Microstructure and Ablation Behavior of Very Low-Pressure Plasma Sprayed ZrB2-Based Coatings

2021 ◽  
Author(s):  
Di Wang ◽  
Xiao-Tao Luo ◽  
Chang-Jiu Li
Keyword(s):  
Plasma Spraying ◽  
Ablation Rate ◽  
Low Pressure ◽  
Chamber Pressure ◽  
Spray Chamber ◽  
Deposition Pressure ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Plasma Sprayed ◽  
Low Pressure Plasma Spraying

Abstract The effect of deposition pressure on the microstructure and ablation behavior of ZrB2 coatings deposited by very low pressure plasma spraying is investigated. The results show that under a chamber pressure less than 50 kPa, as the spray chamber pressure decreases, the porosity of the coating deposited at the same distance decreases, and the coating prepared under 100 Pa presents the lowest porosity of 1.79 %. Furthermore, among the ZrB2 coatings deposited at 100 Pa, 5 kPa, 10 kPa and 50 kPa, the dense coating deposited at 100 Pa showed the lowest ablation rate of 0.33 μm/s, 0.75±0.08 mg/s.

Effect on Reverse Transferred Arc Treating on Bonding Strength in Low Pressure Plasma Spraying

1996 ◽  
Author(s):  
K. Honda ◽  
I. Chida ◽  
T. Fuse ◽  
T. Murakami ◽  
K.F. Kobayashi
Keyword(s):  
Plasma Spraying ◽  
Bonding Strength ◽  
Low Pressure ◽  
Test Method ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Transferred Arc ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
Low Pressure Plasma Spraying

Abstract Both bonding strength of coating to substrate in low pressure plasma spraying and the effect of reverse transferred arc treating before spraying are studied in this paper. It is difficult to obtain the bonding strength precisely in low pressure plasma spraying by standard testing methods, such as, ASTM Standard C633-79 and JIS H8666-80. Therefore, for the bonding strength test rather than using a conventional adhesive, we believe a vacuum brazing process using Ag-Cu-In-Ti active filler metal at 1023 K should be used. We have also confirmed the practicality of this step. By the above test method, it has been proven that the bonding strength of low pressure plasma sprayed coating is over 100 MPa. Also, that reverse transferred arc treating after blasting enhances the bonding strength of low pressure plasma sprayed coating. It is also believed that the projections formed on the substrate surface by reverse transferred arc treating are buried into the coating and perform the pile effect.

Durability of Low Pressure Plasma Sprayed MoB/CoCr Coating on 310S Stainless Steel in Molten Al-12.07wt.%Si Alloy

2011 ◽  
Vol 314-316 ◽  
pp. 187-190
Author(s):  
Xiao Chen ◽  
Ren Yuan Zhang ◽  
Feng Li
Keyword(s):  
Crystal Structure ◽  
Stainless Steel ◽  
Plasma Spraying ◽  
Low Pressure ◽  
Immersion Test ◽  
Cermet Coating ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Plasma Sprayed ◽  
Low Pressure Plasma Spraying

A sprayed MoB/CoCr cermet coating was formed on 310S stainless steel by low pressure plasma spraying (LPPS), and its durability in the molten Al-12.07wt.%Si has been investigated by SEM、EDS and XRD. The immersion 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, suggesting that the ternary borides have much higher durability.

Optimisation of Concurrent Fibre Winding and Low Pressure Plasma Spraying for the Manufacture of Titanium Matrix Composite Rings

1998 ◽  
Author(s):  
K.H. Baik ◽  
P.S. Grant
Keyword(s):  
Surface Roughness ◽  
Plasma Spraying ◽  
Matrix Composite ◽  
Low Pressure ◽  
Chamber Pressure ◽  
Titanium Matrix ◽  
Titanium Matrix Composite ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Low Pressure Plasma Spraying

Abstract A concurrent fibre winding and low pressure plasma spraying (LPPS) process has been developed to manufacture multiply fibre reinforced titanium matrix composite (TMC) rings in a single spraying operation. Optimisation of the LPPS parameters has been successively performed for two different sizes of Ti-6A1-4V powders by experimental design and statistical analysis, which provided minimimum porosity and surface roughness for both powders. The most important LPPS parameters affecting porosity and surface roughness of deposits were Ar gas flow rate and chamber pressure. During TMC manufacture, the coarse Ti-6A1-4V powder spraying provided enhanced infiltration between fibres but caused degradation of fibre tensile strength, as well as a rough ring surface. The fine Ti-6A1-4V powder gave no significant degradation of fibre strength and a relatively smooth ring surface. 4 ply SiC fibre reinforced TMCs manufactured by the spray-wind process have also been evaluated in terms of porosity, fibre distribution and fibre damage.

scholarly journals Characterization of Defectiveness of Oxygen Transport Membranes Deposited by Low Pressure Plasma Spraying –thin Film Processes

2012 ◽  
Vol 44 ◽  
pp. 1243-1245 ◽  
Author(s):  
F. Azzurri ◽  
G. Capannelli ◽  
A. Comite ◽  
R. Damani ◽  
F. Drago ◽  
...  
Keyword(s):  
Thin Film ◽  
Plasma Spraying ◽  
Oxygen Transport ◽  
Low Pressure ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Low Pressure Plasma Spraying

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

Characteristics of Ceramic Coatings Made by Thin Film Low Pressure Plasma Spraying (LPPS-TF)

2012 ◽  
Vol 21 (3-4) ◽  
pp. 435-440 ◽  
Author(s):  
Andreas Hospach ◽  
Georg Mauer ◽  
Robert Vaßen ◽  
Detlev Stöver
Keyword(s):  
Thin Film ◽  
Plasma Spraying ◽  
Low Pressure ◽  
Ceramic Coatings ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Low Pressure Plasma Spraying
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