本文選題：原位合成 + WC��； 參考：《湘潭大學(xué)》2015年碩士論文

【摘要】：原位自生金屬基復(fù)合材料因具有高比強(qiáng)度,與基體有良好的潤(rùn)濕性和結(jié)合強(qiáng)度,已成為國(guó)內(nèi)外研究的熱點(diǎn)。本文選用廉價(jià)的鎢鐵和石墨作為原位合成WC的鎢源和碳源,采用氬弧焊方法在Q235鋼表面熔覆一層性能優(yōu)良的耐磨涂層。同時(shí)借助光學(xué)顯微鏡、掃描電鏡(SEM)、X射線衍射儀(XRD)、洛氏硬度計(jì)、顯微硬度計(jì)以及磨粒磨損試驗(yàn)機(jī)等實(shí)驗(yàn)儀器,研究了C/W、Si、Mn、外加WC粉末以及預(yù)燒結(jié)處理對(duì)氬弧熔覆原位制備WC顆粒增強(qiáng)涂層組織與性能的影響。研究結(jié)果表明:(1)當(dāng)C/W小于1:1時(shí),涂層中未發(fā)現(xiàn)WC顆粒,涂層中的碳化物主要以Fe3W3C等為主。當(dāng)C/W為1.25:1時(shí),涂層中開(kāi)始生成WC。而當(dāng)C/W為1.5:1時(shí),涂層中的WC含量增加,且分布較為均勻,此時(shí)涂層的耐磨性達(dá)到最佳。(2)合金元素Si對(duì)涂層組織和性能有顯著影響。隨著硅含量的增加,碳原子聚集傾向增大,致使涂層中形成多個(gè)富碳區(qū)域,提高WC的形核率。當(dāng)硅含量為5%時(shí),WC分布較均勻,對(duì)基體構(gòu)成了良好的陰影保護(hù)效果。其相對(duì)耐磨性達(dá)到最高,是基體的58倍左右。而合金元素Mn對(duì)涂層的組織沒(méi)有顯著影響,但對(duì)涂層的性能有明顯作用。隨著錳含量的增加,涂層硬度增加,而涂層的耐磨性則呈先升高后下降的變化規(guī)律。(3)外加WC粉末作為非均勻形核的形核基底,大大增加了原位合成WC的形核率。當(dāng)外加WC含量達(dá)到5%時(shí),原位合成的WC均勻分布在涂層中,其耐磨達(dá)到最佳。而鎢鐵與石墨經(jīng)過(guò)預(yù)燒結(jié)后,鎢鐵表面吸附有大量的石墨,從而使得存在多個(gè)富碳區(qū)域。在電弧反應(yīng)過(guò)程中,涂層中生成了大量的WC顆粒且均勻分布于涂層中上部,涂層耐磨性大大提高。
[Abstract]:In-situ in-situ metal matrix composites with high specific strength, good wettability and bonding strength with the matrix have become a hot research topic at home and abroad. In this paper, cheap iron tungsten and graphite are used as tungsten and carbon sources for in-situ synthesis of WC. An excellent wear-resistant coating is cladding on Q235 steel by argon arc welding. At the same time, with the help of optical microscope, scanning electron microscope, SEMU X-ray diffractometer, Rockwell hardness tester, microhardness meter and abrasive wear tester, etc. The effects of C / W / Si Si mn, WC powder and pre-sintering on the microstructure and properties of in-situ prepared WC particle reinforced coatings by argon arc cladding were investigated. The results show that when the C / W is less than 1:1, no WC particles are found in the coating, and the carbides in the coating are mainly Fe3W3C and so on. When C / W is 1. 25: 1, WC is formed in the coating. When the C / W is 1.5: 1, the WC content in the coating increases and the distribution is more uniform, and the wear resistance of the coating reaches the best. The alloy element Si has a significant effect on the microstructure and properties of the coating. With the increase of silicon content, the tendency of carbon atom aggregation increases, resulting in the formation of many carbon-rich regions in the coating, and the nucleation rate of WC is increased. When the silicon content is 5, the WC distribution is more uniform, and it has a good shadow protection effect on the matrix. Its relative wear resistance is the highest, about 58 times of the matrix. The alloy element mn has no significant effect on the microstructure of the coating, but has obvious effect on the properties of the coating. With the increase of manganese content, the hardness of the coating increases, while the wear resistance of the coating increases first and then decreases. The addition of WC powder as the nucleation substrate of heterogeneous nucleation greatly increases the nucleation rate of in-situ synthesized WC. When the content of WC in the coating reaches 5, the WC synthesized in situ is uniformly distributed in the coating, and the wear resistance is the best. After presintering, there are a lot of graphite adsorbed on the surface of ferric tungsten and graphite, which leads to the existence of many carbon-rich regions. During the arc reaction, a large number of WC particles were formed in the coating and distributed uniformly in the middle and upper parts of the coating. The wear resistance of the coating was greatly improved.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG174.4

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