抑制劑對(duì)WC-Co硬質(zhì)合金涂層性能的影響
本文關(guān)鍵詞: 晶粒長(zhǎng)大抑制劑 超細(xì)WC-Co復(fù)合粉 硬質(zhì)合金涂層 耐磨性 耐蝕性 出處:《無(wú)機(jī)材料學(xué)報(bào)》2017年08期 論文類型:期刊論文
【摘要】:利用原位還原碳化反應(yīng)合成的超細(xì)WC-12Co復(fù)合粉末作為原料,分別添加1.0wt%晶粒長(zhǎng)大抑制劑即VC、Cr3C2和Nb C,經(jīng)團(tuán)聚造粒和超音速火焰(HVOF)噴涂制備了超細(xì)結(jié)構(gòu)的硬質(zhì)合金涂層。研究了不同晶粒長(zhǎng)大抑制劑對(duì)涂層的顯微組織結(jié)構(gòu)、物相、硬度、耐磨性能和耐蝕性能的影響。結(jié)果表明,與未添加晶粒長(zhǎng)大抑制劑涂層相比,添加1.0wt%VC或Cr_3C_2制備的硬質(zhì)合金涂層中WC顆粒的平均尺寸降低了約49%,涂層硬度明顯提高,磨損速率降低了約52%~55%。添加1.0wt%Nb C對(duì)制備涂層中WC顆粒尺寸的抑制作用不明顯,Co粘結(jié)相中由于形成了(W,Nb)C化合物,其耐蝕性獲得顯著提高,但該化合物脆性大,導(dǎo)致涂層耐磨性不及添加VC和Cr3C2制備的涂層。
[Abstract]:The superfine WC-12Co composite powder synthesized by in-situ reduction and carbonation reaction was used as raw material, and 1.0 wt% grain growth inhibitor, VCnCr3C2 and NB C, were added respectively. Ultrafine cemented carbide coatings were prepared by agglomeration and HVOF spraying. The microstructure, phase and hardness of the coatings with different grain growth inhibitors were studied. The effect of wear resistance and corrosion resistance. The results show that compared with the coating without grain growth inhibitor. The average size of WC particles in the cemented carbide coating prepared by adding 1.0 wtVC or Cr_3C_2 decreased by about 49 and the hardness of the coating increased obviously. The wear rate is reduced by about 52% and 55%. The inhibition of WC particle size in the coating by adding 1.0 wtNbC is not obvious because of the formation of W / W in the Co bonded phase. The corrosion resistance of Nb)C compound was significantly improved, but the brittleness of the coating was higher than that of the coating prepared by adding VC and Cr3C2, and the wear resistance of the coating was lower than that of the coating prepared by adding VC and Cr3C2.
【作者單位】: 北京工業(yè)大學(xué)材料科學(xué)與工程學(xué)院新型功能材料教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家“863”計(jì)劃主題項(xiàng)目(2013AA032001) 北京市自然科學(xué)基金重點(diǎn)項(xiàng)目(2131001);北京市自然科學(xué)基金(2154045)~~
【分類號(hào)】:TG174.4
【正文快照】: 863 Prograns(2013AA032001);Natural Science Foundation of Beijing(2131001,2154045)WC-Co類涂層具有較高的硬度和優(yōu)良的耐磨性,在航空航天、汽車、船舶、石油化工、機(jī)械制造、電力、印刷等領(lǐng)域得到廣泛應(yīng)用[1-4]。研究發(fā)現(xiàn)[5-9],超細(xì)/納米粉末具有特殊的小尺寸效應(yīng)和表面
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