Porous Reaction-Bonded Silicon Nitride Ceramics: Fabrication Using Hollow Polymer Microspheres and Properties

被引：11

作者：

Georgiu, N. K. ^{[1
]}

Georgiu, I. F. ^{[1
]}

Klemazov, K. V. ^{[1
]}

Lisachenko, M. G. ^{[1
]}

Zabezhailov, A. O. ^{[1
]}

Rusin, M. Yu. ^{[1
]}

机构：

[1] JSC Romashin Tekhnol Res & Prod Enterprise, Kievskoe Sh 15, Obninsk 249030, Kaluga Oblast, Russia

来源：

INORGANIC MATERIALS | 2019年 / 55卷 / 12期

关键词：

reaction-bonded silicon nitride; porous ceramics; structural ceramics; pore former; THERMAL-CONDUCTIVITY; MICROSTRUCTURE; STRENGTH;

D O I：

10.1134/S0020168519120057

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A process has been proposed for the preparation of porous reaction-bonded silicon nitride (RBSN) via the addition of a pore former, uniaxial pressing, and subsequent reaction sintering in a vacuum furnace. As a pore former, we used a commercially available powder consisting of hollow polymer microspheres (Akzonobel) with an average diameter of 9 mu m. We have studied the effect of pore former content in green compacts on the mechanical, dielectric, and thermophysical properties of the ceramics. The proposed process allows one to prepare porous RBSN with the following properties: sigma(b) = 48 MPa, epsilon = 3.2, tan delta = 35 x 10(-4) at a frequency of 10 GHz, and lambda = 0.96 W/(m K) at 1100 degrees C. The ceramic obtained in this study is potentially attractive for industrial application as a radar-transparent structural material with reduced thermal conductivity.

引用

页码：1290 / 1296

页数：7

共 26 条

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Andrievskii R.A., 1984, Silicon Nitride and Related Materials

[2]

Antsiferov V.N., 1988, OGNEUPORY, P20

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