Preparation of diamond coated cutting tool with long life and its machinability against hard work material

长寿命金刚石涂层刀具的制备及其对难加工材料的切削性能

基本信息

批准号：
12555248
负责人：
ITOH Hideaki
金额：
$ 7.74万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

The Preparation of adherent diamond coating on tools is one of the urgent subjects to be investigated to develop long life and precise cutting tool for hard work materials. Diamond with high hardness and high thermal conductivity, however, has low adherence against most substrate materials because of its own strong sp^3 covalent bonding. Excellently, adherent diamond coating technique was established in the present paper and its cutting property was evaluated as well as the machinability against hard work materials. The main results and conclusions in the project term were summarized as follows.1. Preparation of CVD diamond coating on silicon nitride tool and its machinabilityAdherent diamond coating was performed on silicon nitride substrate by the two-stage microwave plasma CVD in the CO-H_2 reactant system. A graded structure from sp^3 to sp^2 bonding was formed by a careful pretreatment of the substrate and subsequent thick diamond coating. Excellent adherence was verified by the a … More ctual cutting test against Al-20wt% Si alloy work. Detailed X-ray analysis of the residual stress between diamond film and substrate indicated that the relaxation of inner stress in the diamond film occurred on account of the formation of the graded structure.2. Preparation of CVD diamond coating on cemented carbide tool and its machinabilityAdherent diamond coating on cemented carbide substrate has been desired for its expansion to more versatile application. However, the adherence of diamond film to cemented carbide is too weak to bear the large stress in hard cutting conditions. Prior to diamond coating, electrochemical etching of cobalt phase on the surface layer was carried out to depress the graphitized carbon solution into cobalt and to increase the adherence by increasing contact area between diamond and substrate. Peeling of diamond film was prevented, even though the adherence strength was insufficient under hard cutting conditions. Further investigation is required for better adherence achieved. Less

对紧急受试者进行粘附涂层的准备，以开发长时间的工作材料，以钻石材料，并具有高度的导电性，但是，对大多数材料的依从性很低。 3个粘合性通过仔细预测底物和厚度厚的钻石涂层。钻石膜发生在形成的结构中。2CVD钻石涂层在碳化物工具ATS ATS MachinabilityAdherenthenthenthentherabilentabilentherentherenthent Hereadent钻石涂层上，在碳化物基质上涂层使Beens Fored Fored Fored Fots Fots IT IT IT IT IT IT IN IT ION的粘附钻石的碳化物是在硬切割条件下承受较大的应力，将表面层的钴相，钴相位的电化学等，以将石墨化的碳溶液降低到钴酸盐中在艰苦的条件下，需要进一步的投资。