Transverse strength improvement of composites

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6814700

Cheung, A T

Tensile tests of SiC monofilament reinforced composites showed transverse strengths less than 4000 psi (28 MPa). Low strength was due mainly to poor SiC to Al matrix bonding. One solution was to make hybrid composites utilizing a different and smaller type of fibers to reinforce the transverse direction without adversely affecting axial strength. The reinforcing fibers used were the continuous Nicalon (SiC) and Fiber FP (Al/sub 2/O/sub 3/) multifilaments and the Silag whiskers (SiC). Measurements established that the Silag whiskers provided effective reinforcement resulting in ultimate tensile stresses up to 50,000 psi (345 MPa). Fracture and microstructural analysis of Silag composites and hybrids showed many features such as low fiber pullout population and the presence of three types of brittle particulates, which if eliminated could have raised strengths substantially.

• Research Organization: Virginia Univ., Charlottesville (USA)
• OSTI ID: 6814700
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALUMINIUM
BONDING
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
ELEMENTS
FABRICATION
FILAMENTS
FRACTURE PROPERTIES
JOINING
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
SILICON CARBIDES
SILICON COMPOUNDS
TENSILE PROPERTIES