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Self-reactive spray forming Ti (C, N)-TiB2 composite ceramic blank into the reaction mechanism


To avoid the follow-up with electrical processing in the distortion: the use of ultra-low temperature treatment process, improve the wear resistance of the mold 2 to 3 times. Thus greatly extending the life of mold. Tin (Continued from page 29) the rapid increase in temperature, 536 ℃ when the surface began to be part of the B4C oxidation; 882 ℃ Ti occurs when the phase transition from the solid phase to B phase transition. Almost at the same time the oxidation and nitridation reaction of Ti also the beginning; temperature to 1085 ℃, the composite powder surface part of the Ti and B4C oxidation and nitride oxide has been basically completed. At 1085 ℃, the low melting point oxide B2O oxidation of volatile and loss of C so that weight loss system. To 1265 ℃ atomic diffusion within the composite powder intense,[link widoczny dla zalogowanych], local emergence Ti, C between the solid state diffusion reaction. To which the low melting point 1660 ℃ when the group begins to melt Ti element. Composite powder accumulation of internal heat due to continuous increase due to atomic diffusion and the emergence of a large number of liquid, so the Lord began to violent reaction occurs to produce TiC and TiB, in which the former product of TiN and Ti nitride solid solution reaction occurs carbonitride stable phase of titanium TiC. 3N their solid solution. After the composite powder inside the main reaction and side effects common persists,[link widoczny dla zalogowanych], continue to consume the product of reactant phase content increased. C and B4C oxidation loss of the Ti part of the composite powder over, this part of the spray deposition process of Ti in the matrix due to the collision, deformation, spreading and then increases the contact area with air and is oxidized to TiO, left in the spray deposited billets Parts by References: [1] ZhuChuncheng, Zhangxinoong, HeXiaodong, eto1. Self-propagatinghigh-temperaturesynthesis, microstructureandmechanicalpropertiesofTjC-TiB2 a Cucomposites [J]. J. ofMaterialScienceandTechnology, 2006,22 (1) :78-82. [2] ZhaoHong,[link widoczny dla zalogowanych], ChengYibing. FormationofTiB2 a TiCcompositeyreactivesintering [J]. CeramicsInternational, 1999,25 (1) :353-357. [3] LeeJW, MunirZA, OhyanagiM. DensenanocrystallineTiB2 a TiCcompositesformedbyfieldactivationfi'omhigh-energyballmilledreactants [J】. MaterialsScienceandEngineering, 2002,[link widoczny dla zalogowanych],325 (3) :221-227. [4】 Jian-Jiang Wang, Du Xinkang, Liu Hongwei, et al. TjC-Tj SHS composite ceramic coatings prepared by reactive flame spraying [J]. Composite Materials, 2006,23 (4) :100-105. [5] Jianxin Tang, Zeng Qiang, Hu Xiaoqing, et al. In situ synthesis of TiB:. TjC ceramic matrix composites [J]. Materials Engineering ,2001,2:19-21. [6] Zhu Spring City, Qu Wei, Zhang Xing, et al. TiC. TiB: Progress in composite materials [J]. Materials Review, 2003,17 (1) :48-51. [7】 Tangai Tao. Preparation with ilmenite Ti (C, N) composites to control and process optimization [D]. Chongqing: Chongqing University, 2004. [8] Jian-Jiang Wang, Du Xinkang, Liu Hongwei, et al. Al of the reactive flame spraying TiC-TiB: Composite Preparation of ceramic coatings [J]. Inorganic Materials, 2007,22 (5) :550-554. [9] Yeda Lun, Hu Jianhua. Practical inorganic thermodynamics Manual (2nd Edition) IM]. Beijing: Metallurgical Industry Press. 2002. [10] Dong Limin,[link widoczny dla zalogowanych], Zhang Baoqing, Jie Mo Tian, et al. Carbon-ceramic composite antioxidant properties [J]. Tsinghua University, 1997,37 (5) :106-109. [11] Wu Zhen dry, Gu Ming-yuan, Zhang set. The oxidation properties of boron carbide [J]. Inorganic Materials, 1997,12 (3) :370-374. Tin 114HotWorkingTechnology2008, Vo1.37, No. 6

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