General Electric Company

Momentive Performance Materials Gmbh

Robert Vincent Leonelli, Jr

Mark Philip D'Evelyn

Robert Arthur Giddings

Kristi Jean Narang

Steven Alfred Tysoe

Suresh Shankarappa Vagarali

John William Lucek

Joel Rice Dysart

Peter S Allison

A capsule for containing at least one reactant and a supercritical fluid in a substantially air-free environment under high pressure, high temperature processing conditions. The capsule includes a closed end, at least one wall adjoining the closed end and extending from the closed end; and a sealed end adjoining the at least one wall opposite the closed end. The at least one wall, closed end, and sealed end define a chamber therein for containing the reactant and a solvent that becomes a supercritical fluid at high temperatures and high pressures. The capsule is formed from a deformable material and is fluid impermeable and chemically inert with respect to the reactant and the supercritical fluid under processing conditions, which are generally above 5 kbar and 550&#xb0; C. and, preferably, at pressures between 5 kbar and 80 kbar and temperatures between 550 &#xb0; C. and about 1500&#xb0; C. The invention also includes methods of filling the capsule with the solvent and sealing the capsule, as well as an apparatus for sealing the capsule.

High temperature high pressure capsule for processing materials in supercritical fluids

A capsule for containing at least one reactant and a supercritical fluid in a substantially air-free environment under high pressure, high temperature processing conditions. The capsule includes a closed end, at least one wall adjoining the closed end and extending from the closed end; and a sealed end adjoining the at least one wall opposite the closed end. The at least one wall, closed end, and sealed end define a chamber therein for containing the reactant and a solvent that becomes a supercritical fluid at high temperatures and high pressures. The capsule is formed from a deformable material and is fluid impermeable and chemically inert with respect to the reactant and the supercritical fluid under processing conditions, which are generally above 5 kbar and 550&#xb0; C. and, preferably, at pressures between 5 kbar and 80 kbar and temperatures between 550&#xb0; C. and about 1500&#xb0; C. The invention also includes methods of filling the capsule with the solvent and sealing the capsule, as well as an apparatus for sealing the capsule.

A high temperature/high pressure (HP/HT) apparatus for converting feedstock housed in a capsule into product crystals, comprising at least two electrical heating paths for independent control of both the mean temperature in the reaction cell and the temperature gradient across the reaction cell.

High pressure/high temperature apparatus with improved temperature control for crystal growth

A belt/die, pre-tensioned loaded windings, or other high-pressure apparatus has a series of annular rings for confining material being subjected to high-pressure treatment. The series of annular rings has an inner annular ring having an inner upper edge, an outer upper edge, an inner lower edge, and an outer lower edge. The inner lower edge is chamfered at an angle of greater than about 60&deg; from the vertical in order to create a transition slope that mitigates tensile stresses.

Growing community of inventors

Westerville, OH, United States of America

Robert Vincent Leonelli, Jr