碳热还原-反应烧结法制备多孔氮化硅陶瓷  

Fabrication of Porous Silicon Nitride with High Porosity by Carbothermal Reduction-reaction Bonding

作　　者：鲁元[1,2] 杨建锋[3] 李京龙[1,2] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072 [2]西北工业大学陕西省摩擦焊接重点实验室,西安710072 [3]西安交通大学金属材料强度国家重点实验室,西安710049

出　　处：《无机材料学报》2013年第5期469-473,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(50772086;50821140308);国家863项目(2007AA03Z558)~~

摘　　要：以廉价的二氧化硅、炭黑和硅粉为起始原料,利用碳热还原–反应烧结法制备了高气孔率、孔结构均匀的多孔氮化硅陶瓷,考察了原料中硅粉含量对多孔氮化硅陶瓷微观组织和力学性能的影响。XRD分析表明烧结后的试样成分除了少量的-Si3N4相和晶间相Y2Si3O3N4外,其余都是β-Si3N4相;SEM分析显示微观组织由棒状β-Si3N4晶粒和均匀的孔组成。通过改变硅粉的含量,制备了不同气孔率,力学性能优异的多孔氮化硅陶瓷。By using cheaper Si, SiO2 and carbon black as starting material, the porous silicon nitride ceramics with high porosity and uniform pore structure were prepared by carbothermal reduction-reaction bonding method. The influences of Si content on the microstructure and mechanical properties of the samples were investigated. Microstructures and mechanical properties of porous silicon nitride ceramics were studied by XRD, SEM and three-point bending measurement. XRD analysis showed that only ^-Si3N4 phase, minor of （x-Si3N4 phase and glass phase Y3Si303N4 were detected in the samples. SEM analysis showed that porous silicon nitride ceramics obtained were composed of rod-like ^-Si3N4 grains and uniform pores. Porous silicon nitride ceramics with different porosities and good mechanical properties were fabricated by changing the Si content.

关 键 词：碳热还原-反应烧结法 多孔氮化硅陶瓷 气孔率 

分 类 号：TQ171[化学工程—玻璃工业]