权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on Formation of the Composite Coatings by Thermal Spraying

热喷涂复合涂层形成研究

基本信息

批准号：
02555154
负责人：
ITO Hiroshi
金额：
$ 1.98万
依托单位：
Kurume National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

Study on formation of the composite coatings by thermal spraying was done for the purpose of improving the wear resistance of metals. The mild steel substrates were coated with various materials by the wire explosion and plasma spraying methods, and the properties of coatings such as wear resistance, adhesion strength, hardness, etc. were investigated.1. Wire Explosion Spraying (1) The Mo and WC-Co coatings were formed with various discharge energy densities. The parameters such as porosity, etc. were correlated with adhesion strength between the coating a nd substrate. (2) Regarding the WC-Co coatings, it was clarified that the Co content in the coatings was lowered and WC was decarburized to W_<1-x>C, W_2C with increasing in the discharge energy density. (3) The Ni-P alloy was infiltrated into the WC-Co coatings, and then wear resistance of its coating was much improved. (4) The WC-6.5%Co-Mo composite coating had the most excellent wear resistance at the Mo content of 25 vol% when the WC-6.5%Co and Mo wires were exploded and sprayed alternately on the substrate.2. Plasma Spraying (1) The sprayed Al_2O_3 coating was covered with PTFE. The rolling wear test indicated that the PTFE-Al_2O_3 composite coating wore much less than the Al_2O_3 coating. (2) The s prayed WC-Co coating was post-treated with HIP at lower temperature and pressure than ordinary HIP treatment. Wear resistance of the HIP-treated coating was about three times as well as the as-sprayed coating. (3) Ni-Al composite powders were prepared by the mechanofusion process and were sprayed in air or a vacuum. The properties of these powders and coatings were almost the same as those of commercial ones. (4) The WC-12%Co coating was deposited with the aero-plasma s praying torch "Twin Anode alpha". The coating sprayed with the agglomerated powder under optimum conditions showed to have about twice wear resistance compared with the conventional air-plasma sprayed coating.

为了提高金属的耐磨性，对热喷涂复合涂层的形成进行了研究。采用钢丝爆破法和等离子喷涂法在低碳钢表面涂覆不同材料，研究了涂层的耐磨性、结合强度、硬度等性能。丝束爆炸喷涂(1)获得了不同放电能量密度的Mo和WC-Co涂层。孔隙率等参数与涂层与基材的结合强度相关。(2)对于WC-Co涂层，随着放电能量密度的增加，涂层中的Co含量降低，WC脱碳为W_&lt；1-x&Gt；C，W_2C。(3)将Ni-P合金渗入到WC-Co涂层中，涂层的耐磨性大大提高。(4)WC-6.5%Co和Mo丝爆炸交替喷涂时，当Mo含量为25%时，WC-6.5%Co-Mo复合涂层的耐磨性最好。等离子喷涂(1)喷涂后的Al_2O_3涂层表面覆盖了聚四氟乙烯。滚动磨损试验表明，PTFE-Al_2O_3复合涂层的磨损明显小于Al_2O_3涂层。(2)S所祈祷的WC-Co涂层在比普通热等静压处理更低的温度和压力下进行了热等静压处理。热等静压处理涂层的耐磨性是喷涂层的3倍左右。(3)采用机械熔融法制备了Ni-Al复合粉末，并在空气或真空中进行了喷涂。这些粉末和涂料的性能与商业粉末和涂料的性能几乎相同。(4)采用航空等离子S喷枪“双阳极阿尔法”沉积WC-12%Co涂层。在最佳工艺条件下喷涂的涂层耐磨性是常规空气等离子喷涂涂层的2倍左右。