(1. 水利部產(chǎn)品質(zhì)量標準研究所，杭州 310012；
2. 浙江省水利水電裝備表面工程技術(shù)研究重點實驗室，杭州 310012；
3. 水利機械及其再制造技術(shù)浙江省工程實驗室，杭州 310012；
4. 水利部杭州機械設(shè)計研究所，杭州 310012)
摘 要: 采用X射線衍射儀(XRD)、掃描電鏡(SEM)、顯微硬度計、摩擦磨損試驗機、沖蝕試驗機等手段研究高溫及氧化對超音速噴涂WC-10Co4Cr涂層的顯微組織、顯微硬度、結(jié)合強度、耐磨性能、耐沖蝕性能等的影響。結(jié)果表明：在空氣中經(jīng)600℃熱處理后，涂層發(fā)生了明顯的高溫氧化，涂層中WC、Co、Cr相的含量降低，轉(zhuǎn)化為CoWO4、Cr2O5、C6WO6等氧化物相，孔隙率明顯升高，結(jié)合強度有所降低，雖然涂層的顯微硬度值有所提高，但耐磨損及耐沖蝕性能都明顯降低；通過Ar保護，涂層只受到600℃的高溫作用，涂層的相組成未發(fā)生明顯改變，顯微硬度有較大幅度的提高，且分布更加均勻，耐干摩擦磨損及耐泥沙沖蝕性能均獲得大幅提高。
關(guān)鍵字: WC-10Cr4Cr涂層；高溫；氧化；微觀結(jié)構(gòu)；性能
（1. Standard and Quality Control Research Institute, Hangzhou 310012, China;
2. Hydraulic Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province, Hangzhou 310012, China;
3. Hydraulic Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province, Hangzhou 310012, China;
4. Hangzhou Mechanical Research Institute, Hangzhou 310012, China）
Abstract:The effects of temperature and oxidation on the microstructure, microhardness, binding strength, wear resistance, corrosion wear resistance of high velocity sprayed WC-10Co4Cr coatings were investigated by using X-ray diffraction (XRD), scanning electron microscopy (SEM), microhardness measurement, wear testing machine and wear corrosion testing machine. The results show that the coatings are high temperature oxidized obviously after heat treatment at 600 ℃ in air. WC, Co, Cr content are reduced and converted into CoWO4, Cr2O5, C6WO6, and so on, the porosity of coatings increases significantly, the bonding strength reduces. Although the microhardness value of the coatings increases, but the wear resistance and corrosion wear resistance reduce significantly. The coatings is only subjected at high temperature of 600 ℃ in Ar, the microstructures of the coatings do not change obviously, the microhardness is improved by large margin and distributes more uniformly, the wear resistance and corrosion wear resistance are improved by large margin.
Key words: WC-10Co4Cr coatings; high temperature; oxidation; microstructure; properties
