摘要:
By supplying gaseous nitrogen throughout a discrete aliquot of a preferably pelletized mixture of aluminum oxide, carbon and, optionally, calcium oxide during the carbothermal reduction thereof to aluminum nitride and continuously removing gaseous reaction products therefrom, a high quality aluminum nitride is produced. One means of supplying gaseous nitrogen to the mixture of solid reactants is a perforated tray having a hollowed-out bottom. Gaseous nitrogen supplied to the hollowed-out portion flows through the perforations and throughout solid reactants contained in the tray. The carbon may be alternatively supplied, in whole or in part, as a gaseous reactant.
摘要:
A microwave-sensitive thermoplastic composition that includes a microwave-receptive additive; and a thermoplastic polymer; wherein the microwave-receptive additive is selected from the group consisting of sepiolite clay, molecular sieves formed from ammonium ion salts or hydrogen ion salts, aluminophosphates, silicoaluminophasphates, silicotitanates, organo-modified clays, molecular sieves or zeolites having a caged organic microwave receptive material, and combinations thereof.
摘要:
A process for preparing oxidized graphite that provides exfoliated graphene, preferably with high surface area. The process uses considerably less chlorate than previously known systems.
摘要:
The present invention relates to a nitrate salt-based process for preparing a graphite oxide. The invention nitrate salt-based process employs starting materials comprising a sulfuric acid, an inorganic nitrate salt, an amount of water, a first amount of chlorate salt, and a graphite.
摘要:
The polymer composition is a flame retardant composition comprising an organic polymer and nanographene. Suitable organic polymers include polymers such as polyolefins and polyvinyl chloride. Preferably, the nanographene should have an aspect ratio greater than equal to about 1000:1, should have a surface area greater than or equal to about 100 m2/gram nitrogen surface absorption area, and be expanded.
摘要:
A process for preparing oxidized graphite that provides exfoliated graphene, preferably with high surface area. The process uses considerably less chlorate than previously known systems.
摘要:
A method of formulating a microwave-heatable thermoplastic composition designed to have a selected heating rate. The method may include: selecting at least one of a microwave receptive additive, a microwave receptive additive particle size, and a concentration of the microwave receptive additive; selecting at least two inputs selected from the group consisting of a thermoplastic polymer composition, a microwave power, an electric field strength, a maximum allowable temperature of the thermoplastic polymer composition, a processing temperature of the thermoplastic polymer composition, and a thermal diffusivity of the thermoplastic polymer composition; and mixing a microwave receptive additive with a thermoplastic polymer to form the microwave-heatable thermoplastic composition having a selected heating rate based on the selecting at least one and the selecting at least two.
摘要:
A method is disclosed for purifying aluminum nitride produced by carbothermal reaction of aluminum oxide, carbon and nitrogen. Precursor pellets including aluminum oxide and carbon are exposed to nitrogen under conditions sufficient to carbothermally produce aluminum oxide, thereby producing aluminum nitride pellets having surface portions relatively rich in thermal conductivity-lowering and color-causing impurities compared to core portions of the aluminum nitride pellets. Significant amounts of the surface portions are thereafter removed to thereby significantly increase the purity of the aluminum nitride pellets.
摘要:
An article and method for its perparation is disclosed wherein the article comprises a substrate having at least one planar surface on which is disposed a thermally decomposable metallo-organic compound in active association with a photosensitive dye. The article can be easily processed with, for example, a source of energy such as a laser beam to encode information or produce electroconductive lines.