本文選題：模具 + 覆層�。� 參考：《中北大學(xué)》2015年碩士論文

【摘要】：模具作為“工業(yè)之母”，其壽命問題長期受到業(yè)界人士的廣泛關(guān)注。提高模具模腔表面的耐腐蝕性，耐磨性熱，，抗酸堿性，和抗氧化性，同是降低模具的熱應(yīng)力是解決模具壽命的關(guān)鍵。本文通過實(shí)驗(yàn)試圖找到強(qiáng)化模腔表面的最優(yōu)材料，來減緩模腔表面的破損。實(shí)驗(yàn)采用的制備技術(shù)為等離子噴焊。 本文首先提出了課題的意義，并總結(jié)了模具的各種失效形式；然后介紹了本文涉及到的噴焊技術(shù)的原理，研究現(xiàn)狀以及發(fā)展。 第二部分主要介紹兩部分，包括實(shí)驗(yàn)材料的選擇和實(shí)驗(yàn)方案的制定。選W6Mo5Cr4V2高速鋼和C45鋼為基體；合金粉末選用Ni60粉和stellite6粉；工作層粉未選用SiC，Cr3C2和WC。將合金粉末Ni60和三種陶瓷粉末分別以7：3、8：2、9：1的比例混合，制成九種粉，噴焊在W6基體上。選用stellite6和stellite6+SiC（stellite6：SiC=7:3）粉末作為C45鋼的噴焊材料。 第三部分介紹了噴焊實(shí)驗(yàn)，采用LU-F500-F600型等離子噴焊機(jī)，試件在噴焊前進(jìn)行打磨除油的過程。噴焊后經(jīng)過線切割，鑲嵌，粗磨，精磨，腐蝕，最終得到待測的金相試件。 第四部分對試驗(yàn)六個方面的對比分析。首先對三種不同的粉末進(jìn)行了宏觀形態(tài)，截面顯微結(jié)構(gòu)，顯微硬度，熱膨脹系數(shù)，比熱容和熱導(dǎo)率的比較，得到的結(jié)論是30%WC，10%Cr3C2和30%WC粉末得到的覆層有利于緩解模具的熱應(yīng)力。接著是對30%SiC，10%Cr3C2，30%WC覆層進(jìn)行對比分析。硬度方面，WC覆層的表面硬度為900HV左右，這與基體的硬度很相近，并沒有達(dá)到強(qiáng)化基體的目的；而SiC和Cr3C2粉末的噴焊層硬度都達(dá)到了1000HV以上，這明顯高于基體的硬度，達(dá)到了強(qiáng)化基體的目的。從熱物性角度分析，30%的SiC制備的覆層最能滿足模具的工作要求。 第五章針對C45鋼等離子噴焊實(shí)驗(yàn)進(jìn)行了分析，主要從宏觀形態(tài)，微觀顯微組織，顯微硬度和熱膨脹系數(shù)方面進(jìn)行了比較。結(jié)果顯示單一的stellite6粉末無法達(dá)到強(qiáng)化材料表面的目的，加入SiC可以有效的提高材料表面性能。 綜上所述：Ni60+SiC比例為7：3的粉末在W6鋼表面噴焊的效果是最好的。在C45鋼stellite6+30%SiC可以顯著增強(qiáng)覆層表面的性能。
[Abstract]:Mould as the "mother of industry", its life-span has long been widely concerned by the industry. To improve the corrosion resistance, wear resistance, acid and alkali resistance and oxidation resistance of mold cavity surface is the key to solve the die life. In this paper, we try to find the best material for strengthening the cavity surface through experiments to reduce the damage of the cavity surface. Plasma spray welding is used in the experiment. This paper first puts forward the significance of the subject, and summarizes the various failure forms of the die, and then introduces the principle, research status and development of the spray welding technology involved in this paper. The second part mainly introduces two parts, including the selection of experimental materials and the formulation of experimental scheme. W6Mo5Cr4V2 high speed steel and C45 steel were chosen as matrix, Ni60 powder and stellite6 powder were used as alloy powder, and no sic Cr 3C 2 and WC C were used as working layer powder. The alloy powder Ni60 and three kinds of ceramic powder were mixed in the ratio of 7: 3: 8: 2: 9: 1 to make nine kinds of powder, which were sprayed on the W6 substrate. Stellite6 and stellite6 SICP stellite 6: sic 7: 3) powders were used as spray welding materials for C45 steel. In the third part, the experiment of spray welding is introduced. The process of polishing and removing oil before spray welding is carried out by using LU-F500-F600 plasma spray welding machine. After spray welding, wire cutting, inlay, rough grinding, grinding, corrosion, and finally get the metallographic specimen to be tested. The fourth part is the comparative analysis of six aspects of the experiment. Firstly, the macroscopic morphology, cross section microstructure, microhardness, thermal expansion coefficient, specific heat capacity and thermal conductivity of three kinds of powders were compared. The conclusion is that the coating of 30WC10Cr3C2 and 30%WC powder is beneficial to alleviate the thermal stress of the mould. Then a comparative analysis is made on the coating of 30 sic and 10 Cr 3 C 2 + 30 WC. The surface hardness of WC coating is about 900HV, which is close to the hardness of matrix, and the hardness of SiC and Cr3C2 powder is higher than that of 1000HV, which is higher than that of substrate, and the hardness of spraying layer of SiC and Cr3C2 powder is higher than that of substrate, which is similar to the hardness of matrix, and the hardness of spraying layer of SiC and Cr3C2 powder is higher than that of substrate. The purpose of strengthening the matrix is achieved. From the point of view of thermal physical properties, the coating prepared by 30% SiC is the best to meet the working requirements of the mould. In the fifth chapter, the plasma spray welding experiments of C45 steel are analyzed, mainly from the aspects of macroscopic morphology, microstructure, microhardness and coefficient of thermal expansion. The results show that the single stellite6 powder can not strengthen the surface of the material, and the addition of SiC can effectively improve the surface properties of the material. In conclusion, the effect of spray welding on the surface of W6 steel is the best when the ratio of: Ni60 SiC is 7:3. The surface properties of the coating can be significantly enhanced by stellite6 30%SiC in C 45 steel.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG174.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉雪梅,張彥華;高能束粉末堆焊技術(shù)[J];表面技術(shù);2005年04期

2 陳克選;白雪梅;李建國;李春旭;陳晶;;等離子噴焊在三偏心蝶閥上的應(yīng)用[J];表面技術(shù);2008年06期

3 龍軍峰;孫智富;葉靖;邢飛;黃永順;陶寧;;等離子噴焊鎳基合金碳化鎢復(fù)合涂層[J];重慶工學(xué)院學(xué)報(bào)(自然科學(xué)版);2009年10期

4 張罡,武穎娜,梁勇,馮鐘潮,張炳春,李家麟,劉方軍;激光-等離子束復(fù)合制備熱障涂層高溫性能試驗(yàn)研究[J];材料工程;2003年02期

5 侯艷麗;石磊;紀(jì)存興;葉一鳴;張哲;;增進(jìn)模具可靠性的表面強(qiáng)化技術(shù)[J];電鍍與涂飾;2009年03期

6 張改梅,王偉,張海鷗,王桂蘭;面向RMP的等離子堆焊過程自動控制技術(shù)研究[J];電焊機(jī);2003年06期

7 劉乃亮;齊暑華;理莎莎;吳波;;難粘塑料表面低溫等離子體處理研究進(jìn)展[J];中國膠粘劑;2009年12期

8 翟林萍;丁益民;姚亮;黃義紅;徐文質(zhì);;利用DISLab溫度傳感器測金屬比熱容[J];大學(xué)物理實(shí)驗(yàn);2012年04期

9 高能物理研究室;張通和;;離子注入技術(shù)在材料科學(xué)中的應(yīng)用[J];儀表材料;1980年05期

10 斯松華,何宜柱;等離子堆焊合金層組織及腐蝕磨損性能[J];焊接學(xué)報(bào);2002年02期

相關(guān)博士學(xué)位論文 前1條

1 潘成剛;多金屬熱鍛模熱應(yīng)力緩解機(jī)理及方法研究[D];武漢理工大學(xué);2010年

本文編號：1789127