Ti(CN)涂层的宏观应力与破坏方式

RESIDUAL STRESS AND DAMAGE MODE OF HARD Ti(CN) COATING

用Nb-752薄长条做衬底材料,按C_2H_2/N_2分别为3/2和2/3两种气体流量比获得Ti(CN)_(3/2)和Ti(CN)_(2/3)两种涂层,由单面镀膜样品弯曲的曲率半径计算出涂层的宏观残余应力约为2—3GPa,其中热应力占10—20％,涂层与基材界面处应力状态分析表明,界面存在一剪切残留应力并计算大小为0.1—0.2GPa。此外,采用应力圆法分析涂层受力状态,讨论了涂层受外载作用下的破坏方式。

The residual stress of the coating Ti (CN) on Nb-752 alloy was mea-sured using free bending method to be 2-3 GPa in which the thermal stress amount-ed to 10-20%. An analysis on the coating/substrate interface stress shows that theshear stress at it is about 0.1-0.2 GPa. The damage mode of the coating underexternal loading was proposed in terms of the amount and the direction of loading.