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探讨了国产4Cr13钢制饲料压粒模的预先热处理和最终热处理工艺对压粒模力学性能的影响,试验表明,4Cr13钢制饲料压粒模经低温碳氮共渗,真空高压气淬后,其强韧性,耐磨性能及使用寿命显著提高,可替代进口产品。 相似文献
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M. Aliofkhazraei S.H.H. Mofidi A. Sabour Rouhaghdam E. Mohsenian 《Journal of Thermal Spray Technology》2008,17(3):323-328
Recently, new duplex surface treatments involving the use of pre-electroplating and pulsed plasma electrolytic nitrocarburizing
(PPEN/C) have led to the possibility of using this material for applications usually typical for tool steels. In this work,
we present results concerning the duplex treatment of pre-electroplating of Cr and PPEN/C of AISI 1020 mild steel. The samples
were electroplated in a plating bath. After electroplating, the samples were nitrocarburized. The effects of time and applied
voltage of PPEN/C process were discussed. The samples were characterized using scanning electron microscopy (SEM), atomic
force microscopy (AFM), and microhardness testing. Electroplated layers of up to 100 μm were obtained. The subsequent PPEN/C
increased the surface hardness to 1200 HV0.2 due to the formation of nitrides and carbides. Decreasing the size of nanocrystalline carbonitrides will lead to improvement
of their wear resistance significantly. 相似文献
105.
CrWMn钢制滚丝模采用碳氮共渗再进行螺纹渗硼的复合渗强化工艺后,滚丝模表面共渗层深度达0.3mm,共渗层表面硬度高于碳氮共渗强化表面硬度,取代了氰化盐浴渗碳工艺,保护了环境。新工艺已应用于工业生产,滚丝模平均使用寿命达到了120万件,取得了较好的经济效益和社会效益。 相似文献
106.
为提高TiAl基合金的耐磨性及抗高温氧化性,利用渗氮在TiAl基合金表面形成氮化物,以提高耐磨性;渗碳形成致密且与基体结合牢固的碳化物层,提高抗高温、抗氧化性;将二者结合,采用辉光离子碳氮共渗的方法,研究了渗层的相结构组成、不同工艺参数对TiAl基合金离子碳氮共渗后渗层厚度以及表面硬度和耐磨性的影响.结果表明:TiAl基合金共渗层是由碳氮化合物层与过渡层组成的复合相结构;随共渗温度的升高和时间的延长,渗层厚度增加;与未经共渗处理的试样相比,表面硬度及耐磨性显著提高.X射线衍射结果显示,渗层主要由TiC,TiN,AlTi3,Al2O3等组成. 相似文献
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A novel technique to form Ti(C, N) on titanium, named as plasma electrolytic carbonitriding (PEC/N) on cathode was successful used to prepare TiCxN1 − x coating. The structure, composition and morphology of the coating were characterized by XRD, XPS and SEM, respectively. The results indicated that TiC0.3N0.7 as a new species appears on the surface of the titanium plate, and the thickness of the coating with porous surface morphology increases with the treated time. The blood compatibility of the TiC0.3N0.7 coating was evaluated by haemolysis ratios, dynamic blood clotting test, plasma recalcification time and platelet adhesion. The results indicated that the blood compatibility of the plasma-treated titanium with TiCxN1 − x coating is significantly improved as compared to the original titanium. Additionally, the results derived from measurements of hardness and corrosion indicated that the coating has excellent mechanical and corrosion-resistant properties. 相似文献