Silicon carbide films are grown by carburization of silicon to form insulative films. In one embodiment, the film is used to provide a gate insulator for a field effect transistor. The film is grown in a microwave-plasma-enhanced chemical vapor deposition (MPECVD) system. A silicon substrate is first etched in dilute HF solution and rinsed. The substrate is then placed in a reactor chamber of the MPECVD system in hydrogen along with a carbon containing gas. The substrate is then inserted into a ...

A case-hardened, corrosion-resistant steel article is provided which comprises, applying a coating of nickel and/or cobalt to the surface of the article and then subjecting said coated article to carburization by heating said coated article to and maintaining it at an austenitic temperature under carburizing conditions for a time sufficient to effect carbon diffusion into the surface of the steel article. The corrosion resistance of the steel may be further enhanced by applying a thin layer of a...

An apparatus for measuring a carburized portion occurring in inside of a tubular article, the apparatus comprising a first detecting unit having opposite magnetic poles of a first magnet arranged in parallel to an inspecting face of a case made of nonmagnetic material and a magnetism detector disposed at an intermediate portion between the poles, a second detecting unit having opposite magnetic poles of a second magnet arranged perpendicular to the inspecting face of the case and a magnetism det...

Process for manufacturing a mechanical component made of steel, in which a blank of the steel component is manufactured and a high-temperature carburizing or carbonitriding treatment of at least part of the surface of the blank of the component is carried out, the chemical composition of the steel of which the component is composed comprises, by weight: 0.15%.ltoreq.C.ltoreq.0.35%; 0%.ltoreq.Si.ltoreq.0.6%; 0%.ltoreq.Mn+Cr+Ni+Mo.ltoreq.5%; 0%.ltoreq.Al.ltoreq.0.1%; 0%.ltoreq.Cu.ltoreq.0.5%; 0%.l...

A roller member comprising high carbon chromium bearing steel having a carburization treatment. The bearing steel comprising a surface portion defined as a range between a surface of a rolling face of the roller member to a depth where a maximum shearing stress acts thereon, the surface portion containing carbon in a total amount comprising a range of 1.0 to 1.6 wt % and an amount of residual austenite comprising a range of 20 vol % to 35 vol % wherein a compression residual stress of the surfac...

A case hardening steel which consists essentially of 0.03-0.2 wt % of C, 1.0-3.0 wt % of Si, 0.2-2.0 wt % of Mn, 0.05-0.5 wt % of V and the balance of Fe. The primary advantage of this steel is fineness of grain size after carburizing at relatively high temperatures. Even when carburizeed at or above 950.degree. C., the grain size number is not smaller than 6 in both the hardened case and the core. Optionally the steel may contain up to 2.0 wt % of Ni, up to 2.0 wt % of Cr and/or up to 0.5 wt % ...

A composite gear made up of a carburized gear ring and separately formed hub and a method of making same wherein distortions in the gear teeth and ring caused by the carburizing process are removed by a special design of hub and welding selected portions of the hub to the ring.

A steel composition and method of processing have been developed that provide good grain coarsening resistance and optimum toughness after austenitizing at high temperatures for extended periods of time. The composition comprises, in % by weight, about: 0.10-0.40% C, 0.018-0.064% Nb, 0.024-0.066% Al, and 80-220 ppm N, the balance being Fe and other alloying elements found in common carburizing grades of steel. The steel is particularly suited to improving the core toughness of case-carburized co...

An alloy solute sensor probe, measurement system and measurement method are disclosed for directly measuring solute concentration profiles in conductive material components at elevated processing temperatures. The disclosed device and method permit direct, real-time non-destructive measurement of solute concentration profiles in treated surfaces in alloy components. In disclosed embodiments, a novel concentric carbon sensor and rod-shaped carbon sensor are disclosed which employ AC frequencies f...

The preferred embodiments are directed toward methods and apparatus for manufacturing components for earth-boring drill bits. In the preferred embodiments, a portion of the component is coated and the component is exposed to a carbon-rich environment at an elevated temperature. During this exposure, some portions of the component are not coated. The preferred embodiments further comprise coating the areas that were exposed to the carbon-rich environment and exposing the component to an elevated ...