摘要
在铝酸盐溶液中，采用交流微弧氧化方法在ＴＣ４钛合金表面制备出氧化物陶瓷膜．使用显微力学探针测定了膜的硬度和弹性模量分布，并探讨了微弧放电对氧化膜和钛合金基体组织、性能的影响．结果表明，钛合金表面经微弧氧化处理后，膜／金属界面附近钛合金基体显微组织保持不变，基体上也不存在硬化区．另外，来自溶液氧原子没有扩散进入未氧化的钛合金基体．氧化膜的显微硬度和弹性模量分布有相似的变化规律．从膜表层到膜内部，硬度和弹性模量逐渐增加．靠近钛／膜界面附近时达到最大值。分别为１３和２３０ＧＰａ膜不同深度处ＴｉＯ２金红石和ＴｉＡｌ２Ｏ５尖晶石相的相对含量变化决定了硬度和弹性模量分布．
An oxide coating on TC4 Titanium alloy was prepared in an aluminate solution by the alternating-current microarc oxidation (MAO) method. The microhardness (H) and elastic modulus (E) of the MAO ceramic coating were determined by the mechanical properties microprobe. The influence of microarc discharge on microstructure and properties of the coating and alloy substrate were discussed. The microarc discharge process has hardly influence on the microstructure of the alloy substrate. No oxygen atoms from the solution diffuse into the unoxidized titanium substrate. The hardness and elastic modulus profiles of the MAO coating are similar. From the coating surface to the interior of the coating, H and E gradually increase. H and E can reach maximum values of 13GPa and 230GPa respectively in the coating near the interface. The changes in relative contents of TiO2 rutile and TiAl2O5 spinel along the coating thickness determine H and E profiles in the coating.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第2期326-331,共6页
Journal of Inorganic Materials
基金
国家自然科学基金青年基金(59801003)
国家"863"计划(715-011-020)
北京市科技新星计划(955810
