Gm Global Technolgoy Operations, Inc.

City University of Hong Kong

Simon Chin-Yu Tung

Anil Kumar Sachdev

Xingcheng Xiao

Gregory Mordukhovich

Yucong Wang

Shekhar G Wakade

Jie Gu

Peter Vernia

Tai L Chan

Gary C Barber

Yiu-Wing Mai

Lawrence Kwok-Yan Li

Jean M Dasch

Yaogen Shen

A method of making at least one nanographene layer is disclosed herein. The method includes selecting X hydrocarbon precursor and Y hydrogen gas (H) such that a ratio of X/Y ranges from 0.5 to 1, the hydrocarbon precursor including at least one of CH, CHor CH. The method further includes submitting the hydrocarbon precursor to chemical vapor deposition using the hydrogen gas and argon gas (Ar). As a result, i) the hydrocarbon precursor reacts with the hydrogen gas and argon gas (Ar) according to the following reaction:X hydrocarbon precursor+YH+ZAr&#x2192;2X graphene+(Y+2X)H+ZAr,where Z ranges from 5*(X+Y) to 10*(X+Y), and ii) the hydrocarbon precursor decomposes and self-assembles to form the at least one nanographene layer.

Nanographene layers and particles and lubricants incorporating the same

A materials combination for a camshaft and follower of an engine valve train provides excellent wear resistance. The camshaft or camshaft lobes are made from a malleable cast iron and the cam followers are made from a carbonitrided 52100 or 4130 steel to provide excellent wear resistance equivalent to diamond-like coatings at greatly reduced cost.

Wear resistant camshaft and follower material

A multi-layer coating for a smooth contact surface of a clutch plate and a method for manufacturing the same have been developed. This coating can help reduce the prevalence of clutch shudder, noise, and plate wear that is often encountered in a friction-disc clutch mechanism found in a motor vehicle's powertrain. The multi-layer coating may comprise a relatively soft base layer and one or more relatively hard particle layers overlying the base layer. This combination of layers can help provide stable friction characteristics and thermal properties between clutch plate surfaces. One or more optional bonding layers may also be provided between any two adjacent layers to improve the adherent bonding therebetween. At least some of the layers of the multi-layer coating may be applied by a HVO/AF thermal spray procedure.

Coatings for clutch plates

Superhard nanocomposite coatings which are applicable to coating contact surfaces on substrates in a variety of industrial processes are disclosed. In a typical embodiment, the superhard nanocomposite coating includes a refractory metal silicon nitride coating layer having silicon in a concentration of from about 6 atomic percent to about 12 atomic percent.

Multi-layered superhard nanocomposite coatings

A contour measurement system determines three dimensional surface information of an object using a projection moir&eacute; technique to obtain a single fringe pattern that is analyzed using a phase-shift image processing method. A grating is projected onto the object and the reflected fringe pattern is recorded by a camera and stored digitally as an array of pixels. An estimated fringe spacing is then determined for each pixel. Using the estimated fringe spacings, four phase-shifted fringe patterns are generated by correlation integration and then used in a phase calculation to obtain wrapped phase information for the object. This phase information is then unwrapped and normalized, producing a set of data points representative of the unwrapped phase information. Noise suppression using pattern reconstruction and smoothing can be utilized at this point to improve the signal to noise ratio. Thereafter, updated estimated spacings are determined for each data point using a curve fitting function such as a localized least squares fit. The system then performs one or more additional iterations of the correlation integration, phase calculation, unwrapping, noise suppression, and fringe spacing update steps, each time using the newest updated estimated spacing in the correlation integration. After the final iteration, the unwrapped phase information is demodulated and used to calculate the three dimensional coordinates of points on the object surface. A fractional pixel analysis technique is also disclosed for use in the correlation integration and updated estimated spacing calculations.

Image processing method using phase-shifted fringe patterns and curve fitting

A reciprocating engine having an aluminum engine block, and an aluminum piston wherein the piston's skirt has a hard anodized first layer directly on the aluminum and a composite polymer coating atop the hard anodized layer.

Growing community of inventors

Rochester Hills, MI, United States of America

Simon Chin-Yu Tung