scholarly journals Microstructure and tribological behavior of W-Mo alloy coating on powder metallurgy gears based on double glow plasma surface alloying technology

2019 ◽  
Vol 55 (2) ◽  
pp. 227-234 ◽  
Author(s):  
D.-B. Wei ◽  
H.-X. Liang ◽  
S.-Q. Li ◽  
F.-K. Li ◽  
F. Ding ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Powder Metallurgy ◽  
Tribological Behavior ◽  
Alloy Coating ◽  
Nanoindentation Test ◽  
Surface Alloying ◽  
Plasma Surface ◽  
Before And After ◽  
Glow Plasma ◽  
Plasma Surface Alloying

In the present paper, plasma surface alloying was implemented on powder metallurgy gears to improve its wear resistance based on double glow plasma surface metallurgy technology. A W-Mo alloy coating was obtained in the process. The morphology, microstructure and phase composition were investigated by SEM, EDS and XRD. The hardness was examined by Vickers hardness test and nanoindentation test. The tribological behavior of powder metallurgy gears before and after plasma surface alloying was evaluated on a ball-on-disc reciprocating sliding tribometer under dry sliding condition at room temperature. The results indicate that the W-Mo alloy coating is homogeneous without defects, which includes deposition layer and interdiffusion layer. The average microhardness of powder metallurgy gears before and after plasma surface alloying is 145.8 HV0.1 and 344.4 HV0.1, respectively; Nano hardness of deposition layer and interdiffusion layer is 5.76 GPa, 14.35 GPa, respectively. The specific wear rate of W-Mo alloy coating is lower than original PM gears. The wear mechanism of W-Mo alloy coating is slight adhesive wear. The W-Mo alloy coating prepared by double glow plasma surface alloying technology can effectively improve wear resistance of powder metallurgy gears.

scholarly journals A New Plasma Surface Alloying to Improve the Wear Resistance of the Metallic Card Clothing

2019 ◽  
Vol 9 (9) ◽  
pp. 1849 ◽  
Author(s):  
Dongbo Wei ◽  
Fengkun Li ◽  
Shuqin Li ◽  
Xiaohu Chen ◽  
Feng Ding ◽  
...  
Keyword(s):  
Wear Resistance ◽  
High Hardness ◽  
Surface Alloying ◽  
Plasma Surface ◽  
Wear Rates ◽  
Before And After ◽  
Glow Plasma ◽  
Surface Morphologies ◽  
And Diffusion ◽  
Plasma Surface Alloying

A new surface strengthening process: Plasma surface chromizing was implemented on the metallic card clothing to improve its wear resistance based on double glow plasma surface metallurgy technology. A chromizing coating was prepared in the process, which consisted of a deposited layer and diffusion layer. The surface morphologies, microstructure, phase composition, and hardness were analyzed in detail. The friction behaviors of the metallic card clothing before and after plasma surface alloying were comparatively analyzed under various sliding speeds at room temperature. The results showed that: 1. The chromizing coating on the surface of metallic card clothing was dense and homogeneous without defects, and the metallic card clothing still maintained its integrity and sharpness. 2. The chromizing coating consist of [Fe,Cr], Cr, Cr23C6, and Cr7C3, which contribute to the high hardness. 3. The average microhardness of metallic card clothing increased from 365.4 HV0.05 to 564.9 HV0.05 after plasma surface chromizing. Nano hardness of the chromizing coating was approximately 1.87 times than the metallic card clothing. 4. At various sliding velocities of 2 m/min, 4 m/min, and 6 m/min, the specific wear rates of metallic card clothing were 16.38, 9.06 and 6.26 × 10−4·mm3·N−1·m−1, and the specific wear rates of metallic card clothing after plasma surface chromizing were 2.91, 3.30, and 2.95 × 10−4·mm3·N−1·m−1. Furthermore, the wear mechanism of the chromizing coating gradually changed from adhesive wear to abrasive wear as the sliding velocity increased. The results indicate that the wear resistance of metallic card clothing was improved obviously after plasma surface chromizing.

A study on tribological behavior of double-glow plasma surface alloying W-Mo coating on gear steel

2015 ◽  
Vol 278 ◽  
pp. 92-98 ◽  
Author(s):  
Zhong-Kai Qiu ◽  
Ping-Ze Zhang ◽  
Dong-Bo Wei ◽  
Xiang-Fei Wei ◽  
Xiao-Hu Chen
Keyword(s):  
Tribological Behavior ◽  
Surface Alloying ◽  
Plasma Surface ◽  
Gear Steel ◽  
Glow Plasma ◽  
Plasma Surface Alloying

Improvement in Wear and Corrosive Wear Resistance of Ti6Al4V Alloy by Double Glow Plasma Surface Alloying with W-Mo and W-Mo-N

2011 ◽  
Vol 675-677 ◽  
pp. 1253-1257 ◽  
Author(s):  
Chang Bin Tang ◽  
Dao Xin Liu ◽  
Fan Qiao Li ◽  
Bin Tang ◽  
Lin Qin
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Ambient Air ◽  
Corrosive Wear ◽  
Surface Alloying ◽  
Nacl Solution ◽  
Plasma Surface ◽  
Glow Plasma ◽  
Surface Modified ◽  
Plasma Surface Alloying

W-Mo and W-Mo-N surface-modified layers on Ti6Al4V alloy were obtained using a double glow plasma surface alloying technique. The morphology, microstructure, and chemical composition distribution of the modified layers were analyzed by scanning electron microscope, Xray diffraction, and glow discharge optical emission spectrometry. The hardness and toughness of the modified layers were measured using a micro-hardness tester, and dynamic repeating press equipment. The wear resistance in ambient air and the corrosive wear resistance in NaCl solution were evaluated using a ball-on-disk wear tester. The results show that W-Mo and W-Mo-N surface modified layers are composed of the alloying layers which vary in composition and phase form along the depth. A microhardness gradient was observed in the modified-surface layers. The surface hardness of the W-Mo-N and W-Mo modified layers was 25.3 and 14.2 GPa, which is seven-fold and 3.9-fold harder than the Ti6Al4V substrate, respectively. W-Mo and W-Mo-N surface-modified layers significantly improved the wear and corrosion resistance of Ti6Al4V. It seems that the wear resistance of W-Mo and W-Mo-N surface-modified layers in NaCl solution is better than that in ambient air owing to the strong lubricating effect of NaCl solution and the excellent corrosion resistance of the modified layers.

Study on wear resistance of TiN multi-permeation layer using glow plasma surface alloying

2007 ◽  
Vol 201 (9-11) ◽  
pp. 5302-5305 ◽  
Author(s):  
X.Y. Kui ◽  
J.Z. Wang ◽  
Y.P. Liu ◽  
J.Y. Xu ◽  
Y. Gao ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Surface Alloying ◽  
Plasma Surface ◽  
Glow Plasma ◽  
Plasma Surface Alloying

Microstructure and corrosion resistance of pure titanium surface modified by double-glow plasma surface alloying

2013 ◽  
Vol 49 ◽  
pp. 1042-1047 ◽  
Author(s):  
Qiong Wang ◽  
Ping-Ze Zhang ◽  
Dong-Bo Wei ◽  
Ruo-Nan Wang ◽  
Xiao-Hu Chen ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Titanium Surface ◽  
Pure Titanium ◽  
Surface Alloying ◽  
Plasma Surface ◽  
Glow Plasma ◽  
Surface Modified ◽  
Plasma Surface Alloying

SURFACE Nb-ALLOYING ON 0.4C–13Cr STAINLESS STEEL: MICROSTRUCTURE AND TRIBOLOGICAL BEHAVIOR

2016 ◽  
Vol 23 (04) ◽  
pp. 1650017 ◽  
Author(s):  
SHENGWANG YU ◽  
KAI YOU ◽  
XIAOZHEN LIU ◽  
YIHUI ZHANG ◽  
ZHENXIA WANG ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Friction And Wear ◽  
Tribological Behavior ◽  
Alloyed Steel ◽  
Formation Mechanisms ◽  
Surface Alloying ◽  
Steel Microstructure ◽  
Glow Plasma ◽  
Nb Alloying ◽  
Plasma Surface Alloying

0.4C–13Cr stainless steel was alloyed with niobium using double glow plasma surface alloying and tribological properties of Nb-alloyed steel such as hardness, friction and wear were measured. Effects of the alloying temperature on microstructure and the tribological behavior of the alloyed steel were investigated compared with untreated steel. Formation mechanisms of Nb-alloyed layers and increased wear resistance were also studied. The result shows that after surface Nb-alloying treatment, the 0.4C–13Cr steel exhibits a diffusion adhesion at the alloyed layer/substrate interface and improved tribological property. The friction coefficient of Nb-alloyed steel is decreased by about 0.3–0.45 and the wear rate after Nb-alloying is only 2–5% of untreated steel.

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