鸟喙复合结构莫来石的制备及其力学性能  

Preparation and Mechanical Properties of Bird’s Beak Composite Structure Mullite

作　　者：张瑜 桑可正[1] 曾德军[1] 刘朵 ZHANG Yu;SANG Kezheng;ZENG Dejun;LIU Duo(School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China)

机构地区：[1]长安大学材料科学与工程学院,西安710064

出　　处：《硅酸盐通报》2020年第6期1930-1935,共6页Bulletin of the Chinese Ceramic Society

基　　金：陕西省自然科学基金研究计划(2018JQ5120)。

摘　　要：通过在多孔莫来石晶须框架表层喷涂渗入莫来石溶胶后烧结的方法制备鸟喙复合结构莫来石材料。结果表明,莫来石溶胶由于自身粘性在多孔晶须框架表面层内积累,经不同次数的喷涂并干燥后,1500℃烧结,可得到具有不同表面致密层厚度的框架复合结构。当喷涂次数从5次增加到15次时,表面致密层的厚度从10μm增加到150μm,复合结构的气孔率由65.2%下降到57.8%;与此同时,试样的抗弯强度从36 MPa逐渐增加到了62 MPa;抗压强度也由51 MPa增加到89 MPa。除去整体气孔率下降对试样强度的影响,强度的额外增加,源于所形成的复合结构。A bird’s beak composite structure mullite material was prepared by spraying a mullite sol on the surface of a porous mullite whisker frame and then sintering.The results show that the mullite sol is infiltrated into the frame and accumulated in the surface layer due to its own viscosity.After drying and sintering at 1500℃,the composite structure mullite with different thickness of dense surface layer by spraying different times can be obtained.When the spraying times increase from 5 to 15,the thickness of the surface dense layer increases from 10μm to 150μm,and the porosity of the composite structure decreases from 65.2%to 57.8%.Meanwhile,the flexural strength of the sample gradually increases from 36 MPa to 62 MPa,and the compressive strength also increases from 51 MPa to 89 MPa.Excluding the effect of the decrease of overall porosity on the strength of the sample,the additional increase in strength results from the composite structure formed.

关 键 词：鸟喙结构 多孔莫来石 增强作用 

分 类 号：TB332[一般工业技术—材料科学与工程]