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在立方氮化硼聚晶复合材料制备中,为改善晶体相的偏聚,其思路之一便是将晶体相与粘接相预先制备成带有核-壳结构的原料。先采用Pirnaha溶液对c BN进行羟基化改性,在改善其亲水性,使其容易分散并带有电荷的基础上,再用stober法进行硅氧包覆处理,在氨水和少量水的作用下,以乙醇作为分散剂,用TEOS硅氧烷为原料,在室温条件下反应,利用水解-凝胶法让硅醇以非自发形核的方式在c BN粉体表面聚合。通过对试验结果进行TEM,SEM,EDS,XRD,FTIR表征,结果表明通过对立方氮化硼粉体进行硅氧纳米涂层包核处理,成功得到了立方氮化硼-氧化硅微/纳米核壳结构,包核形貌良好,包覆层厚度可由TEOS加入量的不同而调节。本研究对无机材料核壳结构制备和立方氮化硼与结合剂的均布有实际意义。
In the preparation of cubic boron nitride polycrystalline composite material, in order to improve the segregation of crystal phase, one of the ideas is that the crystal phase and the adhesive phase are prepared in advance into a core-shell structure with raw materials. Hydroxylation of c BN by Pirnaha solution was first used to modify c BN to improve its hydrophilicity and make it easy to disperse and charge. On the basis of stober method, , Using ethanol as dispersant, using TEOS siloxane as raw material and reacting at room temperature, the silanol is polymerized on the surface of cBN powder by non-spontaneous nucleation by the hydrolysis-gel method. The results of TEM, SEM, EDS, XRD and FTIR indicate that the cubic boron nitride-silicon oxide micro / nano-nuclei Shell structure, including nuclear morphology is good, the coating thickness can be adjusted by the amount of different TEOS. This study has practical significance for the preparation of inorganic shell-shell structure and the uniform distribution of cubic boron nitride and binder.