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| Abstract No.: |
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Scheduled at:
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Tuesday, September 27, 2011, Saal B2.1 12:15 PM
HVOF & Flame Spraying 1
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| Title: |
Study on the stainless steel 316L coatings sprayed by high pressure HVOF
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| Authors: |
Bo Sun* / Plasma Giken Kogyo Co., Ltd., Japan
Hirotaka Fukanuma/ Plasma Giken Kogyo Co., Ltd., Japan
Naoyuki Ohno/ Plasma Giken Kogyo Co., Ltd., Japan
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| Abstract: |
The conventional high-velocity oxy-fuel (HVOF) process has characteristics of high flame velocity and moderate temperature, it is widely used to deposit cements, metals and alloys coatings such as WC-Co, nickel and stainless steel. In this paper, a high pressure HVOF system with combustion chamber pressure up to 3.0MPa, and with characteristics of higher flame velocity and lower temperature was developed.
In-flight particle velocity was measured under conditions at combustion chamber pressure of 1.0 to 3.0 MPa and stainless steel 316L powder was deposited. The coating microstructure, deposition efficiency and micro-hardness were investigated. It was shown that the combustion chamber pressure has significant influence on particle velocity. Dense coatings composed of the mixture including un-molten or partially molten particles can be deposited by varying the spray parameters. At the experiment, deposition efficiency up to 90% was achieved at the optimized conditions.
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