Study on Flame Spraying(Report 3). Sliping Wear Resistant Characteristics of Sprayed Coating.

The paper considers the application of wear resistant coatings by methods of gas thermal and flame spraying. It demonstrates the relationship between adhesion strength of the sprayed coating and surface roughness after abrasive jet machining using piston rings with steel-molybdenum coating as an example. The authors consider the results of studies aimed defining the relationship between surface roughness and of jet-abrasive machining conditions: the distance between the nozzle exit and the workpiece, the number of passages, the operating air pressure and frequency of the shot swapping.

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Ten Year Interim Report of Thermal Sprayed Zn, Al, and Zn-Al Coatings Exposed to Marine Corrosion by Japan Association of Corrosion Control

Thermal Spray 2000: Proceedings from the International Thermal Spray Conference ◽

10.31399/asm.cp.itsc2000p1017 ◽

2000 ◽

Author(s):

S. Kuroda ◽

M. Takemoto

Keyword(s):

Field Test ◽

Coastal Area ◽

Corrosion Test ◽

Flame Spraying ◽

Interim Report ◽

Corrosion Control ◽

Corrosion Performance ◽

Marine Corrosion ◽

Sprayed Coating ◽

Spray Treatment

Abstract Thermal spray committee of Japan Association of Corrosion Control (JACC) has been conducting a corrosion test of thermal sprayed Zn, Al and Zn-Al coatings at coastal area since 1985. Twelve kinds of sprayed coating were deposited onto steel pipe by arc- and flame-spraying at varied thickness and subjected to various post-spray treatment. The samples were set vertically into the seawater at a port 80 km south from Tokyo. Corrosion performance were inspected annually by recording the appearance and coatings' thickness at sea air-, splash- and tidal-zones. No significant changes were observed for five years exposure. After 7 years, however, Zn coatings with and without sealing started to suffer degradation in the immersed portion. Contrary to this, Al and Zn-Al coatings still exhibit superb corrosion performance. The test will be continued till 2001 to finish a 15 years field test. This paper reports the summary of corrosion performance of sprayed coating during the first 10 year period.

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Ceramic and Cermet Coatings for Cylinder Liner in Ultra Light Weight Engines - Novel Processing and Manufacturing of Ceramic Layer Composites

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.45.1330 ◽

2006 ◽

Vol 45 ◽

pp. 1330-1335 ◽

Cited By ~ 1

Author(s):

Rainer Gadow ◽

D. López ◽

A. Candel

Keyword(s):

Cylinder Liner ◽

Cost Effective ◽

Light Metal ◽

Engine Block ◽

Flame Spraying ◽

Light Weight ◽

Operation Conditions ◽

Novel Processing ◽

Sprayed Coating ◽

The Cost

Actual requirements in the automotive industry are the reduction of fuel consumption and pollution emission, engine efficiency improvement, as well as cost reduction. Most of these requirements are fulfilled by reducing the total weight of the vehicle. This results in an increasing utilization of light metal components for engine applications. Significant weight savings are obtained by changing the engine block material from cast iron to aluminum or even to magnesium aluminum hybrid constructions. Despite of all advantages the industrial implementation of light metals is often inhibited by their poor surface properties especially concerning wear and tribological behavior. Due to the highly loaded operation conditions a cylinder liner surface reinforcement is necessary. A very promising technological alternative is the internal cylinder reinforcement by using HVOF (high velocity oxygen fuel) sprayed coatings. By using these advanced high energetic coating technologies, material combinations containing solid lubricant ceramic dispersions can be deposited. The thermal spray processes represent a cost effective and flexible solution for ultra light weight engine technology. This research is focused on the development of HVOF sprayed coating systems for cylinder liners, the coating optimization and the cost effective implementation of this hypersonic spray technology in a series production process. It will be shown that cast engine block bores can be directly coated by using an automated HVOF process, obtaining improved coating results. The internal coating process by hypersonic flame spraying is a superior technological alternative to the APS process for high quality cylinder liner and engine crankcase applications.

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Modeling features of the technological process of forestry machines parts strengthening by the method of gas-thermal spraying

Journal of Physics Conference Series ◽

10.1088/1742-6596/2131/2/022034 ◽

2021 ◽

Vol 2131 (2) ◽

pp. 022034

Author(s):

V Kretinin ◽

A Teppoev ◽

V Sokolova

Keyword(s):

Technological Process ◽

Thermal Spraying ◽

Flame Spraying ◽

Technological Parameters ◽

Wear Resistant ◽

Wear Resistant Coatings ◽

Conducting Research ◽

Gas Flame ◽

Working Bodies ◽

Spraying Process

Abstract The efficiency of the working bodies of tillage forestry machines is determined by the sharpness of their soil-cutting elements. The purpose of the study is to substantiate the modes of the technological process of strengthening and recovery of cutting working forestry machines by the method of gas-flame spraying of wear-resistant coatings to increase their wear resistance and preserve the blade sharpness by implementing the self-sharpening effect, which allows increasing their life by 2-3 times. Technical and economic indicators of the gas-flame spraying process, as well as the scope of its application, depend on how well the technological modes of the spraying process are selected. The relevance of the topic is due to the need to increase the durability of tillage tools by strengthening their surfaces treatment. Such effective methods include the technology of recovery and strengthening of the working bodies of tillage machines using the technology of gas-flame spraying. In this regard, the issues of conducting research have become particularly relevant: to identify the relationships of technological parameters during the gas-flame application of wear-resistant coatings; to change the strength characteristics of the material of parts during their recovery, providing the necessary reliability and durability.

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