大型水压机柱塞的电弧喷涂

1200t水压机的主柱塞总长5520mm,最大直径860mm(在全长中占2510mm)。为修复最大直径上的磨损表面,选用了电弧喷涂工艺。采用沈阳工业大学研制的新型电弧喷涂设备,在磨损表面上喷涂铝青铜过渡层和4Cr13马氏体不绣钢硬化层。喷涂后通过了封孔处理。     

陶瓷棒火焰喷涂方法

陶瓷棒火焰喷涂是50年代初由美国的 Narton公司为适应空间技术的发展而发明的,这项技术在1955年获得美国专利保护,其注册商标为 Rokido。以后在相当长的时间里,一直出 Norton 公司制     

铝青铜堆焊层的抗擦伤性能

使用表面轮廓测量评定擦伤严重程度的方法,对不锈钢、工具钢及堆焊的铝青铜层在与不锈钢板材相摩擦时的擦伤严重程度进行了评定。结果表明堆焊的铝青铜层具有卓越的抗擦伤性能。     

电弧喷涂铝青铜涂层界面及结合机理的研究

本文研究了电弧喷涂铝青铜涂层及界面的组织特征,并探讨了其结合机理。实践表明,这是一种新的低成本的自结合材料与工艺,涂层作为过渡层或工作层都有广阔的应用前景。     

Development of single pendulum impact scratch test for evaluating of thermally sprayed coatings

The adhesion of thermally sprayed coatings is an important subject for engineers applying thermal spray pro-cess.The single pendulum impact scratch test is the most popular method in the tribological inwestigation of modified sur-faces of materials. In this paper,the adhesion of thermally sprayed coatings has been investigated using this testmethod .The key of evaluation for thermally sprayed coatings is the sheer strength of coatings obtained in the test.Theresults show that the test method is reproducible ,reliable and easy to perform,and does not require expensive equip-ment.The procedure proposed in the test method for evaluating the adhesion of coatings is more reliable and realistic thanothers.     

超音速火焰喷涂枪的研究

利用理论分析与实验相结合的方法,在比较和借鉴国外相近喷枪的基础上,对喷枪结构参数进行了选择,对喷枪的实际性能进行了估算。将在此基础上设计出的喷枪进行点火试验,得到的实测值与估算值吻合得很好。这证明了喷枪的结构设计合理,性能的估算比较准确,从而为设计和改进喷枪结构,提高喷枪的性能提供了可靠的理论依据。     

超音速火焰喷涂

30多年来,高质量的WC-Co涂层几乎都是使用爆炸喷涂方法实现的,美国的联合碳化物公司至今独家垄断着这一技术,承揽着世界范围的喷涂加工业务(详见本刊1986年第3期)。80年代以来,一种新的热喷涂方法——超音速火焰喷涂的出现引起了人们的注意,其发明人把这种方法称为Jet Kote。用这种方法喷涂的WC-Co涂层己经达到甚至超过爆炸喷涂层的质量,开始与爆炸喷涂相抗衡。在进行     

Residual stress evaluations of thermally sprayed coatings by a modified Almen method

Based on the Almen method,the authors have modified this test method so that the results of the simple testcan be correlated to the absolute values of residual stress measured fy conventional methods such as X-ray diffraction ormechanical techniques.The technique utilizes changes in the strain of standardized test substrates, which is measured byBHP-700℃ temperature-compensated reststance strain gauges, as an indication of the level of residual stress in thesprayed coatings. Based on the concept that the sprayed coating on the surface of substrate with residual stresses acts aforce (N) and bending momeat (M) on the test piece,the calculating equation of residual stress in the coatings hasbeen proposed. The results of the test method showed that the technique is potentially reliable and accurate, althoughdeficiencies and many controversies are still exist.     

国外等离子切割技术的发展现状及动向

本文综述了国外近些年来等离子切割技术的重大进展和在切割厚度、速度、质量、设备、安全防护以及自动化水平等方面的发展现状,并指出了国外发展动向。     

新型电弧喷涂设备的研制

新型电弧喷涂设备吸收了国外新一代电孤喷涂设备的长处,考虑了我国的实际情况研制而成。喷枪采用了双重雾化喷咀,使用推丝送丝,减低了枪的重量(1.2kg)。送丝具有电磁制动。电源特性专为电弧喷涂而设计。该设备喷涂质量高,喷涂生产率高(喷钢时达15kg/h),耗能低。