電接觸強(qiáng)化預(yù)涂層的制備
本文選題:粘結(jié)技術(shù) 切入點(diǎn):電接觸強(qiáng)化 出處:《東華大學(xué)》2017年碩士論文 論文類型:學(xué)位論文
【摘要】:目前磨損失效導(dǎo)致設(shè)備報(bào)廢的問題相當(dāng)嚴(yán)重,據(jù)統(tǒng)計(jì)損壞設(shè)備中大約有70%~80%的設(shè)備產(chǎn)生了磨損失效的問題。由此可見,重視資源的充分利用節(jié)約材料,加強(qiáng)抗磨技術(shù)的研究,提高材料抗磨性能降低磨損的工作顯得尤為重要。本論文研究內(nèi)容為探索一種簡單高效、成本低廉、涂層質(zhì)量優(yōu)越的硬質(zhì)涂層制備技術(shù),具體方法為采用粘結(jié)劑與合金粉末混合成漿料刮涂在工件表面制成預(yù)涂層,然后進(jìn)行電接觸強(qiáng)化來獲得高性能涂層。首先,分別采用硅酸鹽類粘結(jié)劑、低熔點(diǎn)金屬粘結(jié)劑焊錫膏、熱固性環(huán)氧樹脂粘結(jié)劑與合金粉末混合制備預(yù)涂層再進(jìn)行電接觸強(qiáng)化,得出預(yù)涂層采用熱固性環(huán)氧樹脂粘結(jié)劑與合金粉末混合制成效果最好;之后又對使用熱固性環(huán)氧樹脂粘結(jié)劑制備的預(yù)涂層進(jìn)行了性能改善,在漿料刮涂在工件表面后覆蓋合金粉末的方法增強(qiáng)了預(yù)涂層的導(dǎo)電性;通過實(shí)驗(yàn)確定了粘結(jié)劑與合金粉末的最佳配比為1:2;預(yù)涂層制備好后在烘干爐中烘干的方法解決了預(yù)涂層固化不完全的問題;然后對電接觸強(qiáng)化的工藝進(jìn)行了改進(jìn),包括預(yù)緊力的設(shè)置、預(yù)熱處理、電接觸強(qiáng)化電流的設(shè)置、主軸轉(zhuǎn)速與進(jìn)給速度的設(shè)置;分別電接觸強(qiáng)化多種合金粉末預(yù)涂層,得出電接觸強(qiáng)化Ni60-WC預(yù)涂層的效果最好;對強(qiáng)化后涂層進(jìn)行了微觀組織觀察、涂層與基體交界處元素線掃描、顯微硬度的測試,通過分析,涂層組織致密,夾生與孔洞較少,涂層與基體交界處結(jié)合良好,在界面處發(fā)生了元素?cái)U(kuò)散,產(chǎn)生了冶金結(jié)合,涂層的硬度由于涂層粉末混合不均勻在748HV到862HV之間波動。
[Abstract]:At present, the problem of equipment scrapping caused by wear and tear failure is quite serious. According to statistics, about 70% of the equipment damaged has caused the problem of wear failure. It can be seen from this that we should attach importance to the full use of resources, save materials, and strengthen the research on anti-wear technology. It is very important to improve the wear resistance of materials and reduce the wear. In this paper, we aim to explore a simple, efficient, low cost and superior coating quality preparation technology for hard coatings. The specific method is to use binder and alloy powder to form slurry to make precoating on the surface of workpiece, and then electric contact strengthening to obtain high performance coating. First, silicate binder is used respectively. Low melting point metal binder solder paste thermosetting epoxy resin binder and alloy powder were mixed to prepare precoating and then electrical contact strengthening. The results showed that the best effect was obtained by mixing thermosetting epoxy resin binder with alloy powder. Then the precoating prepared by thermosetting epoxy resin binder was improved, and the conductivity of the precoating was enhanced by coating the alloy powder on the surface of the workpiece by scraping the slurry. The optimum ratio of binder and alloy powder was determined to be 1: 2 by experiment. The method of drying precoating after preparation was solved the problem of incomplete curing of precoating. Then the process of electric contact strengthening was improved. It includes setting of pretightening force, preheating treatment, setting of electric contact strengthening current, setting of spindle speed and feed speed, and electric contact strengthening of various alloy powder precoating, the result shows that electric contact strengthening Ni60-WC precoating is the best. The microstructure of the strengthened coating was observed. The results showed that the interface between the coating and the substrate was linear scanning and the microhardness was measured. Through analysis, the microstructure of the coating was dense, the clamping and porosity were less, and the interface between the coating and the substrate was good. Element diffusion occurs at the interface and metallurgical bonding occurs. The hardness of the coating varies from 748 HV to 862 HV due to the uneven mixing of the coating powder.
【學(xué)位授予單位】:東華大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TG174.4
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