture expansion rate are 95.45%, 4.30 g·cm-3, HV 311, 1175 MPa, and 18.89%, respectively. The microwave sintering titanium samples display the quasi-cleavage brittle fracture.