Paper Title:
Influence of Nitride on Sinterability of the Composite of Lithium Aluminum Silicate and Silicon Carbide
  Abstract

Ceramics with zero thermal expansion coefficients at room temperature (293K) were investigated. We found the thermal expansion coefficient was controlled by a compounding ratio of lithium aluminum silicate (LAS) and silicon carbide (SiC), which have negative and positive thermal expansion coefficients respectively. Although it was difficult to densify the composite of the LAS and SiC (LAS/SiC) in the sintering process, an addition of nitride improved the sinterability of the LAS/SiC. In order to examine the effect of the nitride additive, at first, the melting point of the LAS with silicon nitride (Si3N4) or aluminum nitride was measured by TG-DTA. The melting point of the LAS decreased with existence of nitride. It is believed that the densification of the LAS/SiC was promoted by the nitride, because the nitride causes the LAS/SiC to form a liquid phase, thereby decreasing the melting point. Next, the lattice constant of the LAS with Si3N4 was measured by XRD and it was verified that the a-axis was longer and the c-axis was shorter than those of the LAS without additive. It is supposed that this phenomenon is due to the substitution of nitrogen for oxygen in the LAS lattice, and the decrease of the melting point of the LAS with nitride seems to be influenced by this substitution of nitrogen.

  Info
Periodical
Key Engineering Materials (Volumes 317-318)
Edited by
T. Ohji, T. Sekino and K. Niihara
Pages
177-180
DOI
10.4028/www.scientific.net/KEM.317-318.177
Citation
M. Iguchi, M. Umezu, M. Kataoka, H. Nakamura, M. Ishii, "Influence of Nitride on Sinterability of the Composite of Lithium Aluminum Silicate and Silicon Carbide", Key Engineering Materials, Vols. 317-318, pp. 177-180, 2006
Online since
August 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Y.M. Zhu, Xia Wan Wu, Zhi Hong Li
Abstract:In order to reduce the raw materials cost, lower the sintering temperature of 3Y-TZP optical fiber ferrules, the 3Y-TZP/ LAS glass ceramics...
995
Authors: Yong Li, Xiao Li Zhang, Ling Li, Hong Sheng Wang, Hong Yi Jiang
Abstract:In this research, different amounts of LaCl3 were added to the lithium aluminum silicate (LAS) ceramics and the sample powder was prepared by...
112
Authors: Huan Xia Zhu, Ke Zhi Li, Jin Hua Lu, He Jun Li
Abstract:The SiC coating on C/C composites was prepared by CVD and pack-cementation method in this paper, then SiC coated C/C composites was jointed...
24