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以ZrSi_2颗粒填充硼酚醛树脂制备了一种耐高温且裂解后结构较为完整的泡沫复合材料。研究了ZrSi_2颗粒质量分数对泡沫复合材料固化机制、高温裂解行为及裂解前后压缩性能的影响,并分析了ZrSi_2颗粒对泡沫复合材料裂解产物的增强机制。结果表明:添加的ZrSi_2颗粒虽未参与硼酚醛树脂的固化交联,但会和硼酚醛树脂裂解放出的气体挥发物发生化学反应,提高了裂解产物的残炭率和压缩比强度。当添加的ZrSi_2颗粒质量为硼酚醛树脂质量的10%时,裂解产物的残炭率和压缩比强度提高最为显著。ZrSi_2/硼酚醛泡沫经过裂解后,ZrSi_2颗粒作为第二相粒子钉扎在裂解产物的孔壁上,化学反应使得部分裂解气体挥发物被吸收并转化为固相产物,明显减少的缺陷提高了裂解产物的力学性能。
A kind of foam composite material with high temperature resistance and relatively intact structure after pyrolysis was prepared by filling ZrB 2 particles with boron phenolic resin. The effects of ZrSi 2 particles mass fraction on the curing mechanism, pyrolysis behavior and compressive properties of foam composites before and after pyrolysis were investigated. The enhancement mechanism of ZrSi 2 particles on pyrolysis products of foam composites was also studied. The results show that although the added ZrSi 2 particles do not participate in the curing cross-linking of the boron phenolic resin, they react chemically with the gaseous volatiles released from the pyrolysis of the boron phenolic resin to increase the residual char yield and compressive strength of the cracked product. When the mass of ZrSi 2 particles added is 10% of the mass of boron phenolic resin, the increase of residual char yield and compressive strength of pyrolyzed product is the most significant. ZrSi 2 / boron phenolic foam after cracking, ZrSi 2 particles as the second phase particles pinning the pore wall of the cracked product, the chemical reaction so that part of the volatile gas is absorbed and converted into solid phase product, a significant reduction of defects improved cracking Mechanical properties of the product.