【摘要】：大量的零件和設(shè)備由于磨損而失效,造成了極大的損失。多種表面技術(shù)已經(jīng)成功應(yīng)用到解決表面磨損的問(wèn)題。而高接觸應(yīng)力下工件表面的磨損問(wèn)題解決方案較少,如軋輥表面的修復(fù)與強(qiáng)化。因此解決此問(wèn)題具有重要的經(jīng)濟(jì)價(jià)值。通過(guò)電刷鍍和電接觸強(qiáng)化技術(shù)制備了高性能的冶金結(jié)合鍍層,得到了缺陷較少的Ni-P合金鍍層和Ni-P/Cr_3C_2復(fù)合鍍層。Ni-P合金鍍層硬度為780.79HV0.1,熱震時(shí)裂紋開(kāi)始出現(xiàn)次數(shù)為80,鍍層開(kāi)始出現(xiàn)剝落次數(shù)為105;Ni-P/Cr_3C_2復(fù)合鍍層硬度為850.90HV0.1,熱震時(shí)裂紋開(kāi)始出現(xiàn)次數(shù)為83,鍍層開(kāi)始出現(xiàn)剝落次數(shù)為128。對(duì)Ni-P合金鍍層工藝優(yōu)化和Ni-P/Cr_3C_2復(fù)合鍍層預(yù)鍍層制備技術(shù)進(jìn)行研究,得到的Ni-P合金預(yù)鍍層的硬度達(dá)到582.46HV0.1,Ni-P/Cr_3C_2復(fù)合預(yù)鍍層硬度達(dá)到662.97 HV0.1,鍍層厚度為150um,且與基體分界明顯,但鍍層上存在一些孔洞和裂紋,有待于進(jìn)一步提高。對(duì)Ni-P鍍層進(jìn)行工藝優(yōu)化,當(dāng)溫度是35℃,電壓是12V時(shí),Ni-P鍍層的硬度和厚度相對(duì)較好,電刷鍍后的Ni-P鍍層的硬度達(dá)到582.46HV0.1;通過(guò)行星球磨機(jī)制備Cr_3C_2顆粒,綜合機(jī)械分散,超聲波分散和活性劑分散的方法,制備出分散性能良好的Ni-P/Cr_3C_2鍍液。并且探索出在20g/l時(shí),鍍層的硬度達(dá)到最大值662.97HV0.1;同時(shí)電刷鍍的工藝具有穩(wěn)定性和重復(fù)性,Ni-P和Ni-P/Cr_3C_2預(yù)鍍層與基體分界明顯,但鍍層上存在一些孔洞和裂紋,且基體和鍍層屬于機(jī)械結(jié)合,因此有待于進(jìn)一步提高。利用電接觸技術(shù)強(qiáng)化預(yù)鍍層,對(duì)電接觸強(qiáng)化后的Ni-P合金鍍層和Ni-P/Cr_3C_2復(fù)合鍍層進(jìn)行進(jìn)一步的研究。經(jīng)過(guò)電接觸強(qiáng)化后,Ni-P鍍層和Ni-P/Cr_3C_2鍍層上的缺陷減少,鍍層和基體界面發(fā)生熔合,硬度分別提高到780.79HV0.1和850.90HV0.1;通過(guò)元素線掃描分析可知,電接觸強(qiáng)化使鍍層與基體的結(jié)合方式發(fā)生變化,從機(jī)械結(jié)合變成冶金結(jié)合;通過(guò)XRD進(jìn)一步分析可知,電接觸強(qiáng)化使鍍層析出了新相Ni3P,而且細(xì)化了晶粒,可能導(dǎo)致了硬度的提高;通過(guò)熱震性分析可知,經(jīng)過(guò)電接觸強(qiáng)化后,熱震性提高。
[Abstract]:A large number of parts and equipment have failed due to wear and tear, resulting in a great loss. A variety of surface techniques have been successfully applied to solve the problem of surface wear. However, there are few solutions to the wear of workpiece surface under high contact stress, such as the restoration and strengthening of roll surface. Therefore, solving this problem has important economic value. Ni-P alloy coating and Ni-P/Cr_3C_2 composite coating with fewer defects were prepared by brush plating and electrical contact strengthening. The hardness of Ni-P alloy coating was 780.79HV0.1, and the hardness of Ni-P alloy coating was 780.79HV0.1, and the hardness of Ni-P alloy coating was 780.79HV0.1, During thermal shock, the number of cracks appearing at first is 80, and the number of spalling of coating begins to appear is 105; The hardness of Ni-P/Cr_3C_2 composite coating is 850.90 HV0.1, the number of cracks appearing in thermal shock is 83, and the number of spalling in coating is 128. The technological optimization of Ni-P alloy coating and the preparation technology of Ni-P/Cr_3C_2 composite coating were studied. The hardness of Ni-P alloy preplating layer reached 582.46HV0.1, The hardness of Ni-P/Cr_3C_2 composite precoating is up to 662.97 HV0.1, the thickness of the coating is 150um, and the boundary between the coating and substrate is obvious, but there are some holes and cracks on the coating, which need to be further improved. The process of Ni-P coating is optimized. When the temperature is 35 鈩，

本文編號(hào)：2466578