Enhanced Ablation Resistance of Glass Beads and ZrB2 Modified SiO2 (f)-Phenolic Composites
LI Maoyuan1,2, LU Lin2, DAI Zhen2, HONG Yiqiang2, CHEN Weiwei3, ZHANG Yuping3, QIAO Yingjie1
1 Colleage of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001 2 Beijing System Design Institute of Electro-mechanic Engineering, Beijing 100854 3 Department of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081
Abstract: Glass beads and ZrB2 particles were introduced into SiO2(f)-Phenolic (S-Ph) heat resistant composite, for the sake of enhancing its erosion resistance and ablative properties. The ablation resistance of the glass beads and ZrB2 modified S-Ph composite were measured by oxygen-acetylene ablation test, and the effects of glass beads and ZrB2 particles on the ablation mechanism and ablation resistance of full-density and low-density S-Ph composites were analyzed and compared. As could be seen from the results, adding appropriate amount of ZrB2 to the low-density S-Ph composites contributed to the formation of a cladding layer on the ablative surface, which was highly protective to the carbide layer and the matrix material, and capable of reducing the linear ablation rate and the mass ablation rate. The formation of cladding layer on the surface was derived from the “pining-effect” produced by ZrO2in melted silica, as well as the reduced surface energy of melted silica by B2O3. The introduction of ZrO2 particles into the full-density S-Ph composites induced the formation of porous ZrO2layer in the ablative process, which effectively isolate the carbide layer from the ablative environment. Nevertheless, the ZrO2 layer did not spread by melting and weakly adhered to the carbide layer, therefore it is apt to peel off in the ablative process.
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2019, Vol. 33 
