Refractory ceramics are those which retain their strength and other material properties under high temperatures.
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The invention relates to coated refractorymetal articles and methods for their manufacture and, in particular, to coated refractorymetal articles having improved operating temperature and life capabilities as well as improved resistance to premature catastrophic failure in high temperature oxidizing environments.
In one method aspect of the invention, the refractorymetal substrate is treated such as by grit blasting or other physical or chemical techniques to increase substrate surface roughness which is imparted, in turn, to the free surface of the intermetallic layer formed in situ on the substrate.
Typically, the refractorymetal substrate 2 is fabricated such as by machining, spinning, forming, welding and other known forming techniques to a final shape adapted for use in a particular service application prior to application of layers 4,6 thereon, although the invention is not to be construed as so limited.
Refractorymetals are a class of metals extraordinarily resistant to heat, wear and corrosion.
Household incandescent bulbs contain refractorymetals in their tungsten filaments, and nearly all manufactured goods, particularly those containing metal or electronics, contain or were produced using refractorymetals.
Refractorymetals are used in lighting, tools, lubricants, nuclear reaction control rods, as catalysts, and for their chemical or electrical properties.
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