SiBOC cellular ceramic foams were realized by precipitating methylvinylborosiloxane (MVBS) oligomers within reticulated poly(melamine-formaldehyde) (PMF) foam followed by drying and ceramization. The conventional method of impregnation-squeezing-drying exhibited MVBS starvation at the foam-core as the MVBS oligomers migrate to the surface due to its high solubility in ethanol and small cell size (200 ppi) of the PMF foam. In contrast, the precipitation of the MVBS oligomers on the web of the PMF foam prevents their migration to the surface. Ceramization by heat treatment at 1500 °C in inert atmosphere resulted in amorphous SiBOC cellular foams with cells in the size range of 20–400 μm. The density, compressive strength and thermal conductivity of the SiBOC foams were modulated in the ranges of 0.18−0.39 gcm⁻³, 0.3 to 0.87 MPa and 0.08−0.13 Wm^-1 K^-1, respectively, by using MVBS solution of concentrations in the range of 37–73 wt.%. The SiBOC foams remain amorphous up to 1600 °C beyond which extensive crystallization and phase separation occurs. Exposure of the SiBOC foam bodies at 1300 °C in air atmosphere showed negligible (∼ 0.2 wt.%) weight gain due to oxidation, indicating its potential as thermal protection material in oxidizing atmosphere.

通过在网状聚（三聚氰胺-甲醛）（PMF）泡沫中沉淀甲基乙烯基硼硅氧烷（MVBS）低聚物，然后进行干燥和陶瓷化来实现SiBOC多孔陶瓷泡沫。常规的浸渍-挤压-干燥方法由于其在乙醇中的高溶解度和PMF泡沫的小泡孔大小（200 ppi）而使MVBS低聚物迁移到表面，因此在泡沫芯处出现MVBS饥饿。相反，MVBS低聚物在PMF泡沫纤维网上的沉淀阻止了它们迁移到表面。通过在惰性气氛中于1500°C进行热处理来进行陶瓷化处理，从而形成无定形的SiBOC多孔泡沫，其泡孔尺寸在20-400μm之间。SiBOC泡沫的密度，抗压强度和导热系数在0.18-0.39 gcm ^-3的范围内调节使用浓度范围为37-73 wt。％的MVBS溶液，分别获得0.3至0.87 MPa和0.08-0.13 Wm ^-1 K ^-1的能量。SiBOC泡沫在1600°C时仍保持无定形，超过此温度就会发生大量结晶和相分离。SiBOC泡沫体在1300°C的空气环境中暴露，由于氧化而导致的重量增加可忽略不计（约0.2 wt。％），表明其在氧化气氛中作为热保护材料的潜力。