Pressureless sintering and microstructural development of B sub 4 C-TiB sub 2 composites

Journal Article · Fri Jan 01 00:00:00 EST 1988 · Advanced Ceramic Materials; (USA)

DOI:https://doi.org/10.1111/j.1551-2916.1988.tb00169.x· OSTI ID:5943129

Kim, Do Kyung; Kim, Chong Hee ^[1]

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1. Korea Advanced Institute of Science and Technology, Seoul (Korea)

Densities >95% of theoretical were achieved by pressureless sintering of B{sub 4}C-TiB{sub 2} composites (with up to 50 wt% TiB{sub 2}) at 2,150{degree} to 2,175{degree}C using 1 wt% Fe as a sintering aid. Iron levels between 0 and 5 wt% were examined; densities >97% of theoretical were obtained with 1 wt% Fe for a B{sub 4}C-10 wt% TiB{sub 2} composite. Excessive grain growth was observed when excess liquid was present (i.e., high Fe additions), resulting in decreased flexural strength. The effects of the additives on the sintering behavior and microstructural alterations were examined. Microstructural investigations were conducted using optical and electron microscopy. Microstructures consisted of fine-grained B{sub 4}C and intergranular TiB{sub 2} (both phases generally {approx}5 {mu}m in diameter). Transmission electron microscopy revealed that the iron-rich grain-boundary phase(s) existed, both at B{sub 4}C/B{sub 4}C interfaces and at B{sub 4}C/TiB{sub 2} interfaces.

• OSTI ID: 5943129
• Journal Information: Advanced Ceramic Materials; (USA), Vol. 3:1, Issue 1; ISSN 0883-5551
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON CARBIDES
MICROSTRUCTURE
SINTERING
TITANIUM BORIDES
COMPOSITE MATERIALS
EXPERIMENTAL DATA
GRAIN GROWTH
MEASURING METHODS
VERY HIGH TEMPERATURE
BORIDES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CRYSTAL STRUCTURE
DATA
FABRICATION
INFORMATION
MATERIALS
NUMERICAL DATA
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies