摘要:
An article includes a silicon-containing region including surface features on a surface thereof. The surface features include depressions, protuberances, or combinations thereof. At least one outer layer overlies the surface of the silicon- containing region. A constituent layer is provided on the surface of the silicon-containing region and between and contacting the silicon-containing region and the at least one outer layer. The constituent layer is formed by constituents of the silicon-containing region and is susceptible to creep within an operating environment of the article. The surface features physically interlock the at least one outer layer with the silicon- containing region through the constituent layer.
摘要:
An article includes a substrate and a coating provided on a surface of the substrate. The coating includes at least one metal silicide layer consisting essentially of MoSi2 or WSi2 or (Mo, W)Si2 or a platinum group metal silicide and at least one layer consisting essentially of Si3N4.
摘要:
It has been discovered that electroslag remelting of titanium metal or alloys under controlled partial pressures of nitrogen, and somewhat oxygen, can dissolve nitrogen-rich inclusions to help eliminate or reduce initiation sites for cracks. The process for the electroslag remelting of titanium and titanium alloys ensures that nitrogen-rich inclusions are dissolved or at least minimized during the melting process.
摘要:
A treated refractory material includes a sintered porous refractory material having one or more protective materials disposed within pores of the refractory material, wherein the protective material is selected from the group consisting of aluminum oxide, chromium oxide, silica, rare earth oxides, rare earth zirconates, titanium oxide, mullite, zirconium oxide, zirconium silicate, yttrium oxide, magnesium oxide, iron oxide, and blends thereof. Methods of preparing the treated refractory material are also provided. The treated refractory material provides protection from the penetration of slag and extends the service life of the refractory.
摘要:
A light source (71, 80, 90) includes a base (72), a light-transmissive envelope (73, 93) 'coupled to the base (72), a composition (10) disposed within the light-transmissive envelope (73, 93), and a gas phase contained by the envelope (73, 93) for suppressing vaporization of the composition (10) at operating temperatures greater than about 2000 Kelvin. The composition (10) includes a first region (12) and a second region (14) and is operable to suppress or reflect photons having a wavelength greater than about 700 nm and to emit or transmit photons having a wavelength between about 400 nm and about 700 nm.
摘要:
A high temperature stable composition includes a first material and a second material interspersed within the first material so as to form a structure. The composition is structured such that the first and second materials maintain a periodicity of distribution between about 100 nm and about 1000 nm, and the composition is operable to reflect photons having a wavelength greater than about 700 nm and to emit or transmit photons having a wavelength between about 400 nm and about 700 nm at temperatures greater than about 2000 Kelvin for at least about 10 hours. The first material is selected from the group consisting of carbides, nitrides, borides and oxides of transition metals and combinations thereof . The second material comprises a similar compound, a transition metal or a gas phase.