自制大分子钛酸酯表面改性剂对纳米Si_3N_4粉末的表面化学修饰

Surface Modification of Nano-size Si_3N_4 with Home-made Macromolecular Titanate Surface Modifier

采用自制的大分子钛酸酯表面改性剂对纳米Si3N4进行表面包覆处理,对处理前后的纳米Si3N4粉末运用TEM、FT-IR、TGA等进行了表征。结果表明,大分子钛酸酯表面改性剂包覆在纳米Si3N4粉体表面,并与其发生了化学作用,有效地阻止了纳米Si3N4粉体的团聚,在大分子钛酸酯表面改性剂质量分数为11%时,纳米Si3N4粒子粒径较小,粒径分布最窄。

Nano-Si3 N4 particles were coated using home-made macromolecular titanate as surface modifier. The structure and surface properties of modified and as-provided nano- Si3 N4 were systematically investigated by TEM,FT-IR, and TGA. The results indicated that the macromolecular titanate deposited on the surface of nano-Si3N4 particles by chemical reaction, effectively preventing agglomeration of nano-Si3N4 particles. When the mass fraction of the added macromolecular titanate surface modifier was 11（wt）%, the particle diameter of the nano-size Si3 N4 was the smallest and its size distribution was the narrowest.