Effect of zirconia on ablation mechanism of asbestos fiber/phenolic composites in oxyacetylene torch environment

Mirzapour, Mir Asad; Haghighat, Hasan Rezaei; Eslami, Zahra

doi:10.1016/j.ceramint.2013.05.034

Cited by 33 publications

(10 citation statements)

References 31 publications

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“…According to reaction (3–7), after decomposition of (MgCO 3 ) 4 ·Mg(OH) 2 ·5H 2 O, Mg 2 SiO 4 , and MgSiO 3 occurred by increased heating 30,31 . In the temperature condition of the ablation test (2000°C–3000°C), a large amount of Mg 2 SiO 4 and MgSiO 3 could melt and evaporate, which played a positive role in dissipating heat and hindering oxidation during the ablation process 28 …”

Section: Resultsmentioning

confidence: 99%

“…It has been found that MgCO 3 can decompose and release carbon dioxide gas in a high‐temperature environment, which is close to the thermal degradation temperature of vinyl silicone rubber 22,23 . Meanwhile, it has been reported that the introduction of metallic oxides, such as Al 2 O 3 , ZnO, CaO, and ZrO 2 , can react with compounds produced by the oxidative degradation of polymer matrix or other fillers to form high‐temperature resistant materials, which is conducive to the enhancement on thermal insulation performance during heat treatment 24‐28 . Therefore, MgO generated by the decomposition of MgCO 3 may provide insulation to the underlying matrix.…”

Section: Introductionmentioning

confidence: 99%

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In situ construction of fiber‐supported micro‐porous char structure to enhance anti‐ablative performance of silicone rubber composites

Huang

Kong

Yan

et al. 2021

Polymers for Advanced Techs

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Ablation‐resistant polymeric composites play a crucial role in the thermal protection system for the entire aerospace industry. Constructing a stable char layer especially with low thermal conductivity is essential to enhance the ablation resistant properties of polymer‐based ablatives. In this article, basic magnesium carbonate (MgCO3) and carbon fibers (CFs) were introduced to silicone rubber with an aim of building fiber‐supported micro‐porous char structure in situ, thereby improving ablation resistance properties. Thermogravimetric analyses revealed that the addition of MgCO3 significantly increased the char residue of the composites. Oxyacetylene torch tests indicated that the addition of MgCO3/CFs greatly improved the thermal insulation of the composites, and the linear ablation rates of the composites were reduced by 30.76% compared to the virgin silicone rubber. Shore A hardness and thermal conductivity tests revealed that composites with 10 phr MgCO3 exhibited a char structure with proper strength and low thermal conductivity. SiC, Mg2SiO4, and MgSiO3 were produced in the MgCO3/CFs‐modified composites, as characterized by X‐ray diffraction. Combined with macro lens and scanning electron misroscopy, it was proven that a fiber‐supported micro‐porous and thermally insulated char structure was conducive to the improvement of the ablation properties, which can be applied to aerospace systems for thermal shielding applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In situ construction of fiber‐supported micro‐porous char structure to enhance anti‐ablative performance of silicone rubber composites

Huang

Kong

Yan

et al. 2021

Polymers for Advanced Techs

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“…Moreover, the results show that the Al elements inside the crack of the insulation layer also had no apparent change compared with the raw material before the experiment as shown in Table 3. According to the thermal insulating mechanism of the high silica/ phenolic resin composites [13,14], the phenolic resin of the insulation layer began to pyrolyze and decompose into low molecular hydrocarbons and gases difficult to ignite when the pyrolysis temperature of the resin was reached. As the temperature further rose, the stable carbonized layer was formed, and the reinforcement fibers inside the heat-insulating layer were exposed.…”

Section: Analysis Of Sedimentmentioning

confidence: 99%

Effect of Reinforcement Fiber Arrangement on Thermal and Mechanical Properties of High Silica/Phenolic Resin Insulation Layer

Hui

Wen

2021

International Journal of Aerospace Engineering

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The failure of the high silica/phenolic resin insulation layer under extreme thermal conditions has become an important reason for the trouble of solid rocket motors. A great number of studies have shown that the arrangement of reinforcement fibers is a significant factor in the failure of fiber-reinforced plastic. In this paper, the thermal and mechanical properties of the high silica/phenolic resin insulation layer with different arrangements were analyzed, and the causal relationship between the failure of the insulation layer and the arrangement of reinforcement fibers was given. Two types of heat-insulating layers with strong arrangement and weak arrangement were designed. After the SRM firing test, it is concluded that the essential reason for the failure of the insulation layer is the strength anisotropy caused by the weak arrangement of reinforcement fibers. Besides, the reinforcement fibers of strong arrangement are distributed in all directions, which compensates for the axial strength defects of the weakly arranged insulation layer.

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“…Zirconia may be the main developmental direction of high temperature thermal protection materials, due to their high temperature resistance (above 2000°C), high strength and toughness, low thermal conductivity (about 2 W m −1 K −1 ), oxidation resistance and other excellent properties [16]. Mirzapour et al [17] used micron-size zirconium oxide (ZrO 2 ) to improve the thermal stability and ablation properties of asbestos fibre/phenolic composites and to reduce their final cost, and the results showed that the linear and mass ablation rates of the composites after adding 14 wt-% ZrO 2 decreased by 58% and 92%, respectively. However, the study on the use of zirconia fibre reinforced ablation resistant composites has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

“…Mirzapour et al. [17] used micron-size zirconium oxide (ZrO 2 ) to improve the thermal stability and ablation properties of asbestos fibre/phenolic composites and to reduce their final cost, and the results showed that the linear and mass ablation rates of the composites after adding 14 wt-% ZrO 2 decreased by 58% and 92%, respectively. However, the study on the use of zirconia fibre reinforced ablation resistant composites has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

The influence of zirconia fibre on ablative composite materials

Zou

Qin

Tian

et al. 2019

Plastics, Rubber and Composites

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Zirconia fibres have excellent high temperature ablation resistance and have been widely used in ablative materials. In this paper, zirconia fibre was used for reinforcing the ablative composite materials to study the influence of zirconia fibre had upon the mechanical properties and the high temperature ablation properties of such composites. The results showed that the bending strength of the material was also good and reached a maximum of 13.05 MPa. After sintering at 1400°C, the bending strength was also great which could reach 13.05 MPa. In addition, the corrosion resistance of the composites was excellent and the oxygen-acetylene line ablation rate was 0.03 mm s −1 when the fibre content was 30 wt-%.

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Effect of zirconia on ablation mechanism of asbestos fiber/phenolic composites in oxyacetylene torch environment

Cited by 33 publications

References 31 publications

In situ construction of fiber‐supported micro‐porous char structure to enhance anti‐ablative performance of silicone rubber composites

In situ construction of fiber‐supported micro‐porous char structure to enhance anti‐ablative performance of silicone rubber composites

Effect of Reinforcement Fiber Arrangement on Thermal and Mechanical Properties of High Silica/Phenolic Resin Insulation Layer

The influence of zirconia fibre on ablative composite materials

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