(中南大學(xué) 粉末冶金國家重點實驗，長沙 410083)
摘 要: 以短炭纖維、炭粉、Si粉、樹脂和粘結(jié)劑為原料，采用溫壓−原位反應(yīng)法(WC-ISR)制備C/C-SiC制動材料，研究該材料的壓縮性能及其破壞機理。結(jié)果表明：C/C-SiC制動材料的縱向壓縮強度可達(dá)118.2 MPa，縱向壓縮破壞表現(xiàn)為韌性斷裂，以對角剪切破壞方式為主；橫向壓縮強度可達(dá)86.9 MPa，橫向壓縮破壞主要表現(xiàn)為脆性斷裂，以多層復(fù)合剪切破壞方式為主。C/C-SiC制動材料的壓縮性能分別隨炭纖維和SiC含量的增加而增大，且炭纖維含量的影響更加顯著；但隨基體炭含量的增加而降低。
關(guān)鍵字: C/C-SiC；溫壓−原位反應(yīng)法；壓縮性能；破壞機理
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:C/C-SiC braking composites were fabricated by warm compressed in-situ reacted process (WC-ISR) with short carbon fibers, graphite powder, Si powder and resin. The compressive properties and fracture mechanism of C/C-SiC braking composites were investigated. Rules about the compressive properties and fracture mechanism of the C/C-SiC composites were ascertained. The results show that the value of vertical compressive strength can reach 118.2 MPa, whose destruction belongs to toughness fraction mechanism by shear stress and is mostly destroyed on the cross. As for the parallel compressive strength, it’s value can reach 86.9 MPa, whose destruction belongs to brittleness fracture mechanism and is destroyed by multilayer complex split. The compressive properties increase along with the increase of adding carbon fiber and SiC matrix separately, and carbon fiber carries more weight. However, the more the carbon matrix, the lower the compressive properties.
Key words: C/C-SiC; warm compressed in-situ reacted process; compressive properties; fracture mechanism
