Patent
Abrasive surface coating process for superalloys
TLDR
In this paper, a combination of sintering, plasma arc spraying, hot isostatic pressing and chemical milling is used to form an abrasive surface on an article.Abstract:
A combination of sintering, plasma arc spraying, hot isostatic pressing and chemical milling is used to form an abrasive surface on an article. Alumina coated silicon carbide particulates are clad with nickel and sinter bonded to the surface of a superalloy turbine blade tip. An impermeable layer of plasma arc sprayed superalloy matrix is deposited over the particulates and then has its inherent voids eliminated by hot isostatic pressing. The abrasive material so formed on the surface is then machined to expose the particulates. Next, a portion of the matrix is removed so that the machined particulates project into space and are thus best enabled to interact with abradable ceramic air seals in a gas turbine engine. The ceramic particulates are sized so they are larger than the finished thickness of the abrasive and they have small aspect ratios. Thus, a high density spacing can be achieved while at the same time it is insured that matrix adequately surrounds the particles and holds them in place during use.read more
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Patent
Thermal barrier coating applied with cold spray technique
TL;DR: In this paper, a process for applying a thermal barrier coating (51) to a turbine component (50) including the step of depsoiting a bond coating layer (56) by a cold spray process is described, which allows the surface of the bond coating material layer to be formed with a predetermined surface roughness or with a plurality of micro-ridges.
Patent
Cold spray repair process
TL;DR: In this article, a cold spray process was used to provide a grit blasting effect prior to depositing the material in order to remove contaminants ( 48 ) from the surface of the part.
Patent
Mixed powder deposition of components for wear, erosion and abrasion resistant applications
Brij B. Seth,Gregg P. Wagner +1 more
TL;DR: In this paper, a process for forming abrasive coating by co-depositing hard particles within a matrix material onto a substrate using a cold spray process is described. But this process is not suitable for abrasive materials.
Patent
Repair of gas turbine engine component coated with a thermal barrier coating
Peter J. Draghi,Peter Wrabel +1 more
TL;DR: In this article, a gas turbine engine component with a thermal barrier coating that includes a metallic bond coat and a ceramic top coat is repaired by removing the ceramic topcoat from an engine-run GTLG engine component and inspecting the component.
Patent
Columnar zirconium oxide abrasive coating for a gas turbine engine seal system
TL;DR: A gas turbine engine seal system includes a rotating member having an abrasive tip disposed in a rub relationship to a stationary, abradable seal surface as discussed by the authors, which comprises a zirconium oxide abrasive coat having a columnar structure.
References
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Patent
Abradable ceramic seal and method of making same
TL;DR: An abradable ceramic seal coating on at least one of a pair of members having relative rotational movement is described in this paper, the coating being formed of stabilized zirconia which is codeposited with a thermally decomposable organic powder.
Patent
Graded metal-to-ceramic structure for high temperature abradable seal applications and a method of producing said
TL;DR: Abradable seal composite as mentioned in this paper is an abradable composite with a porous, abrasionable ceramic surface layer which is resistant to high temperature oxidation and a metallic bottom layer capable of being bonded to a metallic substrate.
Patent
Alumina coated silicon carbide abrasive
Johnson G F,Schilke P W W +1 more
TL;DR: Disclosed is an improved abrasive material particularly useful as a dispersoid in metal matrices to provide articles of use having superior abrasive properties, especially at elevated temperatures as mentioned in this paper.
Patent
Abrasive particles encapsulated with a metal envelope of allotriomorphic dentrites
TL;DR: Abrasive particles are improved in function by encapsulating them with a metallic envelope; preferably the envelope is made of a pure metal in dendritic crystalline form as mentioned in this paper.
Patent
Co-spray abrasive coating
Harry E. Eaton,Richard Novak +1 more
TL;DR: In this article, various concepts for obtaining good adherability of the coating to an underlying substrate and for maintaining angularity of the grit particles are discussed, employing simultaneous contact of the particles with matrix material at the surface of the substrate to be coated.