(1. 成都工具研究所 涂層中心， 成都 610051;
2.四川大學 金屬材料系， 成都 610065)
摘 要: 利用X射線衍射研究了CP3型硬質(zhì)合金涂覆5層(TiC -TiNC-TiC-TiCN-TiN)硬質(zhì)層的組織，用掃描電鏡觀察了涂層的斷口形貌，用劃痕法測定了涂層與基體的結合力，用三點彎曲方法測定了涂覆前后硬質(zhì)合金的抗彎強度，并用Weibull統(tǒng)計方法對其進行了分析。結 果表明：涂層組織由TiC，TiC0.2N0.8和TiN組成，涂層中無發(fā)達的柱狀晶，涂層與基體結合良好，涂覆后硬質(zhì)合金的抗彎強度有所下降，但分散性卻減小。
關鍵字: 硬質(zhì)合金；CVD；結構；抗彎強度；分散性
WC-based hard metal coating
by CVD
GAO Sheng-ji2, YI Yong2
（1.The Center of Coating, Chengdu Tool Institute,
Chengdu 610051, China;
2.Department of Metal Materials, Sichuan University,
Chengdu 610065, China）
Abstract:The microstructures of a cemented carbide with five coated layers by CVD were investigated using XRD. Bonding force between coating and base was measured by scratching. Three-point bending strength was surveyed and its scatter was analyzed by Weibull statistic. Results show that the coating consists of TiC，TiC0.2N0.8 and TiN，there is no developed column crystal in there， bonding between coating and base is very nice，after coating bending strength of the hard metal decreases but its scatter becomes smaller.
Key words: cemented carbide; CVD; coating structure; bending strength; scatter
