The Influence of Particles Size and Composition Variation of NiCr-CrC(20NiCr) Metal Matrix Composites Coatings Properties on Boiler Tubes Application

2017 ◽  
Vol 889 ◽  
pp. 30-35 ◽  
Author(s):  
Erie Martides ◽  
Budi Prawara ◽  
Husaini Ardy ◽  
Endro Junianto ◽  
Budi Priyono
Keyword(s):  
Particle Size ◽  
Thermal Shock ◽  
Metal Matrix ◽  
Thermal Shock Resistance ◽  
Resistance Testing ◽  
Matrix Composites ◽  
Spray Method ◽  
Hvof Thermal Spray ◽  
Boiler Tubes ◽  
Shock Resistance

Deposition of NiCr-CrC(20NiCr) metal matrix composite (MMCs) coating have been applied on the substrate of boiler tubes material with High Velocity Oxygen Fuel (HVOF) thermal spray method and constant parameter. Variation of particle size and composition on MMCs was conducted to determined the optimum conditions for boiler applications. Microvickers hardness, metallography and thermal shock resistance testing were investigated. The best performance for boiler tubes application is MMC NiCr-CrC(20NiCr) with 270 mesh of NiCr particles size and 60:40 of composition as evidence by the highest of hardness value (410 Hv) and slightly of discoloration after thermal shock resistance with two variation cooling medium. While at MMC NiCr-CrC(20NiCr) with 70:30 variation composition, coating hardness value will decrease in line with the smaller of particle size of NiCr.

AN INFLUENCE OF SELECTED MECHANICAL PARAMETERS OF MMC ON THE THERMAL SHOCK RESISTANCE

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5807-5812
Author(s):  
DARIUSZ RUDNIK ◽  
ZBIGNIEW KOWALEWSKI ◽  
KRYSTYNA PIETRZAK ◽  
ANDRZEJ WOJCIECHOWSKI
Keyword(s):  
Thermal Shock ◽  
Metal Matrix ◽  
Thermal Shock Resistance ◽  
Mechanical Characteristics ◽  
Squeeze Casting ◽  
Matrix Composites ◽  
Mechanical Parameters ◽  
Theoretical Evaluation ◽  
Microscopy Method ◽  
Shock Resistance

The results concerning the basic mechanical properties are presented for selected metal matrix composites (MMC). Three types of composites were produced by means of squeeze casting and next heat treatment. An influence of reinforcement type on the crack appearance in matrix and composite material was analyzed. Theoretical evaluation of the thermal shock resistance was proposed on the basis of conventional mechanical characteristics. Moreover, the qualitative metallographic investigations were carried out using optical microscopy method. A good consistence between the theoretical evaluation of thermal shock resistance and experimental data was achieved.

Thermal shock resistance of tri‐layer Yb 2 SiO 5 /Yb 2 Si 2 O 7 /Si coating for SiC and SiC‐matrix composites

2018 ◽  
Vol 101 (10) ◽  
pp. 4743-4752 ◽  
Author(s):  
Xin Zhong ◽  
Yaran Niu ◽  
Hong Li ◽  
Haijun Zhou ◽  
Shaoming Dong ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Matrix Composites ◽  
Shock Resistance

scholarly journals Optimization of Properties for Alumina-Spinel Refractory Castables by CMA (CaO-MgO-Al2O3) Aggregates

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3050
Author(s):  
Hai Tang ◽  
Chunxue Li ◽  
Jianying Gao ◽  
Bruno Touzo ◽  
Chunfeng Liu ◽  
...  
Keyword(s):  
Particle Size ◽  
Bulk Density ◽  
Thermal Shock ◽  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Thermal Shock Resistance ◽  
Thermal Fatigue Resistance ◽  
Spinel Refractory ◽  
Refractory Castables ◽  
Shock Resistance

Aiming at optimizing properties of alumina-spinel refractory castables, coarse corundum particles were replaced partially with the particles of a novel porous multi-component CMA (CaO-MgO-Al2O3) aggregate in the same size. Properties including the bulk density, apparent porosity, strength, slag corrosion resistance, thermal shock resistance and thermal fatigue resistance of alumina-spinel refractory castables containing CMA aggregates were evaluated contrastively. The results demonstrated that the incorporation of CMA aggregates can significantly improve thermal shock resistance and thermal fatigue resistance of castables, although companying with slight decrease in the bulk density and strength. Moreover, slag penetration resistance of castables can also be enhanced by CMA aggregates with appropriate particle size. The influence of CMA aggregates on properties of alumina-spinel refractory castables depended strongly on their particle size.

scholarly journals Crucial effect of SiC particles on in situ synthesized mullite whisker reinforced Al2O3-SiC composite during microwave sintering

2017 ◽  
Vol 11 (2) ◽  
pp. 106-112 ◽  
Author(s):  
Xudan Dang ◽  
Meng Wei ◽  
Rui Zhang ◽  
Keke Guan ◽  
Bingbing Fan ◽  
...  
Keyword(s):  
Particle Size ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Hot Spot ◽  
Microwave Sintering ◽  
Sic Particles ◽  
Shock Resistance ◽  
Sic Particle

Mullite whisker reinforced Al2O3-SiC composites were in situ synthesized by microwave sintering at 1500?C for 30min. The influence of SiC particle size on heating process and properties of Al2O3-SiC composite were investigated. The XRD and SEM techniques were carried out to characterize the samples. The thermal shock resistance and flexural strength of the samples were examined through water quenching and three-point bending methods, respectively. It was found that the bridging of mullite whisker appeared between Al2O3 and SiC particles which enhanced the thermal shock resistance. A so-called local hot spot effect was proposed dependent on the coupling of SiC particles with microwave, which was the unique feature of microwave sintering. The maximal thermal shock resistance and flexural strength were obtained for the samples with SiC particle size of ~5?m.

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.

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