专利详情

专利名称	Ai203 dispersion-strengthened ti2ain composites and a method and producing the same
申请号	US20050629559	专利类型	US
公开（公告）号	US2007179040	公开（授权）日	2007.08.02
申请（专利权）人	中国科学院金属研究所	发明（设计）人	LI JUYING (CN);CUI YUYOU (CN);YANG RUI (CN)
主分类号	C04B35/582	IPC主分类号	C04B35/582;C04B35/58;C04B35/581
专利有效期	Ai203 dispersion-strengthened ti2ain composites and a method and producing the same 至Ai203 dispersion-strengthened ti2ain composites and a method and producing the same	法律状态
说明书摘要	The invention provides Al2O3 dispersion-strengthened Ti2AlN composites, wherein Ti2AlN matrix and Al2O3 strengthening phase both are reactively formed in situ. The volume fraction of Al2O3 is 5% to 50%; the particle size of Al2O3 ranges from 500 nm to 2 mum, with the mean size of Al2O3 particles about 0.8 mum to 1.2 mum; the shape of Ti2AlN grain is plate-like about 80 nm to 120 nm thick and 0.5 mum to 2 mum long. The composites exhibit excellent deformability at high temperature under compression and flexure stresses, and possess excellent oxidation resistance at 1100 DEG C. to 1350 DEG C. for long time (100 h). The composites show typical metallic conductor behavior and the electrical resistivity at room temperature is 0.3 to 0.8 muOmega.m. The invention also provides a method for preparing the same: First, nanoparticles in Ti-Al binary system were prepared in continuous way by hydrogen plasma-metal reaction (HPMR) using Ti-Al alloy rods with Al content 20% to 60% by atom, or pure Al rods and pure Ti rods. The atmosphere used in HPMR is the mixture atmosphere of nitrogen-containing gas, H2 and Ar, with total pressure of 0.8 to 1.2 atm, wherein volume ratio of H2 and Ar is 1:0.8-1.2, and volume fraction of nitrogen-containing gas is 0 to about 20%. Second, the nanoparticles were compacted by vacuum hot pressing at temperature of 800 DEG C. to 1200 DEG C., pressure of 40 MPa to 60 MPa, time of 4 h to 6 h, and vacuum of 2x10<-2 >Pa to 5x10<-3 >Pa.