注塑机螺杆表面耐磨蚀涂层的制备及性能评价

发布时间：2018-01-05 01:01

本文关键词：注塑机螺杆表面耐磨蚀涂层的制备及性能评价　出处：《太原理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文在38CrMoAl钢基体表面利用激光熔覆技术制备了Ni35、Fe基、Co基和Ni60A合金熔覆层,利用磁控溅射技术制备了Ti-N镀层与类石墨镀层,利用离子氮化方法制备了渗氮层;研究了稀土CeO_2对Ni60A激光熔覆层组织与性能的影响;对各类涂层进行耐磨性能与耐蚀性能表征与评价。结果表明:(1)制备的Ni60A、Fe基、Co基和Ni35熔覆层厚度均为1mm左右,微观组织均为细小的枝晶,其中以Ni60A熔覆层的枝晶最为细小。Ni60A熔覆层的表层硬度(771HV0.1)最高,耐磨性能最好,磨损率为4.124×10~(-14)m~3/N.m;Fe基熔覆层、Co基熔覆层、Ni35熔覆层的耐磨性能依次降低。Ni60A熔覆层与Co基熔覆层的耐腐蚀性能最好,耐蚀性保护评级均为8。(2)稀土CeO_2能够细化和净化Ni60A熔覆层组织,并促使短棒状碳化物M_(23)C_6(M=Fe,Ni,Cr)的生成;随着稀土CeO_2含量的增加,熔覆层显微硬度、耐磨性能与耐蚀性能均呈现先升后降的趋势,至1%时,显微硬度与耐磨性能达到最高值,硬度与磨损率分别为731.87HV0.1、3.057×10~(-14)m~3/N.m,与未添加稀土熔覆层相比,分别提高了31.34%和335%;添加量为0.5%和1%时,具有最好的耐腐蚀性能,耐蚀性保护评级均为5。(3)类石墨镀层的耐磨性能最佳,磨损率为2.91×10~(-16)m~3/N.m,与其他涂层相比降低了2个数量级,Ti-N镀层、Ni60A+1%CeO_2熔覆层与渗氮层耐磨性能依次降低;不同涂层的耐腐蚀性保护评级Rp分别为:渗氮层(Rp=2)、Ni60A+1%CeO_2熔覆层(Rp=8)、Ti-N镀层(Rp=2)和类石墨镀层(Rp=3)。(4)以磨损为主的注塑机螺杆选用类石墨镀层,以腐蚀为主的注塑机螺杆选用激光熔覆Ni60A+1%CeO_2熔覆层。
[Abstract]:The synthesis of Ni35 in 38CrMoAl, using steel surface by laser cladding technology for Fe based, Co based and Ni60A alloy cladding layer, Ti-N coating and graphite coatings were prepared by magnetron sputtering technique, using ion nitriding method to prepare the nitrided layer; the effects of rare earth CeO_2 on Microstructure of laser cladding Ni60A with the performance of wear resistance and corrosion resistance; performance characterization and evaluation of various types of coatings. The results showed that: (1) the preparation of Ni60A, Fe based, Co based and Ni35 cladding layer thickness is about 1mm, the microstructure is fine dendrite with Ni60A cladding layer the dendrite the tiny.Ni60A cladding layer surface hardness (771HV0.1) the highest, the best wear resistance, the wear rate is 4.124 * 10~ (-14) m~3/N.m; Fe based cladding layer, Co based cladding layer, the wear resistance of Ni35 coating decreased.Ni60A Co based cladding layer and the corrosion resistance of the cladding layer can the best corrosion resistance protection rating Were 8. (2) of rare earth CeO_2 can refine and purify the microstructure of cladding layer is Ni60A, and the short rod-shaped carbide M_ (23) C_6 (M=Fe, Ni, Cr) generation; with the increase of the content of rare earth CeO_2, the microhardness of coating, wear resistance and corrosion resistance were first increased and then decreased trend the potential, to 1%, the hardness and wear performance reached the highest value, hardness and wear rate were 731.87HV0.1,3.057 * 10~ (-14) m~3/N.m, compared with the addition of rare earth cladding layer, were increased by 31.34% and 335%; the addition of 0.5% and 1%, with the best corrosion resistance, corrosion protection rating were 5. (3) class of graphite coating the best wear resistance, the wear rate is 2.91 * 10~ (-16) m~3/N.m, compared with other coatings decreased by 2 orders of magnitude, Ti-N coating, Ni60A+1%CeO_2 coating and nitriding layer wear resistance decreased; different coating corrosion protection rating of Rp were: nitriding layer (Rp= 2), Ni60A+1%CeO_2 cladding layer (Rp=8), Ti-N coating (Rp=2) and graphite like coating (Rp=3). (4) graphite like coating was chosen as the main injection molding machine screw, and the laser cladding Ni60A+1%CeO_2 cladding layer was selected as the main injection screw for corrosion.

【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ320.52;TG174.4

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