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Title: Effect of SiC on interfacial reaction and sintering mechanism of TiB{sub 2}

Abstract

Compacts of TiB{sub 2} with densities approaching 100% are difficult to obtain using pressureless sintering. The addition of SiC was very effective in improving the sinterability of TiB{sub 2}. The oxygen content of the raw TiB{sub 2} powder used in this research was 1.5 wt%. X-ray photoelectron spectroscopy showed that the powder surface consisted mainly of TiO{sub 2} and B{sub 2}O{sub 3}. Using vacuum sintering at 1,700 C under 13--0.013 Pa, TiB{sub 2} samples containing 2.5 wt% SiC achieved 96% of their theoretical density, and a density of 99% was achieved by HIPing. TEM observations revealed that SiC reacts to form an amorphous phase. TEM-EELS analysis indicated that the amorphous phase includes Si, O, and Ti, and X-ray diffraction showed the reaction to be TiO{sub 2} + SiC {yields} SiO{sub 2} + TiC. Therefore, the improved sinterability of TiB{sub 2} resulted from the SiO{sub 2} liquid phase that was formed during sintering when the raw TiB{sub 2} powder had 1.5 wt% oxygen.

Authors:
 [1]; ;  [2];  [1]
  1. Univ. of Tokyo (Japan). Research Center for Advanced Science and Technology
  2. NKK Corp., Kawasaki (Japan)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
82629
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 78; Journal Issue: 6; Other Information: PBD: Jun 1995
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MATERIALS; SINTERING; MICROSTRUCTURE; TITANIUM BORIDES; SILICON CARBIDES; INTERFACES; CHEMICAL REACTIONS; TITANIUM OXIDES; SILICON OXIDES; X-RAY SPECTROSCOPY; BULK DENSITY; TRANSMISSION ELECTRON MICROSCOPY; SCANNING ELECTRON MICROSCOPY; X-RAY DIFFRACTION; CHEMICAL COMPOSITION

Citation Formats

Torizuka, Shiro, NKK Corp., Kawasaki, Sato, Kaoru, Nishio, Hiroaki, and Kishi, Teruo. Effect of SiC on interfacial reaction and sintering mechanism of TiB{sub 2}. United States: N. p., 1995. Web. doi:10.1111/j.1151-2916.1995.tb08858.x.
Torizuka, Shiro, NKK Corp., Kawasaki, Sato, Kaoru, Nishio, Hiroaki, & Kishi, Teruo. Effect of SiC on interfacial reaction and sintering mechanism of TiB{sub 2}. United States. https://doi.org/10.1111/j.1151-2916.1995.tb08858.x
Torizuka, Shiro, NKK Corp., Kawasaki, Sato, Kaoru, Nishio, Hiroaki, and Kishi, Teruo. 1995. "Effect of SiC on interfacial reaction and sintering mechanism of TiB{sub 2}". United States. https://doi.org/10.1111/j.1151-2916.1995.tb08858.x.
@article{osti_82629,
title = {Effect of SiC on interfacial reaction and sintering mechanism of TiB{sub 2}},
author = {Torizuka, Shiro and NKK Corp., Kawasaki and Sato, Kaoru and Nishio, Hiroaki and Kishi, Teruo},
abstractNote = {Compacts of TiB{sub 2} with densities approaching 100% are difficult to obtain using pressureless sintering. The addition of SiC was very effective in improving the sinterability of TiB{sub 2}. The oxygen content of the raw TiB{sub 2} powder used in this research was 1.5 wt%. X-ray photoelectron spectroscopy showed that the powder surface consisted mainly of TiO{sub 2} and B{sub 2}O{sub 3}. Using vacuum sintering at 1,700 C under 13--0.013 Pa, TiB{sub 2} samples containing 2.5 wt% SiC achieved 96% of their theoretical density, and a density of 99% was achieved by HIPing. TEM observations revealed that SiC reacts to form an amorphous phase. TEM-EELS analysis indicated that the amorphous phase includes Si, O, and Ti, and X-ray diffraction showed the reaction to be TiO{sub 2} + SiC {yields} SiO{sub 2} + TiC. Therefore, the improved sinterability of TiB{sub 2} resulted from the SiO{sub 2} liquid phase that was formed during sintering when the raw TiB{sub 2} powder had 1.5 wt% oxygen.},
doi = {10.1111/j.1151-2916.1995.tb08858.x},
url = {https://www.osti.gov/biblio/82629}, journal = {Journal of the American Ceramic Society},
number = 6,
volume = 78,
place = {United States},
year = {1995},
month = {6}
}