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Synthesis of TiB 2 from a carbon‐coated precursors method

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.14794· OSTI ID:1401292
 [1];  [2]
  1. Department of Mechanical Engineering and Energy Processes Southern Illinois University Carbondale Illinois, Department of Materials Science and Engineering University of Maryland Energy Research Center University of Maryland College Park College Park, Maryland 20742
  2. Department of Mechanical Engineering and Energy Processes Southern Illinois University Carbondale Illinois
Abstract

This article deals with the synthesis of TiB 2 from carbon‐coated TiO 2 precursors with the addition of B 4 C. The carbon‐coated precursors method alters the reaction process, compared with the conventional mixing of reactants, to produce high‐quality TiB 2 powders. The produced powders have a single phase, a submicron particle size (~0.3 to 0.8 μm), regular shape, loose agglomeration, and low level of contaminations (less than 0.5 wt% carbon and 0.6 wt% oxygen). The formation mechanism proposed is based on experimental results and thermodynamic evaluations. For comparison, the powders obtained from the mixture of reactants show higher agglomeration, a large particle size (>1 μm), high level of contaminations (0.7 wt% carbon and 1.1 wt% oxygen), and difficulty to control the reaction process (formation of Ti BO 3 and Ti 2 O 3 as the intermediate phases). The synthesized powders from the precursors method can be hot pressed to a relative density of ~94.5% with the formation of platelike grains at 1800°C under a pressure of 35 MPa without additives.

Sponsoring Organization:
USDOE
Grant/Contract Number:
FE0008864
OSTI ID:
1401292
Alternate ID(s):
OSTI ID: 1536751
Journal Information:
Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 6 Vol. 100; ISSN 0002-7820
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English

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