Effect of Heat Treatment on the Microstructure and Phase Composition of ZrB2–MoSi2 Coating

Composite ZrB2–MoSi2 coating modified by Y2O3 and Al was prepared by a new multi-chamber detonation accelerator (MCDS) on carbon/carbon composites. Postdeposition heat treatment of the samples at 1500 °C for 1 and 6 h was carried out in air. The effect of heat treatment on the microstructure and phase composition of the ZrB2–MoSi2 coating was investigated by scanning electron microscopy and X-ray diffraction phase analysis. The as-sprayed coating presented as a dense lamellar structure, composed of m-ZrO2, t-ZrO2, some hexagonal ZrB2, and cubic Al phases. The m-ZrO2, c-ZrO2, and h-(α-Al2O3) formed at 1500 °C. The coatings after heat treatment (1 and 6 h) exhibited a structure without cracks. The porosity (~1%) of the coating did not change after heat treatment. Thin, continuous, silica-rich film covered the surfaces of ZrO2 and Al2O3 particles, and could have played a role during heat treatment by acting as a grain lubricant for particle rearrangement.

[1]  Abou Bakr Elshalakany,et al.  Comparative study between high-velocity oxygen fuel and flame spraying using MCrAlY coats on a 304 stainless steel substrate , 2019, Journal of Materials Research and Technology.

[2]  Haibo Ouyang,et al.  ZrB2 particles reinforced glass coating for oxidation protection of carbon/carbon composites , 2019, Journal of Advanced Ceramics.

[3]  Min Liu,et al.  Bimodal microstructure ZrB2-MoSi2 coating prepared by atmospheric plasma spraying for carbon/carbon composites against long-term ablation , 2017 .

[4]  M. Kovaleva,et al.  Zircon-Based Ceramic Coatings Formed by a New Multi-Chamber Gas-Dynamic Accelerator , 2017 .

[5]  Yazheng Yang,et al.  Ablation behavior and mechanism of double-layer ZrB2-based ceramic coating for lightweight carbon-bonded carbon fiber composites under oxyacetylene flame at elevate temperature , 2017 .

[6]  Wang Lu,et al.  Improvement of the Adhesion Strength of MoSi2-ZrB2 Coating by Optimizing Particle Spraying and Subsequent Heat Treatment , 2016, Journal of Thermal Spray Technology.

[7]  Wang Qing,et al.  ZrB2-SiC as a protective coating for C/SiC composites: Effect of high temperature oxidation on thermal shock property and protection mechanism , 2016 .

[8]  Zhong Lin Wang,et al.  Comparison of ZrB2-MoSi2 Composite Coatings Fabricated by Atmospheric and Vacuum Plasma Spray Processes , 2016, Journal of Thermal Spray Technology.

[9]  L. Min,et al.  A Oxidation-resistance of ZrB 2 -MoSi 2 Composite Coatings Prepared by Atmospheric Plasma , 2015 .

[10]  Hejun Li,et al.  Ablation resistance of ZrB2–SiC coating prepared by supersonic atmosphere plasma spraying for SiC-coated carbon/carbon composites , 2014 .

[11]  Maher I. Boulos,et al.  Thermal Spray Fundamentals: From Powder to Part , 2014 .

[12]  C. Ding,et al.  Dense ZrB2–MoSi2 composite coating fabricated by low pressure plasma spray (LPPS) , 2013 .

[13]  E. Danshina,et al.  Deposition and characterization of Al2O3 coatings by multi-chamber gas-dynamic accelerator , 2013 .

[14]  Li Wei,et al.  ZrB2/SiC as a protective coating for C/SiC composites: Effect of high temperature oxidation on mechanical properties and anti-ablation property , 2013 .

[15]  Николай Яковлевич Василик,et al.  Method for gas-dynamic detonating speedup of powders and device for its implementation , 2012 .

[16]  X. Xiong,et al.  Preparation and oxidation property of ZrB2-MoSi2/SiC coating on carbon/carbon composites , 2011 .

[17]  A. Bressiani,et al.  Microstructure and mechanical properties of thermal sprayed nanostructured Cr3C2-Ni20Cr coatings , 2008 .

[18]  Donald M. Curry,et al.  Oxidation microstructure studies of reinforced carbon/carbon , 2006 .

[19]  Xiaohong Shi,et al.  Silicon carbide coating to protect carbon/carbon composites against oxidation , 2005 .

[20]  D. Sciti,et al.  Oxidation behavior of a pressureless sintered ZrB_2–MoSi_2 ceramic composite , 2005 .

[21]  Lalit M. Manocha,et al.  High performance carbon-carbon composites , 2003 .

[22]  Monica Ferraris,et al.  Multilayer coating with self-sealing properties for carbon-carbon composites , 2003 .

[23]  C. J. Li,et al.  Relationships between the microstructure and properties of thermally sprayed deposits , 2002 .

[24]  Soojin Park,et al.  The effects of MoSi2 on the oxidation behavior of carbon/carbon composites , 2001 .

[25]  G. Blount,et al.  Carbon-carbon composites: a summary of recent developments and applications , 1997 .

[26]  J. Sheehan,et al.  Carbon-Carbon Composites , 1994 .

[27]  G. Devi,et al.  Carbon-Carbon Composites -An Overview , 1993 .