Moisture-proof and enhanced effect of inorganic coating on porous Si₃N₄ ceramic

Abstract

Inorganic coating was fabricated on the surface of the porous Si₃N₄ ceramic by polymer derived (PD) and spraying technology, via using vinyl-polysilazane (PSN-1) as a preceramic polymer and Si₃N₄ and lithium aluminosilicate (LAS) powders as fillers. The phase and microstructure of the coatings were analyzed by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM), respectively. The effect of the coatings on mechanical property and humidity resistance of the porous Si₃N₄ ceramic was investigated. The experimental results showed that we successfully fabricated the uniform and dense coating which preferably combined with the substrate upon the addition of fillers. The bending strength of the porous Si₃N₄ ceramic sprayed the coating increased by more than 18%, and the surface hardness increased by 1.7 times. The apparent porosity of the materials reduced by an average of 97.7%, and water absorption was below 0.5%. Therefore, the prepared coating with preferable density had an obviously moisture-proof and enhanced effect on the porous Si₃N₄ ceramic.

Keywords

inorganic coating / Si₃N₄ ceramic / moisture-proof and enhanced coating / polymer derived / radome

References

[1] Zhang DH, Li Y, Gao W, . Development and Application of High Temperature Radome Materials[J]. Aerospace Materials & Technology, 2001 1-3.

[2] Li JL, Jiang HY, Niu JY State of the Art of Porous Ceramic Wavetransmitting Materials[J]. Bull. Chin. Ceram. Soc., 2006 91-94.

[3] Cheng CB, Wang CH, Wang HS, . Reseach Progress of Ceramic Radome Inorganic Coating[J]. Bull. Chin. Ceram. Soc., 2012, 31(5): 1 161-1 164.

[4] Pivin JC, Colombo P Ceramic Coatings by Ion Irradiation of Polycarbosilanes and Polysiloxanes: Part II Hardness and Thermochemical Stability[J]. J. Mater. Sci., 1997, 32: 6 175-6 182.

[5] Hu LF, Li MS, Xu CH, . Perhydropolysilazane Derived Silica Coating Protecting Kapton from Atomic Oxygen Attack[J]. The Solid Films, 2011, 520(3): 1 063-1 068.

[6] Zheng Y, Wang SB The effect of SiO₂-doped Boron Nitride Multiple Coatings on Mechanical Properties of Quartz Fibers[J]. Applied Surface Science, 2012, 258(7): 2 901-2 905.

[7] Monti M, Bianco BD, Bertoncello R, . New Protective Coatings for Ancient Glass: Silica Thin-films from Perhydropolysilazane[J]. J. Cult. Herit., 2008, 9: 143-145.

[8] Iwamoto Y, Sato K, Kato T, . A Hydrogen-permselective Amorphous Silica Membrane Derived from Polysilazane[J]. J. Eur. Ceram. Soc., 2005, 25(23): 257-264.

[9] Chen SJ, Zhang JQ, Su LH, . Preparation and Anti-oxidation Behavior of Ceramic Coating Prepared by Photo Catalytic Pyrolysis of Thiol-ene precursor[J]. Materials protection, 2010, 43(3): 4-6.

[10] Liu J, Zhang LT, Hu F, . Polymer-derived Yttrium Silicate Coatings on 2D C/SiC Composites[J]. J. Eur. Ceram. Soc., 2013, 33: 433-439.

[11] Torrey JD, Bordia RK Mechanical Properties of Polymer-derived Ceramic Composite Coatings on Steel[J]. J. Eur. Ceram. Soc., 2008, 28: 253-257.

[12] Hu LF, Li MS, Xu CH, . A Polysilazane Coating Protecting Polyimide from Atomic Oxygen and Vacuum Ultraviolet Radiation Erosion[J]. Surface & Coatings Technology, 2009, 203: 3 338-3 343.

[13] Gardelle B, Duquesne S, Vu C, . Thermal Degradation and Fire Performance of Polysilazane-based Coatings[J]. Thermochim. Acta, 2011, 519: 28-37.

[14] Xiao FY, Zhang ZB, Zeng F, . Fabrication of Ceramic Coatings from Polysilazane/Aluminum: Effect of Aluminum Content on Chemical Composition, Microstructure, and Mechanical Properties[J]. Ceram. Int., 2014, 40: 745-752.

[15] Morlier A, Cros S, Garandet JP, . Thin Gas-barrier Silica Layers from Perhydropolysilazane Obtained Through Low Temperature Curings: A Comparative Study[J]. Thin Solid Films, 2012, 524: 62-66.

[16] Colombo P, Mera G, Riedel R, . Polymer-Derived Ceramics: 40 Years of Research and Innovation in Advanced Ceramics [J]. J. Am. Ceram. Soc., 2010, 93(7): 1 805-1 837.

[17] Wang K, Günthner M, Motz G, . High Performance Environmental Barrier Coatings, Part II: Active Filler Loaded SiOC System for Superalloys[J]. J. Eur. Ceram. Soc., 2011, 31: 3 011-3 020.

[18] Zhang XL, Li Y Effects of Wollastonite on Properties of Lithium Aluminosilicate Crystallite Glaze[J]. J. Chin. Ceram. Soc., 2010, 38(6): 1 093-1 097.

[19] Liu J, Zhang LT, Yang J, . Fabrication of SiCN-Sc₂Si₂O₇ Coatings on C/SiC Composites at Low Temperatures[J]. J. Eur. Ceram. Soc., 2012, 32: 705-710.