Method for producing whiskers

Abstract

Abstract 1. A METHOD OF GROWIN CARBIDE WHISKERS OF SILICON AND OF BORON COMPRISING THE STEPS OF PREPARING AN INTERDISPERSION OF MATERISLS REACTABLE TO FORM CARBIDE WHISKERS IN TH PRESENCE OF A SUITABLE CATALYST, ALL MATERIALS INCLUDING CATALYST BEING IN THE FORM OF GRANULES RANGING IN SIZE FROM 1/200U TO 5U, SAID INTERDISPERSION INCLUDING CARBON IN THE FORM OF A MEMBER OF THE GROUP CONSISTING OF GRAPHITE, CARBON BLACK, CHARCOAL AND A CARBOHYDRATE THERMALLY DECOMPOSABLE TO CARBON AT SUFFICIENTLY HIGH TEMPERATURE, SAID CATALYST BEING SELECTED FROM THE GROUP CONSISTING OF NI AND COMPOUNDS THEREOF REDUCIBLE TO NI WHEN EXPOSED OF H2 AT HIGH TEMPERATURE WHEN BORON CARBIDE IS TO BE FORMED, AND SAID CATALYST BEING SELECTED FROSM THE GROUP CONSISTING OF NI, PD, CO AND FE COMPOUND REDUCIBLE TO NI, PD, CO, OR FE IN THE PRESENCE OF H2 AT HIGH TEMPERATURE, WO3 AND MIO2, WHEN SILICON CARBIDE IS TO BE FORMED, SAID CATALYST FOR PREPARING WHISKERS OF EITHER BORON OR SILICON CARBIDE BEING PRESENT IN QUANTITY FROM 1X10**-3 TO 2 ATOMIC PERCENT, AND AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF SI AND B OF WHICH A CARBIDE IS TO BE FORMED, SAID ELEMENT BEING PRESENT IN BOTH THE ELEMENTARY AND AN OXIDE FORM, AND EXPOSING SAID INTERDISPERSION TO HYDROGEN AT ELEVATED TEMPERATURE FOR A PEROD OF TIME SUFFICIENT TO ACHIEVE THE DESIRED GROWTH. D R A W I N G

Inventors

• 👤 C Tomita
• 👤 S Koizumi

Bibliographic Details