Process for preparation of high pressure apparatus reaction vessel construction

Claim 1

IN A PROCESS FOR THE PEPARATION OF A REACTION VESSEL TO BE INTRODUCED INTO A HIGH PRESSURE, HIGH TEMPERATURE APPARATUS FOR THE CONDUCT OF HIGH PRESSURE, HIGH TEMEPRATURE COMPACTION OF CRYSTALLINE MATERIAL SELECTED FROM THE GROUP CONSISTING OF DIAMOND CUBIC BORON NITRIDE AND MIXTURES THEREOF DURING WHICH PREPARAION SAID CRYSTALLINE MATERIAL TOGETHER WITH CATALYST METAL, TO ENABLE THE CONVERSION OF THE HEXAGONAL FORM 0F SAID CRYSTALLINE MATERIAL TO THE CUBIC FORM THEREOF, ARE PLACED WITHIN A PROTECTIVE METAL ENCLOSURE AND SAID PROTECTIVE METAL ENCLOSURE IN TURN IS ASSEMBLED WITHIN A SERIES OF INTERFITTING INNER AND OUTER ELEMENTS, THE OUTER ELEMENT OF SAID REACTION VESSEL BEING IN THE SHAPED OF A HOLLOW WALL AND BEING MADE FROM ELECTRICALLY NON-CONDUCTIVE, THERMALLY INSULATING MATERIAL MEANS BEING LOCATED ADJACENT SAID OUTER ELEMENT OF CONDUCTING ELECTRICAL CURRENT INTO AND OUT OF SAID REACTION VESSEL FOR HEATING SAME, THE IMPROVEMENT IN SAID PREPARATION COMPRISING, A. FORMING SAID OUTER ELEMENT FROM A DEFORMABLE PRESSURETRANSMITING MATERIAL SELECTED FROM THE GROUP CONSISTING OF SALT AND TALC AND B. ARRANGING A SINGLE MASS OF SAID CRYSTALLINE MATERIAL IN THE FORM OF A VOLUME HAVING A PLURALITY OF MAJOR SURFACES AND A SINGLE CONCENTRATION OF SAID CATALYST METAL WITHIN SAID PROTECTIVE METAL ENCLOSURE, SAID SINGLE CONCENTRATION OF METAL BEING CONTIGUOUS WITH ONLY ONE MAJOR SURFACE OF SAID MASS, WHEREBY DURING THE CONDUCT OF THE COMPACTION PROCESS AT A TEMPERATURE RENDERING MOLTEN SAID CONCENTRATION OF CATALYST METAL, THE COMPACTION FRONT WALL ADVANCE THROUGH SAID MASS OF CRYSTALLINE MATERIAL IN A SINGLE GENERAL DIRECTION DUE TO THE MECHANICAL INSTABILITY OF THE COMPACTION SYSTEM.