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Duplex Surface Treatment due to Combined Plasma Nitriding and Ceramic or Cermet Thick Coatings of Cr-Ni-N System

等离子渗氮与 Cr-Ni-N 系陶瓷或金属陶瓷厚涂层相结合的双重表面处理

基本信息

批准号：
08555174
负责人：
YASUMARU Naoki
金额：
$ 1.6万
依托单位：
Fukui National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555174/
关键词：
plasma treatment nitriding ceramic coating suraface treatment chromium nitride duplex treatment

项目摘要

Austenitic type 304 stainless steel was duplex treated by ion-nitriding at about 803 K and subsequent ion-plating of Cr-N or CrNi-N.The nitride films of Cr-N or CrNi-N were deposited in the pure N_2 or N_2-H_2 mixed gas at about 2.5 Pa with a film thickness of 3-34mum. The following results are obtained.(1) As for the Cr-N system, the phase composition was a single phase of CrN or the mixed phases of Cr_2N and Cr. As for the CrNi-N system, it was the mixed phases of Cr^<**>N and Ni. Cr^<**>N was newly obserbed Cr nitride which may contain some Ni and identified as an f.c.c.structure (a=0.37 nm).(2) The film hardness was about Hv 1900 for Cr-N and about Hv 1000 for CrNi-N.The depositing rate of the CrNi-N film was faster than that of Cr-N,but the surface roughness was larger.(3) The ceramic flims of CrN coated onto the pre-nitrided steel showed the best wear resistance even under a heavy load. Among the CrN films of 3,10 and 19 mum, the CrN film with a thickness of 10 mum showed the minimum wear loss and the wear loss of CrN film with a thickness of above 10 mum coated onto the untreated steel decreased nearly to that of CrN film coated onto the prenitrided steel.(4) The cermet films of CrNi-N coated onto the untreated steels show the good wear resistance and these films coated onto the pre-nitrided steels exhibet the inferior wear resistance compared with ones coated onto the untreated steels, being contrary to the tendency of the common ceramic films like as CrN.

对奥氏体304不锈钢进行了803 K左右离子渗氮处理，然后离子镀Cr-N或CrNi-N。在纯N_2或N_2-H_2混合气体中，压力约为2.5 Pa，沉积了Cr-N或CrNi-N氮化膜，膜厚为3～34mum。得到如下结果：(1)Cr-N系的物相组成为CrN单相或Cr_2N与Cr的混合相。对于CrNi-N体系，它是Cr^<**>N和Ni的混合相。 Cr^<**>N是新观察到的Cr氮化物，可能含有一定的Ni，为f.c.c.结构（a=0.37 nm）。（2）Cr-N薄膜硬度约为Hv 1900，CrNi-N薄膜硬度约为Hv 1000。CrNi-N薄膜的沉积速率比Cr-N快，但表面粗糙度较大。（3）CrN陶瓷薄膜即使在重负载下，涂覆在预氮化钢上的涂层也显示出最佳的耐磨性。在3、10和19μm的CrN膜中，厚度为10μm的CrN膜的磨损量最小，未处理钢上涂覆10μm以上厚度的CrN膜的磨损量几乎接近于预氮化钢上涂覆的CrN膜的磨损量。(4)未处理钢上涂覆的CrNi-N金属陶瓷膜表现出良好的耐磨性，在未处理钢上涂覆的CrNi-N金属陶瓷膜显示出良好的耐磨性。与未经处理的钢上涂覆的钢相比，预氮化钢的耐磨性较差，这与普通陶瓷膜（如 CrN）的趋势相反。