Title

Growth And Mechanical Properties Of Filamentary Silicon Carbide Crystals

Date

1961

Photo Quality

Complete

Report Number

WADD TR 61-252

Creator

Yerkovtich, Luke A.

Kirchner, Henry P.

Corporate Author

Cornell Aeronautical Laboratory, Inc.

Laboratory

Nonmetallic Materials Laboratory

Extent

38

Identifier

AD0273997

AD0273997

Access Rights

ASTIA

Distribution Classification

1

Contract

AF 33(616)-7005

DoD Project

7340

DoD Task

73400

DTIC Record Exists

Yes

Distribution Change Authority Correspondence

None

Report Availability

Full text available

Date Issued

1961-08

Abstract

In this investigation silicon carbide whiskers were grown under various experimental conditions. The strength and modulus of elasticity of several whiskers were determined at room temperature. Methods of heating the whiskers for high temperature measurements were investigated. The specific gravity of the whiskers was inferred from measurement of the unit cell dimensions by X-ray diffraction patterns. Silicon carbide whiskers were grown by pyrolysis of methyltrichlorosilane in hydrogen. In some cases dense growths of whiskers from 1.2 to 1.5 centimeters in length and from 2 to 5 microns in diameter were observed. The longest whisker obtained, thus far, was 5 centimeters in length. The tensile strength ranged from 100,400 to 1,650,000 psi. The elastic strain at failure varied from 0.41 to 1.10 per cent and the observed values of elastic modulus varied from 12,700,000 to 123,300,000 psi. These results indicate that silicon carbide whiskers can be strong, high modulus of elasticity materials. Much research needs to be done to improve the methods of measurement, and to define the conditions of measurement and the types of whiskers that will give the best performance as structural materials.

Publisher

Wright-Patterson Air Force Base: Directorate of Materials and Processes, Aeronautical Systems Division, Air Force Systems Command

Distribution Conflict

No

Index Abstract

Contrails and DTIC

Provenance

Lockheed Martin Missiles & Fire Control

Type

report

Subject

Physical Properties

Pyrolysis

Single Crystals

Carbides

Silicon Compounds

Methyl Radicals

Tensile Properties

Elastic Properties

X Ray Diffraction

Test Methods

Test Equipment

Silanes

Chlorides

Determination

Production

Growth (Physiology)

Density

Mechanical Properties

Format

1 online resource