ISSN:0267-0844    

DOI:10.1179/sur.1994.10.1.1

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1994.10.1.2

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1994.10.1.5

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

AbstractDr WAYNE E. REITZ of Babcock and Wilcox, Lynchburg, VA reviews the latest in this series of conferences, which was attended by nearly 120 professionals from approximately 15 countries and which was held in Sanjo-Tsumbe, Japan on 1–6 November 1993.

ISSN:0267-0844    

DOI:10.1179/sur.1994.10.1.31

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1994.10.1.32

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

AbstractA programme to assess the suitability of thermally sprayed aluminiumalumina composite coatings for antiskid applications on military landing mats has shown potential benefits in performance and cost over the currently specified epoxy coating system. Further advantages are the elimination of volatile organic compound (VDC) emission during coating and the fact that the sprayed coatings do not suffer from ultraviolet degradation.

ISSN:0267-0844    

DOI:10.1179/sur.1994.10.1.36

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

AbstractCadmium has been under considerable pressure in recent years on the grounds of its toxicity and consequent environmental unacceptability. The applications of cadmium, especially as an electrodeposited coating, are reviewed and the possibility of alternatives to cyanide as a process anion and cadmium as a deposit considered. It is emphasised that, with the choice of good effluent treatment methods, total withdrawal of cadmium should not be a rational option.

ISSN:0267-0844    

DOI:10.1179/sur.1994.10.1.41

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

AbstractSealants are frequently applied to close the porosity in thermally sprayed coatings in order to improve corrosion resistance and a physical model has been developed to describe the penetration of sealant into the capillary pore system. It is concluded that a liquid intended for use as a sealant should have low viscosity, high surface tension, and a high wetting capability. However, measurements of coating adhesion have shown that gas trapped at high pressure within the pores can lead to a reduction in substrate–coating bond strength. Polarisation curves were measured for sealed and unsealed atmospheric plasma sprayed (APS) and high velocity oxyfuel (HVOF) WC–Co–Cr coatings in acid and alkaline solutions. Sealing was found to reduce the corrosion current density, but the effect depended strongly on the coating phase composition and microstructure. The WC–Co–Cr HVOF coatings showed better resistance because the higher chromium concentration in the matrix phase permitted a passive oxide layer to form, whereas when spraying Al2O3–TiO2ceramic coatings AP S was found to give higher corrosion resistance as a result of a higher proportion of amorphous phase.

ISSN:0267-0844    

DOI:10.1179/sur.1994.10.1.46

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

AbstractThis report describes the investigations carried out to determine the performance of a range of diamond impreganted core drills on flint aggregate reinforced concrete. Five core drills of various sizes (10, 16, 25, 32, and 40 mm) containing 6·7 wt-% diamond grit were produced for the initial evaluation. Each drill was subjected to a series of drilling tests to ascertain tool life and free cutting characteristics. The results showed a significant correlation between cutting action and drill diameter. At the lower end of the size range (10–25 mm), acceptable penetration rates were achieved at the expense of tool life. As the drill size was increased, tool life improved. The 32 mm diameter sample displayed the best combination of drilling rate and tool life. Premature failure of the 40 mm bit occurred due to the development of wear flats on the tool surface. Analysis of the initial test results revealed that the tentatively selected diamond content of 6·7 wt-% was not the optimum proportion for all sizes. Further studies involving samples containing different concentrations were therefore undertaken. It was found that the effectiveness of the drills could be markedly improved by varying the diamond content according to tool dimension.

ISSN:0267-0844    

DOI:10.1179/sur.1994.10.1.52

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

AbstractElectrodischarge machining (ED M) reduces the thermal fatigue resistance compared to conventional machining. The most common corrective treatments employed are electropolishing, shot peening, and the melonite nitrocarburising process, all of which can improve the thermal fatigue resistance. This improvement is attributed to a smoother surface and the elimination of the overtempered layer as well as the removal of the brittle recast layer. The corrosion resistant oxide layer on the melonite treated specimens also has beneficial effects on the thermal fatigue behaviour. The Charpy V notch impact energy of ED electropolished and shot peened samples is slightly higher than that of conventionally machined specimens. However, melonite treatment lowers the impact energy of the specimens compared to conventionally machined samples.

ISSN:0267-0844    

DOI:10.1179/sur.1994.10.1.56

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor