Abstract:A Nicalon SiC fiber reinforced 7740(Corning Code) boro-silicate glass composite was made by slurry-infiltration-hot-pressing process. The interfacial strength(τ_s) was measured using pyramidal diamond indentation method and micro de-bonding method respectively. The relationship between interfacial strength and various factors, such as, the heat-exposure time(t) of the fiber at 600℃in air, the fiber diameter(D_f), and the spacing from the tested fiber to its nearest neighbouring fiber(S_m). The agreements and the difference of the two methods were discussed. It was discovered that, in the experiment range,τ_s increased as t and S_m rising and decreased as D_f increasing. In addition, the relationship between interfacial strength and fracture toughness(K_Ⅰc) was also studied, it was also discovered that a relatively stronger interfacial strength led to a lower fracture toughness of composite.

Key words: composites　interfacial strength　SiC fiber