【正文】 ost widely used in the thermal spraying process. This study is applied to repair the roller surface wear and other defects by plasma spraying process. This subject make the most important parameters and the optimal parameters, through the control of different process parameters and orthogonal analysis by plasma spraying process. And also microstructure and fracture of the plasma sprayed coating were investigated by means of EDS and XRD. NiCrCr3C2 is used as the spray powder in this with high wearresisting, Corrosion, high temperature oxidation resistance, sprayed to the substrate surface will greatly improve the performance of the substrate surface. It is of great significance for improving the life of the roller .Key words roller。 等離子噴涂。 本實(shí)驗(yàn)采用 NiCrCr3C2 作為噴涂粉末，NiCrCr 3C2 具有很高的耐磨、耐蝕、耐高溫和抗氧化性，將其噴涂到基體材料表面將會(huì)大大提高基體表面的性能，對(duì)于提高軋輥的使用壽命具有重要意義。本課題利用等離子噴涂工藝，通過對(duì)不同工藝參數(shù)的控制，利用正交分析法，確定最主要的影響參數(shù)及最優(yōu)參數(shù)。軋輥的修復(fù)方式主要有堆焊、表面激光強(qiáng)化、熱噴涂等工藝。 江蘇科技大學(xué)本 科 畢 業(yè) 設(shè) 計(jì)（論文）學(xué) 院 冶金與材料工程學(xué)院 專 業(yè) 材料成型及控制工程 學(xué)生姓名 張 亞 飛 班級(jí)學(xué)號(hào) 0745561239 指導(dǎo)教師 二零一一年六月 江蘇科技大學(xué)畢業(yè)論文鑄鋼輥軋表面等離子噴涂 NiCrCr3C2 涂層的研究Investigation of Plasma Sprayed NiCrCr3C2 Coating on the surface of the cast steel roller摘要 軋輥是冶金業(yè)的重要部件，是實(shí)現(xiàn)金屬軋制的直接工具，它的質(zhì)量直接關(guān)系到冶金企業(yè)的生產(chǎn)成本、質(zhì)量和效率。軋輥的失效方式主要有輥身斷裂，輥頸斷裂、輥面麻點(diǎn)、剝落及磨損等，其中輥面磨損是最主要的失效方式。離子噴涂技術(shù)是熱噴涂中應(yīng)用最為廣泛一種，本文主要研究等離子噴涂工藝應(yīng)用于修復(fù)軋輥表面磨損等缺陷。利用 EDS 和 XRD 分析測(cè)試手段，研究了斷口形貌和涂層的組織結(jié)構(gòu)。關(guān)鍵詞 軋輥。 NiCrCr3C2 涂層。 plasma spray。 orthogonal analysis目錄第一章 緒論 .......................................................................................................................1 前言 ...................................................................................................................................1 軋輥 ...................................................................................................................................1 軋輥的應(yīng)用及分類 ....................................................................................................1 軋輥的失效方式 ........................................................................................................2 軋輥的修復(fù)技術(shù) ........................................................................................................3 熱噴涂技術(shù) .......................................................................................................................4 等離子噴涂 .......................................................................................................................5 等離子噴涂的基本原理 ............................................................................................5 等離子噴涂的主要特點(diǎn) ............................................................................................6 等離子噴涂的工藝參數(shù) ............................................................................................6 涂層的結(jié)合機(jī)理 ........................................................................................................7 等離子涂層的功能 ....................................................................................................8 等離子噴涂工藝在國(guó)內(nèi)外的研究現(xiàn)狀及發(fā)展趨勢(shì) .......................................................9 研究?jī)?nèi)容 .........................................................................................................................10第二章 實(shí)驗(yàn)設(shè)備及試驗(yàn)方法 ..................................................................................11 實(shí)驗(yàn)材料 .........................................................................................................................11 實(shí)驗(yàn)設(shè)備 .........................................................................................................................11 試驗(yàn)原理及方法 .............................................................................................................12 實(shí)驗(yàn)原理 ..................................................................................................................12 試驗(yàn)方法 ..................................................................................................................12第三章 實(shí)驗(yàn)結(jié)果與正交分析分析 ........................................................................15 前言 .................................................................................................................................15 原始試樣分析 .................................................................................................................15 原始試樣成分 ..........................................................................................................15 試驗(yàn)結(jié)果及正交分析 .....................................................................................................15 正交試驗(yàn)結(jié)果分析 ..................................................................................................18 影響因素主次分析 ..................................................................................................19第四章 顯微組織與力學(xué)性能分析 ........................................................................20 前言 .................................................................................................................................20 顯微組織分析 .................................................................................................................20 力學(xué)性能分析