ISSN:0267-0844    

DOI:10.1179/sur.1985.1.3.161

出版商:Taylor&Francis    

年代:1985

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1985.1.3.163

出版商:Taylor&Francis    

年代:1985

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1985.1.3.165

出版商:Taylor&Francis    

年代:1985

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1985.1.3.169

出版商:Taylor&Francis    

年代:1985

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1985.1.3.175

出版商:Taylor&Francis    

年代:1985

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1985.1.3.176

出版商:Taylor&Francis    

年代:1985

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1985.1.3.179

出版商:Taylor&Francis    

年代:1985

数据来源: Taylor

摘要:

AbstractDetailed studies carried out by the Ford Motor Co. and the Machine Tool Institute of the Rhine-Westphalian Technical University in Aachen have shown that plasma nitriding can replace conventional carbonitriding case hardening treatments in gearing applications. It has been demonstrated that root and flank strengths comparable with those produced on case hardening gears can be obtained. The use of the process has enabled both operating and manufacturing costs to be substantially reduced. As a result of this investigation, Ford has installed a plasma nitriding unit in its tractor plant in Antwerp, Belgium. This unit is fully integrated into the production lines and is capable of treating a range of gear components.

ISSN:0267-0844    

DOI:10.1179/sur.1985.1.3.187

出版商:Taylor&Francis    

年代:1985

数据来源: Taylor

摘要:

AbstractA new technique has been developed for the accurate determination of carbonaceous compounds on metal sUlfaces. The technique is based on oxidation of the samples in a furnace in flowing high purity oxygen as the furnace temperature is continuously raised. The carbon and hydrocarbons present on the metal surface oxidize selectively in specific temperature ranges. The reaction products are transformed in a separate oxidation furnace to CO2and H2O. The concentrations of these compounds are continuously analysed using a high sensitivity infrared detector. The method gives an accurate quantitative value of the total surface carbon content and also semiquantitative information on the carbonaceous compounds present. The measurement technique is presented together with some experimental results from the surface analysis of carbonaceous impurities on low carbon steel sheets, copper tubes, and cemented carbide cutting tools.

ISSN:0267-0844    

DOI:10.1179/sur.1985.1.3.193

出版商:Taylor&Francis    

年代:1985

数据来源: Taylor

摘要:

AbstractThe results of investigations into the thermochemical heat treatment of titanium and the titanium alloy Ti-6Al-4V in a glow discharge are reported. The effect of the important process parameters, gas composition and temperature, on the microstructure, microhardness, and mechanism of layer formation has been studied by means of X-ray diffraction and electron microscopy. The microhardness (Knoop) profiles have been measured and related to various heat treatment conditions. It has been found that the microstructure and the microhardness profiles depend strongly on gas composition. The presence of hydrogen in the gas mixture led to hydride formation in pure titanium, while the microstructure of the titanium alloy Ti-6Al-4V was not affected by hydrogen. It was shown that plasma heat treatment in a gas mixture containing carbon resulted in the formation of titanium carbide. At high carbon contents, compound layer formation can be retarded by a deposit of soot on the surface. It has been observed that, in addition to the established methods of nitrogen mass transfer, i.e. implantation of reactive species and reactive sputtering, chemisorption of nitrogen at the surface plays a significant role in layer formation if pure nitrogen gas is used for the plasma heat treatment; however, the addition of carbon to the gas mixture causes variations in the layer formation mechanism.

ISSN:0267-0844    

DOI:10.1179/sur.1985.1.3.198

出版商:Taylor&Francis    

年代:1985

数据来源: Taylor