共查询到19条相似文献,搜索用时 140 毫秒
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硬质合金复合涂层的结合强度与失效机理 总被引:2,自引:0,他引:2
通过4种硬质合金基体和3种TiN/TiCN/Al<,2>O<,3>TiN复合涂层的组合,采用化学气相沉积(CVD)法制备12种涂层顾质合金样品,借助划痕试验机、扫描电镜和能谱仪测定涂层与基体的结合强度,观察划痕的形貌,测定划痕的微区成分.结果表明,基体成分和WC的晶粒度,以及涂层的成分和厚度对涂层与基体的结合强度有明显... 相似文献
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根据热喷涂涂层抗拉结合强度试验的实际情况,研究分析了样块预处理、粘接、粘接剂用量、涂层厚度以及试验机的加载速度等对热喷涂涂层抗拉结合强度测定结果的影响。 相似文献
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以涂层结合强度为判据,采用Ni-Al丝材和PARXAIR-9935电弧喷涂系统制备镍基涂层,通过正交试验对电弧喷涂NiAl合金工艺进行了优化。利用在线检测系统对焰流的强度、粒子的速度和温度进行检测,通过金相显微镜、扫描电镜、能谱仪等手段对涂层和断口形貌进行分析。结果表明,喷涂电流、喷涂电压、雾化空气压力、喷涂距离对NiAl合金涂层结合强度具有不同程度的影响,确定优化后的工艺参数为喷涂电流150A,喷涂电压27V,雾化空气压力0.6MPa,喷涂距离150mm。在优化工艺参数条件下,电弧喷涂NiAl合金涂层组织呈现出典型的层状结构;并且随着涂层厚度的增加,结合强度呈线性下降,其最大结合强度可达39.8MPa。 相似文献
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氧乙炔火焰喷涂涂层强度分析 总被引:1,自引:0,他引:1
从乙快流量、涂层厚度、送粉量、喷涂距离、表面粗化等五个方面,阐明了影响氧乙快火焰喷涂涂层强度的原因。并通过对试验数据的分析,确定了涂层达到最佳强度时,各因素的工作范围。 相似文献
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采用化学气相沉积(CVD)工艺在无氧铜表面制备钨涂层,利用热等静压扩散连接工艺对铜钨复合界面进行热处理,得到铜钨复合材料。采用SEM、金相显微镜观察涂层及铜钨界面微观形貌,用胶粘和钎焊两种测试方法评价铜钨界面结合强度。结果表明,钨涂层显微组织为柱状晶,涂层厚度及界面均匀;结合强度测试过程中涂层均未剥落或损伤,表明钨铜界面结合强度大于胶粘界面和钎焊界面的结合强度。 相似文献
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采用真空雾化制备了CoCrAlTaY高温合金粉末。结果表明:该合金粉末呈球形,粉末粒度呈近正态分布,粉末由CoAl、γ、Cr27C3和TaC相组成;合金粉末涂层与基体结合良好,其结合力达到52 MPa。 相似文献
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采用电沉积水热合成法和高温煅烧相结合的方法,制备了生物陶瓷涂层,研究了涂层与基体间过渡层的物相组成和界面结合强度。用X射线(XRD)、扫描电镜(SEM)和粘接拉伸法进行分析。研究结果表明:水热合成后,界面结合强度较低,为7.04MPa。在空气中煅烧,700℃以下时,界面出现极薄TiO_2层,同时随着煅烧温度的升高,界面结合强度提高;800℃以上时,由于厚而疏松的TiN过渡层的出现,界面结合强度反而下降。为获取对骨生长有利的HAP+β-Ca_3(PO_4)_2双相结构,且界面结合强度高的涂层材料,将原始试样用NaOH碱液处理,电沉积水热合成后,在氢气中于900℃煅烧,过渡层为薄且致密的TiO_2层,可获得高的界面结合强度,为22.39MPa。 相似文献
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采用显微镜技术和腐蚀速度测量法研究S400、表面预淬火的S500、含钒的S500 3种钢筋暴露在大气中的抗腐蚀行为.同时还研究了在水泥水合作用过程中,水泥与钢筋之间的结合力对钢筋腐蚀的影响.实验结果表明,具有较高抗大气腐蚀能力的钢筋类型是含钒的S500.相反,抗腐蚀能力最小的是表面预先淬火的S500钢筋.从ESEM观测到的形貌和钢筋表面的铁锈层的厚度结果看,钢筋与混凝土之间的结合力随侵蚀时间(从45天~122天)的延长而减小. 相似文献
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无取向硅钢表面绝缘涂层 总被引:2,自引:0,他引:2
无取向硅钢表面绝缘涂层分成有机涂层,无机涂层和半无机涂层三大类。无机涂层的基本成分是磷酸盐涂料和磷铝酸基涂料中添中胶态二氧化硅,氧化镁和硼酸。无机涂层具有良好的耐热和焊接性能,但其中冲制性和粘结性不佳,半无机涂层基本成分为磷酸盐,铬酸盐,乳胶树脂溶液,弥散促进剂和表面活性剂,其中弥漫促进剂和表面活性剂对涂层的质量具有重要作用。半无机涂层具有良好的冲制性和粘结性,但其耐热性和焊接性不及无机涂层。 相似文献
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High Temperature Tribological Studies on Surface Engineered Tool Steel and High Strength Boron Steel
The popularity of hot sheet metal forming processes in the recent years has necessitated research efforts to improve tool life and control the friction level during hot forming operations. In this work, the tribological properties of tool steel and ultra high strength boron steel (UHSS) pairs at elevated temperatures have been studied by using a special hot sheet metal forming test rig that closely simulates the conditions prevalent in the real process. This test involves linear unidirectional sliding of a preheated UHSS sheet between two tool steel specimens where new workpiece material is continuously in contact with the tool surface. The study is aimed at investigating different surface treatments/coatings applied on either the tool or sheet surface or on both. The results have shown that it is possible to control the coefficients of friction through surface treatments and coatings of the tool and workpiece materials. The application of a coating onto the sheet material has a greater influence on the friction compared to changing the tool steel surface. After running‐in, the investigated tool steel variants show almost similar frictional behaviour when sliding against the same sheet material. Although coating the UHSS sheet reduces friction, it abrades the tool surface and also results in transfer of the sheet coating material to the tool surface. 相似文献
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Chao-ping JIANG Ya-zhe XING Feng-ying ZHANG Jian-min HAO Xu-ding SONG 《钢铁研究学报(英文版)》2014,21(10):969-974
Fe-based and Fe/Mo composite amorphous coatings were deposited on the surface of plain carbon steel substrates by atmospheric plasma spraying (APS). With increasing the Mo alloy content, the microstructure of the coatings revealed more dense structure. The porosities of composite coating were all less than those of Fe-based coat- ing due to Mo alloy self-bonding performance. The ML10 friction and wear tester was employed to investigate the wear behaviors of the coatings under dry sliding conditions. It was found that the mass loss of the resultant coatings decreased with increasing Mo-based powders into the feedstock. This was attributed to the reduction of the delamina- tions resulting from improved intersplat bond with Mo addition. 相似文献
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