摘要:
A substrate made of polycrystalline βSiC and having an essentially pore free surface is disclosed. The substrate is adapted for use as a wafer component to support different thinfilms as part of manufacturing for discrete or integrated circuit electronic devices. The substrate comprises a polycrystalline silicon carbide outer surface with {111} crystal planes exposed on the working surface, the outer surface is essentially pore free or without exposed pores, scratches, steps or other such depressions or discontinuities on the surface of the substrate having at least one dimension larger than 2.54 microns, and no non-stoichiometric silicon or carbon other than that which may be residual from the process of making silicon carbide ceramic material.
摘要:
A substrate made of polycrystalline βSiC and having an essentially pore free surface is disclosed. The substrate is adapted for use as a wafer component to support different thinfilms as part of manufacturing for discrete or integrated circuit electronic devices. The substrate comprises a polycrystalline silicon carbide outer surface with {111} crystal planes exposed on the working surface, the outer surface is essentially pore free or without exposed pores, scratches, steps or other such depressions or discontinuities on the surface of the substrate having at least one dimension larger than 2.54 microns, and no non-stoichiometric silicon or carbon other than that which may be residual from the process of making silicon carbide ceramic material.
摘要:
A process for the production of high-performance ceramics and ceramic precursors is disclosed which comprises reacting an organometallic precursor with a reactant in a supercritical fluid and exposing the organometallic product to a ceramic material. A critical temperature (or pressure) is required to produce the supercritical fluid which is the maximum temperature (or pressure) at which a gas or vapor may be liquified by the application of a critical pressure (or temperature). Nitrogen-containing ceramics such as nitrides, oxynitrides and carbonnitrides, and carbide ceramics are produced by reacting precursors such as alkyl halosilanes and dialkyl silanes in the presence of a supercritical fluid such as nitrogen, hydrogen, ammonia and mixtures thereof for the nitrogen-containing ceramics and in the presence of hydrocarbons, hydrogen or mixtures thereof for the carbide ceramics. The high performance ceramics produced find particular application in the automobile industry.
摘要:
A process for the production of high-performance ceramics and ceramic precursors is disclosed which comprises reacting an organometallic precursor with a reactant in a supercritical fluid and exposing the organometallic product to a ceramic material. A critical temperature (or pressure) is required to produce the supercritical fluid which is the maximum temperature (or pressure) at which a gas or vapor may be liquified by the application of a critical pressure (or temperature). Nitrogen-containing ceramics such as nitrides, oxynitrides and carbonnitrides, and carbide ceramics are produced by reacting precursors such as alkyl halosilanes and dialkyl silanes in the presence of a supercritical fluid such as nitrogen, hydrogen, ammonia and mixtures thereof for the nitrogen-containing ceramics and in the presence of hydrocarbons, hydrogen or mixtures thereof for the carbide ceramics. The high performance ceramics produced find particular application in the automobile industry.