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Title: Synthesis and characterization of a remarkable ceramic: Ti{sub 3}SiC{sub 2}

Abstract

Polycrystalline bulk samples of Ti{sub 3}SiC{sub 2} were fabricated by reactively hot-pressing Ti, graphite, and SiC powders at 40 MPa and 1,600 C for 4 h. This compound has remarkable properties. Its compressive strength, measured at room temperature, was 600 MPa, and dropped to 260 MPa at 1,300 C in air. Although the room-temperature failure was brittle, the high-temperature load-displacement curve shows significant plastic behavior. The oxidation is parabolic and at 1,000 and 1,400 C the parabolic rate constants were, respectively, 2 {times} 10{sup {minus}8} and 2 {times} 10{sup {minus}5} kg{sup 2}{center_dot}m{sup {minus}4}{center_dot}s{sup {minus}1}. The activation energy for oxidation is thus {approx}300 kJ/mol. The room-temperature electrical conductivity is 4.5 {times} 10{sup 6} {Omega}{sup {minus}1}{center_dot}m{sup {minus}1}, roughly twice that of pure Ti. The thermal expansion coefficient in the temperature range 25 to 1,000 C, the room-temperature thermal conductivity, and the heat capacity are respectively, 10 {times} 10{sup {minus}6} C{sup {minus}1}, 43 W/(m{center_dot}K), and 588 J/(kg{center_dot}K). With a hardness of 4 GPa and a Young`s modulus of 320 GPa, it is relatively soft, but reasonably stiff. Furthermore, Ti{sub 3}SiC{sub 2} does not appear to be susceptible to thermal shock; quenching from 1,400 C into water does not affect the postquench bend strength.more » As significantly, this compound is as readily machinable as graphite. Scanning electron microscopy of polished and fractured surfaces leaves little doubt as to its layered nature.« less

Authors:
;  [1]
  1. Drexel Univ., Philadelphia, PA (United States). Dept. of Materials Engineering
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
282220
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 79; Journal Issue: 7; Other Information: PBD: Jul 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TITANIUM CARBIDES; SYNTHESIS; HOT PRESSING; MICROSTRUCTURE; MECHANICAL PROPERTIES; PHYSICAL PROPERTIES; SILICON CARBIDES; POWDERS; TITANIUM; CARBON; STOICHIOMETRY; X-RAY DIFFRACTION; SCANNING ELECTRON MICROSCOPY; BULK DENSITY; COMPRESSION STRENGTH; OXIDATION; THERMAL EXPANSION; THERMAL CONDUCTIVITY; SPECIFIC HEAT; HARDNESS; YOUNG MODULUS; THERMAL SHOCK; MACHINING

Citation Formats

Barsoum, M W, and El-Raghy, T. Synthesis and characterization of a remarkable ceramic: Ti{sub 3}SiC{sub 2}. United States: N. p., 1996. Web. doi:10.1111/j.1151-2916.1996.tb08018.x.
Barsoum, M W, & El-Raghy, T. Synthesis and characterization of a remarkable ceramic: Ti{sub 3}SiC{sub 2}. United States. doi:10.1111/j.1151-2916.1996.tb08018.x.
Barsoum, M W, and El-Raghy, T. Mon . "Synthesis and characterization of a remarkable ceramic: Ti{sub 3}SiC{sub 2}". United States. doi:10.1111/j.1151-2916.1996.tb08018.x.
@article{osti_282220,
title = {Synthesis and characterization of a remarkable ceramic: Ti{sub 3}SiC{sub 2}},
author = {Barsoum, M W and El-Raghy, T},
abstractNote = {Polycrystalline bulk samples of Ti{sub 3}SiC{sub 2} were fabricated by reactively hot-pressing Ti, graphite, and SiC powders at 40 MPa and 1,600 C for 4 h. This compound has remarkable properties. Its compressive strength, measured at room temperature, was 600 MPa, and dropped to 260 MPa at 1,300 C in air. Although the room-temperature failure was brittle, the high-temperature load-displacement curve shows significant plastic behavior. The oxidation is parabolic and at 1,000 and 1,400 C the parabolic rate constants were, respectively, 2 {times} 10{sup {minus}8} and 2 {times} 10{sup {minus}5} kg{sup 2}{center_dot}m{sup {minus}4}{center_dot}s{sup {minus}1}. The activation energy for oxidation is thus {approx}300 kJ/mol. The room-temperature electrical conductivity is 4.5 {times} 10{sup 6} {Omega}{sup {minus}1}{center_dot}m{sup {minus}1}, roughly twice that of pure Ti. The thermal expansion coefficient in the temperature range 25 to 1,000 C, the room-temperature thermal conductivity, and the heat capacity are respectively, 10 {times} 10{sup {minus}6} C{sup {minus}1}, 43 W/(m{center_dot}K), and 588 J/(kg{center_dot}K). With a hardness of 4 GPa and a Young`s modulus of 320 GPa, it is relatively soft, but reasonably stiff. Furthermore, Ti{sub 3}SiC{sub 2} does not appear to be susceptible to thermal shock; quenching from 1,400 C into water does not affect the postquench bend strength. As significantly, this compound is as readily machinable as graphite. Scanning electron microscopy of polished and fractured surfaces leaves little doubt as to its layered nature.},
doi = {10.1111/j.1151-2916.1996.tb08018.x},
journal = {Journal of the American Ceramic Society},
number = 7,
volume = 79,
place = {United States},
year = {1996},
month = {7}
}