Westinghouse Electric

About: Westinghouse Electric is a company organization based out in Cranberry Township, Pennsylvania, United States. It is known for research contribution in the topics: Brake & Circuit breaker. The organization has 27959 authors who have published 38036 publications receiving 523387 citations.

Thermodynamics and kinetics of oxidation of hot-pressed silicon nitride

Abstract: The “passive” oxidation behaviour of silicon nitride hot-pressed with 1 wt% MgO has been studied in dry oxygen in the temperature range 1000 to 1400‡ C. The oxidation follows the classical parabolic behaviour with an apparent activation energy of 375 kJ mol−1. Except for minor amounts of a glass and cristobalite, the oxide film consists predominantly of MgSiO3 in which various impurity elements, e.g. Ca, Fe, Al, etc., concentrate. The outward diffusion of Mg2+ and impurity cations from the grainboundary glass phase through the oxide film appears to be oxidation rate controlling.

Formation of titania-silica glasses by low temperature chemical polymerization

Abstract: Clear titania glasses were formed by a low temperature chemical polymerization technique in the TiO2SiO2 binary. The chemical method developed requires initial formation of soluble intermediate species capable of polymerizing into an oxide network. The process provides formation of an essentially organic-free, often monolithic, oxide network at temperatures below 500°C. Since the glass formation takes place by low temperature chemical polymerization, the high-temperature reactions such as crystallization, phase separation, etc., which restrict glass formation, can be avoided in the entire SiO2TiO2 binary.

Gas turbine ultra low NOx combustor

Abstract: A gas turbine combustor having a pre-mixing zone and a combustion zone separated by a barrier plate. A plurality of concentrically arranged annular passages, into which lean mixtures of fuel and air are introduced, are disposed in the pre-mixing zone. Each of the annular passages has a discharge end in which a plurality of swirlers are circumferentially arranged that allow fuel/air mixtures flowing through the annular passages to enter the combustion zone, the swirlers acting as flame holders. A toroidal fuel manifold upstream of each of the annular passages allows the fuel/air ratio in each annular passage to be individually controlled. The firing temperature of the combustor is increased by sequentially supplying fuel to each annular passage in turn, with the innermost passages being supplied with fuel first. A pilot fuel assembly is centrally disposed with respect to the annular passages and has swirler vanes and an ignitor.