Preparation And Properties Of ZrO_2(P) And SiO_2(sf) Reinforced Phenolic Resin Composites

ZrO_2(p)+SiO_2(sf) reinforced phenolic resin matrix composites were fabricated by using fiber-glass, ZrO2 powders and phenolic resin. The ablation mechanism fabrication techniques for the composites was investigated by means of DSC, XRD, SEM and TEM techniques. The influence of temperature, pressure and component ratio on formability of the composite were investigated. And also effect of the component ratio on the performance of composites was studied, and the characterization technique of ablation properties was discussed.The results indicated that formability of the composite was much depended on the temperature schedule. When loading the stuff into mould under 130℃rather than 120℃, the tensile strength and density of the composites are much higher. Higher temperature can make small molecule volatilizing easier and the stuff flow easier, thus, better formability is obtained.When fiber content increased, flexural strength and tensile strength of the SiO_2(sf)/resin composite enhanced first and then became lower. So did the (ZrO_2(p)+SiO_2(sf))/resin composite. Contrast to fiber/resin composite, the composites added with ZrO2 particles has higher flexural strength. The highest was 195MPa, when ZrO2(p) content reached to 7 percent. Incorporation of the ZrO₂ particles didn't enhance the ablation rate clearly but made it more ideal. When ZrO_2(p) content reached to 5 percent, mass and liner ablation rates of the composites were both lowest.The ablation mechanism was investigated by means of DSC, XRD, SEM and TEM techniques. The results indicated that the ablation mechanism for the composites related to degree of cross linking of the phenolic resin, melting of the SiO_2(sf) and phase transition of ZrO2.