CAJ | 학술논문

以钨粉为核芯材料,利用溶胶-凝胶法在其表面包覆二氧化硅壳层;通过硅烷化试剂（APTES）的修饰作用,在酸催化条件下,在钨/二氧化硅表面实施甲醛和尿素的缩聚反应,制备得到具有核-壳结构的钨/二氧化硅/脲醛树脂（W/SiO2/UF）多组分复合材料.通过扫描电子显微镜（SEM）、X-射线衍射（XRD）和傅立叶转变红外（FT-IR）等手段对复合材料的形态、结构和组成等进行了表征.复合材料的导电性测试结果表明,钨粉表面脲醛树脂层包覆后,其电导率由1.7×10-3S/m降低为1.2×10-8 S/m,即钨粉表面包覆层的包覆较为完整、致密,其导电性接近于绝缘材料.
이오분위핵심재료,이용용효-응효법재기표면포복이양화규각층;통과규완화시제（APTES）적수식작용,재산최화조건하,재오/이양화규표면실시갑철화뇨소적축취반응,제비득도구유핵-각결구적오/이양화규/뇨철수지（W/SiO2/UF）다조분복합재료.통과소묘전자현미경（SEM）、X-사선연사（XRD）화부립협전변홍외（FT-IR）등수단대복합재료적형태、결구화조성등진행료표정.복합재료적도전성측시결과표명,오분표면뇨철수지층포복후,기전도솔유1.7×10-3S/m강저위1.2×10-8 S/m,즉오분표면포복층적포복교위완정、치밀,기도전성접근우절연재료.
The SiO2 layer coated on the tungsten powders（W/SiO2） by the sol-gel technique was firstly carried out.After modification of（3-aminopropyl）-triethoxysilane（APTES） onto the W/SiO2 particle surface,W/SiO2/UF multi-component composites with core-shell structures were fabricated via polycondensation between formaldehyde and urea under acidic condition.The morphologies,the structures and the composition of composite materials were characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD）,and Fourier transform infrared spectrometer（FT-IR） techniques.The conductivity of the prepared composite materials significantly decreased from 1.7×10-3 S/m to 1.2×10-8 S/m,after coating of urea-formaldehyde resin layer on the surface of W/SiO2.It was showed that the prepared W/SiO2/UF multi-component composites are of the quite full and dense coating layer,and the conductivity is nearly close to the insulating materials.