摘要:
PROBLEM TO BE SOLVED: To provide a method which materializes control of coating composition and microstructure to deposit nanostructured and microstructured layers either sequentially to form layered coatings, or simultaneously to form either composite coatings or continuously gradient coatings to address diverse applications.SOLUTION: A method of producing a composite plasma spray coating using simultaneous feeding of powder and solution precursor feedstock in a plasma spray gun is disclosed, comprising the steps of: (a) spraying a powder feedstock comprising micron sized particles into a plasma spray plume; and (b) spraying a liquid feedstock comprising liquid precursor solution into the plasma spray plume, wherein the spraying of the powder feedstock and spraying of the liquid feedstock are independently controllable. Thermal barrier coatings produced using the new method have demonstrated twice the life compared to conventional air plasma sprayed coatings.
摘要:
A ceramic top coat is formed over a heat resistant alloy including Ni as a main component through a bond coat which contains Ni essentially as a main component, Cr, and Al. The alloy for the bond coat can include Si in the range from 0 to 10 wt.%. As a result, in a long time operation, the spalling damage of a ceramic top coat is not easily created and the deterioration of the mechanical properties is small.
摘要:
A ceramic material suitable for use as a coating, such as a porous thermal barrier coating (TBC 26) on a component (10) intended for use in a hostile thermal environments. The coating material consists essentially of zirconia stabilized by at least one rare-earth metal oxide and further alloyed to contain a limited amount of titania. Rare-earth metal oxides of particular interest are lanthana, ceria, neodymia, europia, gadolinia, erbia, dysprosia, and ytterbia, individually or in combination. Zirconia, the rare-earth metal oxide, and titania are present in the coating material in amounts to yield a predominantly tetragonal phase crystal structure. The amount of titania in the coating is tailored to allow higher levels of stabilizer while maintaining the tetragonal phase, i.e., avoiding the cubic (fluorite) phase.
摘要:
The flow machine is furnished with an abradable ( 10 ) made of a particle composite material. This so-called composite ( 1 ) contains granular core particles ( 2 ) of a ceramic material. The surfaces ( 20 ) of the granular core particles carry functional layers ( 22 ) which form an intermediate phase of the composite which is stable at a high operating temperature. The intermediate phase in this process has been produced in situ at least in part by a chemical reaction of a precursor material ( 22 ') and material ( 21 ) of the granular core particles on the particle surfaces ( 20 ). Bonds ( 23 ) are formed between the granular core particles arranged in a porous composite by the intermediate phase. These bonds have a breaking characteristic for abradables.