Study on Thermal-Shock-Resistance of the Composite Coating of 20 Steel Substrate by Hot Dip Aluminum and Micro-Arc Oxidation

2016 ◽  
Vol 723 ◽  
pp. 450-453
Author(s):  
Xiao Feng Sun ◽  
Yuan Lin Huang ◽  
Wei Song ◽  
Ming Ming Sun
Keyword(s):  
Residual Stress ◽  
Thermal Shock ◽  
Composite Coating ◽  
Thermal Shock Resistance ◽  
Steel Substrate ◽  
Steel Plates ◽  
Micro Hardness ◽  
Combined Process ◽  
Micro Arc Oxidation ◽  
Shock Resistance

By combined process of hot dip aluminum and micro–arc oxidation, a multilayer composite coating was obtained on the surface of 20 steel plates. The micro-hardness, morphology, residual stress and thermal-shocking performance of the coating were investigated by HVS-1000 micro-hardness instrument, SEM, X-350 stress instrument and etc. The results showed that the micro-hardness of the coating appeared hard-soft-hard from surface to inner, the effective thermal-shock times of the coating was 130, its residual stress of the coating was 181.7 MPa after hot shock 80 times.

Effect of Heat Treatment Temperature on Properties of SiO2-ZrO2-Al2O3-Cr2O3 Coatings on Stainless Steel Substrate

2012 ◽  
Vol 538-541 ◽  
pp. 359-362
Author(s):  
Qing Mei Jia ◽  
Yong Hong Tang ◽  
Ke Nan Meng
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Thermal Shock ◽  
Abrasion Resistance ◽  
Thermal Shock Resistance ◽  
Ceramic Coating ◽  
Erosion Resistance ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Shock Resistance

The SiO2-ZrO2-Al2O3-Cr2O3 film is coated on the surface of stainless steel using analytical reagent TEOS, ZrOCl2·8H2O, Al(NO3)3·9H2O and Cr(NO3)3·9H2O as precursor and basing on mole ratio to calculate through Sol-gel method. The phase transformation behavior，erosion resistance，thermal shock resistance and abrasion resistance of ceramic coating by different heat treatment are studied. The results show that: 1)The SiO2-ZrO2-Al2O3-Cr2O3 gel coatings has non-crystalline structure after the treatment at 700°C and 800°C. New substance is not created below 700°C 2) The stainless steel substrate with ceramic coating has a higher erosion resistance at high temperature (700°Cand 800°C)than that without coating.3) Thermal shock resistance of the samples treated in 700°C is the best which has reached within 17-21cycles (900°C, air cooling). 4) The stainless steel substrate with ceramic coating has a higher abrasion resistance than that without coating. The samples treated at 700°Cand 800°C have the best abrasion resistance.

scholarly journals Influence of Bond Coat on Thermal Shock Resistance and Thermal Ablation Resistance for Polymer Matrix Composites

2021 ◽  
Vol 8 ◽  
Author(s):  
Jiahui Zhou ◽  
Jianing Jiang ◽  
Longhui Deng ◽  
Jingqi Huang ◽  
Jieyan Yuan ◽  
...  
Keyword(s):  
Residual Stress ◽  
Thermal Shock ◽  
Bonding Strength ◽  
Thermal Ablation ◽  
Thermal Shock Resistance ◽  
Polymer Matrix Composites ◽  
Coating System ◽  
Matrix Composites ◽  
Ablation Resistance ◽  
Shock Resistance

Polymer matrix composites (PMCs) have been widely used in aero industry because of its low density and high strength-to-weight ratio. However, the application of PMCs is still limited by poor abrasion resistance, weak oxidation resistance and low operation temperature. In this study, Cu (Al)/NiCrAlY/YSZ triple layer coating system was deposited on glass fiber reinforced polyimide matrix composites (FPM) by means of High Velocity Oxygen Fuel (HVOF) for metallic coatings and Atmospheric Plasma Spraying (APS) for YSZ coating. The influences of different bond coats and different thickness of the top coat on the thermal shock resistance and thermal ablation resistance of the coating system was investigated. Compared with Al particle, Cu particle has a high density and correspondingly a high kinetic energy during spraying by HVOF, resulting in a high bonding strength between the Cu coating and FPM substrate. In the thermal shock test, the coating Cu/NiCrAlY/YSZ has a much longer lifetime than the coating Al/NiCrAlY/YSZ. After high-speed impact on the substrate, there is a great compressive stress at the interface, which makes a plastic deformation to the substrate, and the particles are closely embedded into the substrate to form a strong mechanical interlock. The coating system consisting of 50 μm Cu, 50 μm NiCrAlY, and 200 μm 8YSZ exhibited the best thermal shock resistance, thermal ablation resistance and bonding strength. The increase of the top coat thickness will lead to the increase of residual stress and the decrease of bonding strength. The failure mechanism of the coating is mainly attributed to the residual stress in the deposition process and the thermal stress caused by thermal expansion mismatch.

The Effect of Reoxidation on Thermal Shock Resistance of SrTiO3-Based Varistors

2009 ◽  
Vol 421-422 ◽  
pp. 529-532
Author(s):  
Atsushi Hitomi ◽  
Naoki Chida ◽  
Minoru Ogasawara ◽  
Dai Matsuoka
Keyword(s):  
Residual Stress ◽  
Thermal Shock ◽  
Compressive Stress ◽  
Thermal Shock Resistance ◽  
Thermal Cracking ◽  
Lattice Parameter ◽  
Key Factor ◽  
Shock Resistance

The fabrication processes of SrTiO3-based varistors were investigated to obtain highly thermal-shock-resistant devices. It has been found that the reoxidation conditions are strongly related to the thermal cracking ratio (%) of the varistors. A large compressive stress was generated on the varistor surface by reoxidation, consequent upon the lattice parameter difference between its surface portion and its internal portion. This residual stress on the surface is thought to be the key factor of the achieved thermal-shock-resistance.

Temperature and Microstructures Dependent Thermal Shock Resistance Models for Ultra-High-Temperature Ceramics Considering Effect of Residual Stress

2013 ◽  
Vol 29 (4) ◽  
pp. 695-702 ◽  
Author(s):  
R. Z. Wang ◽  
S. G. Ai ◽  
W. G. Li ◽  
J. Zheng ◽  
C. Z. Zhang
Keyword(s):  
Residual Stress ◽  
High Temperature ◽  
Thermal Shock ◽  
Fracture Strength ◽  
Thermal Shock Resistance ◽  
Temperature Dependent ◽  
Ultra High Temperature Ceramics ◽  
Micro Cracks ◽  
Shock Resistance ◽  
Ultra High Temperature

ABSTRACTBased on the researches on the temperature and microstructures dependent fracture strength and temperature dependent thermal shock resistance, the new thermal shock resistance models for ultra-high-temperature ceramics were proposed. The effect of density on the fracture strength of material was investigated. A damage term was introduced to reveal the effects of uncertain factors on fracture strength. The roles of residual stress and microstructure sizes at different initial thermal shock temperatures in the thermal shock resistance were studied using the models. The study showed that the models can reveal the relationships among the residual stress, microstructure sizes and the temperature dependent thermal shock resistance well. The better thermal shock resistance is found for ultra-high-temperature ceramics having small SiC grains and relatively large micro-cracks around SiC grains. Large enhancement in thermal shock resistance can be achieved through our studies.

Effect of Heat Treatment Temperature on Properties of SiO2-ZrO2-Al2O3-Cr2O3 Coatings on Stainless Steel Substrate

2010 ◽  
Vol 177 ◽  
pp. 321-324
Author(s):  
Shu Xian Liu ◽  
Qian Ping Wang ◽  
Yi Miao Nie
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Thermal Shock ◽  
Abrasion Resistance ◽  
Thermal Shock Resistance ◽  
Ceramic Coating ◽  
Erosion Resistance ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Shock Resistance

The SiO2-ZrO2-Al2O3-Cr2O3 film is coated on the surface of stainless steel using analytical reagent TEOS, ZrOCl2•8H2O, Al(NO3)3•9H2O and Cr(NO3)3•9H2O as precursor and basing on mole ratio to calculate through Sol-gel method. The phase transformation behavior, erosion resistance, thermal shock resistance and abrasion resistance of ceramic coating by different heat treatment are studied. The results show that: 1) The SiO2-ZrO2-Al2O3-Cr2O3 gel coatings has non-crystalline structure after the treatment at 700°C and 800°C. New substance is not created below 700°C. 2) The stainless steel substrate with ceramic coating has a higher erosion resistance at high temperature (700°C and 800°C)than that without coating.3) Thermal shock resistance of the samples treated in 700°C is the best which has reached within 17-21cycles (900°C, air cooling). 4) The stainless steel substrate with ceramic coating has a higher abrasion resistance than that without coating. The samples treated at 700°C and 800°C have the best abrasion resistance.

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