立方氮化硼表面Stober法包覆硅氧纳米涂层及其表征

发布时间：2018-06-21 18:21

本文选题：立方氮化硼 + 核壳结构　；参考：《中国表面工程》2017年04期

【摘要】：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cBN进行羟基化改性,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,并对试验结果进行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。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。
[Abstract]:In the preparation of cubic boron nitride (CBN) polycrystalline composites, in order to improve the segregation of crystal phase, one of the ideas is to pre-prepare the crystalline phase and the adhesive phase into the material with core-shell structure. Firstly, the hydroxy of CBN was modified by Pirnaha solution to improve its hydrophilicity so that it could be easily dispersed and charged. Then the silica and oxygen coating was carried out by Stober method. Ethanol was used as dispersant under the action of ammonia water and a small amount of water. Using TEOS siloxane as raw material, the surface of c-BN powder was polymerized by hydrolysis-gel method in a non-spontaneous nucleation manner. The experimental results were characterized by TEMSEMN EDS-XRDX FTIR. The results show that the cubic boron nitride / silicon oxide microcore-shell structure is successfully obtained by the nucleation treatment of cubic boron nitride powder with silica nano-coating. The morphology of the inclusion core is good and the thickness of the coating can be adjusted by the addition of TEOS. It is of practical significance for the preparation of core-shell structure of inorganic materials and the homogenization of cubic boron nitride and binder.
【作者单位】：桂林理工大学有色金属及材料加工新技术教育部重点实验室;
【基金】：国家自然科学基金(51262004)~~
【分类号】：TB306

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