Air treatment of pure titanium by furnace and glow-discharge processes
Air treatment of pure titanium by furnace and glow-discharge processes
复制标题
DOI：
10.1016/s0257-8972(01)01164-1
复制
发表时间：
2001-06-04
影响因子：
5.4
通讯作者：
Bacci, T
中科院分区：
文献类型：
--
作者：
Borgioli, F;Galvanetto, E;Bacci, T
钛的高亲氧性可用于提高钛及钛合金零件的表面硬度和耐磨性。本文比较了以空气为处理气氛的辉光放电处理和电炉处理对工业纯钛组织和性能的影响。两种处理方式在973和1173K下分别处理0.5、2和4h，均可获得表面改性层：外层(化合物层)主要由TiO2和少量TiNxOy组成，而内层(扩散层)由富含间隙原子的ol-Ti晶体组成。结果表明，等离子处理比电炉处理更有效地硬化钛表面：在相同的处理温度和时间下，等离子处理的样品具有更厚的硬化层，其硬化值也比熔炉处理的样品高。还对α-Ti固溶体进行了结晶学表征，并估算了a，c晶格参数。等离子体处理的样品的晶格参数和c/a值比加热处理的样品大，表明等离子体处理的样品中间隙原子的浓度更高。(C)2001 Elsevier Science B.V.保留所有权利。
The high oxygen affinity of titanium can be used to improve the surface hardness and wear resistance of titanium and titanium alloy components by means of thermal treatments. In the present paper a comparison of the effects of glow-discharge and furnace processes, carried out using air as treatment atmosphere, on the microstructure and mechanical properties of commercially pure titanium samples is reported. Both treatment types, performed at 973 and 1173 K for 0.5, 2 and 4 h, produce modified surface layers: the outer layer (compound layer) consists essentially of TiO2 and small amounts of TiNxOy, while the inner layer (diffusion layer) consists of ol-Ti crystals rich in interstitial atoms. The plasma treatment is shown to be more efficient in hardening titanium surface layers than the furnace process: by using the same treatment temperature and time, plasma treated samples have a thicker hardened layer, with higher hardness values that the furnace treated ones. A crystallographic characterisation of the alpha -Ti solid solution has also been performed and the a, c lattice parameters have been evaluated. Plasma treated samples show larger lattice parameters and c/a values than the furnace treated samples, suggesting a higher concentration of interstitial atoms due to the plasma treatment. (C) 2001 Elsevier Science B.V. All right reserved.