scholarly journals Improved Ablation Resistance of Silicone Rubber Composites by Introducing Montmorillonite and Silicon Carbide Whisker

Materials ◽  
2016 ◽  
Vol 9 (9) ◽  
pp. 723 ◽  
Author(s):  
Guangwu Zhang ◽  
Fuzhong Wang ◽  
Zhixiong Huang ◽  
Jing Dai ◽  
Minxian Shi
Keyword(s):  
Silicon Carbide ◽  
Silicone Rubber ◽  
Rubber Composites ◽  
Silicon Carbide Whisker ◽  
Ablation Resistance

Study on the thermal stability and ablation properties of metallic oxide-filled silicone rubber composites using uniform design method

2016 ◽  
Vol 36 (8) ◽  
pp. 805-811 ◽  
Author(s):  
Rui Li ◽  
Cheng Zhou ◽  
Lin Yu ◽  
Yang Chen ◽  
Huawei Zou ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Silicone Rubber ◽  
Design Method ◽  
Uniform Design ◽  
Ablation Process ◽  
Rubber Composites ◽  
Metallic Oxide ◽  
Ablation Resistance ◽  
Uniform Design Method ◽  
Thermal Stability Property

Abstract The thermal stability and ablation properties of silicone rubber composites filled with Fe2O3, SnO2, CuO, MgO, and Al2O3 were researched using thermogravimetric analysis (TGA) and the oxyacetylene torch test. The effecting laws of metallic oxide on the thermal stability and ablation properties of silicone rubber composites were analyzed by uniform design method. TGA indicated that the thermal degradation process of silicone rubber composites took a two mass loss steps. The effecting order of metallic oxide on enhancing thermal stability property of silicone rubber composites in step 1 was MgO>SnO2> Fe2O3>Al2O3>CuO, whereas the order in step 2 was CuO> SnO2>MgO>Fe2O3>Al2O3. Furthermore, Fe2O3 and SnO2 had an evident synergistic effect on enhancing the thermal stability property and residual carbon of silicone rubber composites. The oxyacetylene torch test showed that the effecting order of metallic oxide on increasing ablation resistance property of silicone rubber composites in ablation process was CuO>MgO>Fe2O3>SnO2>Al2O3. Moreover, the line ablation rate of specimen 2 was 0.0499, which indicated that it had the best ablation resistance among all uniform samples. Furthermore, scanning electron microscopy also showed that the porous ceramic layer became much denser after the ablation process, and this will significantly improve the ablation resistance property.

scholarly journals Effects of Zirconium Silicide on the Vulcanization, Mechanical and Ablation Resistance Properties of Ceramifiable Silicone Rubber Composites

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 496 ◽  
Author(s):  
Jiuqiang Song ◽  
Zhixiong Huang ◽  
Yan Qin ◽  
Honghua Wang ◽  
Minxian Shi
Keyword(s):  
Thermal Conductivity ◽  
Silicone Rubber ◽  
Thermal Protection ◽  
Permanent Deformation ◽  
Ablation Rate ◽  
Decomposition Temperature ◽  
Rubber Composites ◽  
Initial Decomposition Temperature ◽  
Ablation Resistance ◽  
Zirconium Silicide

Ceramifiable silicone rubber composites play important roles in the field of thermal protection systems (TPS) for rocket motor cases due to their advantages. Ceramifiable silicone rubber composites filled with different contents of ZrSi2 were prepared in this paper. The fffects of ZrSi2 on the vulcanization, mechanical and ablation resistance properties of the composites were also investigated. The results showed that the introduction of ZrSi2 decreased the vulcanization time of silicone rubber. FTIR spectra showed that ZrSi2 did not participate in reactions of the functional groups of silicone rubber. With the increasing content of ZrSi2, the tensile strength increased first and then decreased. The elongation at break decreased and the permanent deformation increased gradually. The thermal conductivity of the composite increased from 0.553 W/(m·K) to 0.694 W/(m·K) as the content of the ZrSi2 increased from 0 to 40 phr. In addition, the thermal conductivity of the composite decreased with the increase of temperature. Moreover, thermal analysis showed that the addition of ZrSi2 increased the initial decomposition temperature of the composite, but had little effect on the peak decomposition temperature in nitrogen. However, the thermal decomposition temperature of the composite in air was lower than that in nitrogen. The addition of ZrSi2 decreased the linear and mass ablation rate, which improved the ablative resistance of the composite. With the ZrSi2 content of 30 phr, the linear and mass ablation rate were 0.041 mm/s and 0.029 g/s, decreasing by 57.5% and 46.3% compared with the composite without ZrSi2, respectively. Consequently, the ceramifiable silicone rubber composite filled with ZrSi2 is very promising for TPS.

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