Abstract
Heat-resistant syntactic foams with relative high compressive strength, elastic modulus and low density were successfully fabricated through binding hollow glass microsphere by phosphate adhesive. The effects of additive B4C on the mechanical behavior of syntactic foams were investigated. The bulk density, compressive strength and elastic modulus of the syntactic foams could be tailored by varying the content of additive and the sintering schedule. The results revealed that the additive B4C was useful in regulating the mechanical behavior of the syntactic foams due to the volume compensation from B4C's oxidation and the formation of glassy state B2O3, which promoted the bonding of hollow glass microspheres. The compressive strength, bulk density, and elastic modulus of the syntactic foams were 10.80–20.38MPa, 0.525–1.198g/cm3 and 0.81–1.23GPa, respectively, when the samples containing 5–15wt.% B4C sintered at 700–900°C for 2h. Therefore, the heat-resistant syntactic foams possess the potential application in aerospace, aviation and oil exploitation.
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