The Coatings Formation and Characteristic of a Low Pressure Thermal Plasma Torch

2021 ◽  
Vol 871 ◽  
pp. 107-111
Author(s):  
Cheng Qi Sun ◽  
Lian Tong An
Keyword(s):  
Heat Transfer ◽  
Plasma Spraying ◽  
Plasma Torch ◽  
Thermal Spraying ◽  
Plasma Jet ◽  
Low Pressure ◽  
Feedstock Powder ◽  
Low Pressure Plasma ◽  
Spray Characteristic ◽  
Low Pressure Plasma Spraying

Compared with the atmosphere plasma spraying (APS), low pressure plasma spraying (LPPS) has been widely used due to deposit a specific and unique coating. A new low pressure thermal spraying plasma torch was designed according to the plasma spray characteristic in the low pressure environment. The plasma jet characteristic and the coatings microstructure were analyzed. In this study, Kundsen number has a great effect on the heat transfer of feedstock powder. With the increase of current, the plasma torch efficiency will decrease. A equiaxed microstructure of 316L coatings were deposited.

MoB/CoCr Coating by Low Pressure Plasma Spraying against Erosion by Molten Al-12.07wt.%Si Alloy

2011 ◽  
Vol 284-286 ◽  
pp. 676-679
Author(s):  
Xiao Chen
Keyword(s):  
Crystal Structure ◽  
Plasma Spraying ◽  
Thermal Spraying ◽  
Low Pressure ◽  
Immersion Test ◽  
Pressure Plasma ◽  
High Durability ◽  
Low Pressure Plasma ◽  
Novel Material ◽  
Low Pressure Plasma Spraying

MoB/CoCr, a novel material for thermal spraying, with high durability is used to resist erosion by molten Al-12.07wt.%Si alloy. The durability of the MoB/CoCr coating prepared by low pressure plasma spraying (LPPS) has been investigated using a molten-metal immersion tester. The test revealed that the MoB/CoCr coating has much higher durability without dissolution in the molten Al-12.07wt.%Si alloy. Little change of crystal structure, mainly composed of ternary borides of Co2MoB2 and CoMoB, is observed after the immersion test, suggesting that the ternary borides have much higher durability.

Oxidation Property of CoNiCrAlY Coatings Prepared by Various Thermal Spraying Techniques

2006 ◽  
Vol 522-523 ◽  
pp. 339-344 ◽  
Author(s):  
Mitsuhiro Shibata ◽  
Seiji Kuroda ◽  
Makoto Watanabe ◽  
Yukihiro Sakamoto
Keyword(s):  
Plasma Spraying ◽  
Cross Sections ◽  
Thermal Spraying ◽  
Mass Gain ◽  
Low Pressure ◽  
Operating Conditions ◽  
Pressure Plasma ◽  
Surface Oxides ◽  
Low Pressure Plasma ◽  
Low Pressure Plasma Spraying

To protect various gas turbine components against high temperature in the hot sections of power generation plants and aircraft engines, thermal barrier coatings (TBC’s) have been developed and widely used. Conventional TBC’s consist of a MCrAlY (M: Ni, Co, NiCo, etc,) bond coating for oxidation resistance and a ceramic top coating for thermal insulation. High quality coatings of MCrAlYs have been produced mostly by low pressure plasma spraying but other more economical processes are also used depending on the operating conditions of the component to be coated. In this study, CoNiCrAlY powders were deposited on Inconel 718 substrate with three types spraying system, i.e., low pressure plasma spraying, high velocity oxy-fuel spraying, and atmosphere plasma spraying. Specimens were isothermally tested for up to 100 h in air at 1373 K. Mass gain of the coatings was measured. Microstructure of the coating cross sections and the surface oxides were observed with SEM. To identify the crystal structure of the formed oxides, the specimens were analyzed by XRD from the surface.

Structures and mechanical properties of rapidly solidified deposits of an Fe-1.50wt.%C-10.7wt.%Cr alloy by low pressure plasma spraying

1994 ◽  
Vol 186 (1-2) ◽  
pp. 105-112 ◽  
Author(s):  
Kenji Murakami ◽  
Yoshitaka Fujii ◽  
Hiroshi Matsumoto ◽  
Tsuyoshi Irisawa ◽  
Taira Okamoto ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plasma Spraying ◽  
Low Pressure ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Rapidly Solidified ◽  
Low Pressure Plasma Spraying

scholarly journals Formation of NiCrAlY/NiAl Multi-Layered Coating by Low Pressure Plasma Spraying.

1997 ◽  
Vol 46 (12) ◽  
pp. 1436-1441
Author(s):  
Hidekazu TAKIZAWA ◽  
Keisuke YONEHAMA ◽  
Koh-ichi SUGIMOTO ◽  
Mitsuyuki KOBAYASHI
Keyword(s):  
Plasma Spraying ◽  
Low Pressure ◽  
Layered Coating ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Low Pressure Plasma Spraying
Sign in / Sign up

Export Citation Format

Share Document