They can be applied to many other rotating machines by thermal spray processes. The information and opinions in this report were prepared by line2line, inc. Coating systems on a surface of a cmc component, such as a cmc shroud, are provided. An abradable coating on the cmc shroud will wliminate this problem and miantain the integrity of both the stationary and rotating parts.
For albn, the coating suffered severe corrosion damages due to the poor corrosion resistance of the al matrix to the aggressive cl. Coatings of these abradables combine good thermal stability at high temperature, good thermal shock resistance, adequate erosion resistance and good. These include the coating material to be applied, a powder feeder to deliver the coating material to the spray gun, the hvof spray gun that will heat the coating material and propel it to the workpiece, and a control system that accurately controls the gas flows required for hvof combustion. Evaluation of abradable seal coating mechanical properties. Adaptive graphite coatings improve fit and function of pistons, turbos, and other precision devices page 3 of 9 thin piston skirt coatings also have limited ability to limit damage from foreign particles.
High velocity oxyfuel hvof thermal spray deposition of. There are a number of different abradable coating types. A novel nitibn composite abradable coating and two traditional nic and nibn coatings were manufactured with nial as the bond layer using thermal spray technology and their corrosion behaviors were investigated. Should contact occur between rotor and seal, the rotating teeth will cut into the seal and remove some of its material.
Thermally sprayed abradable coating technology for sealing in gas turbines the use of thermal spray technology has revolutionised turbomachinery sealing technology by being able to tailor design abradable thermal spray powders and spray them to a designated hardness range, using thermal spray technology to high levels of microstructural control. The microstructure is essentially a composite material consisting of an alsi metal matrix, containing a solid lubricant phase of hbn hexagonal boron nitride bound to the matrix using an organic adhesive. The microstructure of an assprayed alsihbn coating. Thermal spray abradable materials for clearance control coatings abradable coating solutions improve safety and reduce fuel consumption and emissions in turbomachinery. Unlike powders provided for use with plasma spray guns, the powder is essentially free of polyester or other organic fugitive additives provided to increase porosity. Conicralybnpolyester composite blend with a plasma gun and heat treating.
Freestanding abradable coating manufacture and tensile test. Nov 20, 2015 abradable powder coating apc is made from plastic and graphite. The target goals for the engine use of the abradables were. When the corrosive substances penetrated into the coating and arrived at the substrate, serious galvanic corrosion might occur between the coating and the. Axial iii abradable coatings can be applied with consistent quality at high feed rate and deposition efficiency. Simulated occlusion experiments and electrochemical tests. A threelayer extruded polyethylene coating is used for various types of pipelines including sewer systems, water pipelines, gas pipelines and other channels that are dangerous to water. Very porous with many unreacted or unmelted particles which would by normal standards be considered as a very poor coating produced by very careful. By adding polymer or graphite into metallic or ceramic spray powders to form a composite powder or powder blend, as shown in table 7. The successful coating consists of a specially heat treated mcraiy bond coat, applied by hvof, covered with a proprietary abradable top coat, applied by air plasma spray.
An abradable coating that has a hardness of 3040 at hr 15y scale gives a ge erosion number of 4 which is a compromise between abradability and strength of the coating for titanium based alloys. In order to deposit thick coatings, certain problems have to be overcome. The coating system can include an environmental barrier coating 200 on the surface of the cmc component and an abradable coating 202 on the environmental barrier coating 200 and defining an external surface opposite of the environmental barrier coating 200. Influence of abradable coating wear mechanical properties. Abradable coating an overview sciencedirect topics. Tests performed on most commonly used abradable material alsipoly have shown that increase of axial iii feed rates to 200 gmin had no detrimental effects on microstructure of the coating. Jun 20, 2015 thermal spraying of abradable plasma coating in the present work the abradable coating is done by thermal spraying technique using a 80 kw plasma spray system with a sulzer metco 9 mb gun. Influence of turbocharger abradable coating on fuel economy compressor wheel attachment to the shaft can be via a throughhole throughbore wheel or a blind hole boreless wheel. Apr, 2018 an abradable coating is a coating made of an abradable material meaning if it rubs against a more abrasive material in motion, the former will be worn whereas the latter will face no wear.
September learn how and when to remove this template message. As a result, the coating may be metalrich, leading to excessive hardness and a loss of the coatings abradable properties. An abradable coating is a coating made of an abradable material meaning if it rubs against a more abrasive material in motion, the former will be worn whereas the latter will face no wear abradable coatings are used in aircraft jet engines in the compressor and turbine sections where a minimal clearance is needed between the blade tips and the casing. Evaluation of abradable seal coating mechanical properties xiao ma, allan matthews to cite this version. The target goals for the engine ume of the abradables were. Powder coating books pdf click to enlarge the book powder coating technology hand book covers powder coating, research overview of uvcurable powder coatings, uv curable powder coatings, polyester powder coatings, developments in resins for powder coatings, calcium carbonate extenders for powder coating systems thermally curable powder coatings, where are powder. Polyethylene coatings have been in use to protect buried pipelines from corroding since the 1950s. Introduction to abradable powder coatings distribution, quotations and duplications in any form is only permitted upon prior written consent of line2line, inc. Save some money by coating your pistons with abradable powder. Adaptive graphite coatings improve fit and function of. The teeth 918, 920, 922 are arranged to interact with patterned abradable coating regions 924, 926, 928 on a surrounding stator shroud 930.
Introduction structural model contact dynamics abradable coating modeling results conclusion and perspectives outline 1 introduction 2 structural model 3 contact dynamics 4 abradable coating modeling 5 results 6 conclusion and perspectives a. Pdf the application of abradable seal coating is an effective method to improve the. Alsi coating, which contains no additional secondary filler, only showed acceptable abradability at. Overview of sulzer metco compressor and turbine abradable. There are a number of different abradable coating types, to cater for different operating temperatures, corrosive environments and mating materials. The powder is applied using a combustion spray process and. An example of an abradable material currently used in the compressor section of a gas turbine is the air plasma applied alsihbn coating. The presented wear mechanisms shall combine at all times during an.
Pdf modeling of the mechanical behaviour of abradable coatings. Abradable coatings are used in aircraft jet engines in the compressor and turbine sections where a minimal clearance is needed between the blade tips and the casing. Using abradable powder coatingstm line2line coatings. Whether for aviation gas turbines, or power generation gas or steam turbines, we have abradable materials for your clearance control applications. Abradable seal having particulate erosion resistance united. Thermally sprayed abradable coating technology for sealing. Pdf evaluation of an alsipolyester abradable seal coating. L2l needs your finished bore sizes fbs, the manufacturers recommended piston to wall clearance rpwc, and the target coating thickness tct. A tier 1 automotive supplier reports increased volumetric efficiencies and enhanced sealing on supercharger rotor sets through the use of a patented abradable powder coating. Thermally sprayed abradable coating technology for. The influence of composition and microstructure on the. High velocity oxyfuel hvof thermal spray deposition of functionally graded coatings mahbub hasan the present study investigates an innovative modification of a hvof high velocity oxyfuel thermal spray process to produce functionally graded thick coatings.
Abradable seal having particulate erosion resistance. Overview of sulzer metco compressor and turbine abradable technology scott wilson 8th international charles parsons turbine conference 05 sep 2011 08 sep 2011, university of. We propose three candidate coating materialssystems for evaluation as abradable. Freestanding abradable coating manufacture and tensile. Overview of sulzer metco compressor and turbine abradable technology scott wilson 8th international charles parsons turbine conference 05 sep 2011 08 sep 2011, university of portsmouth, portsmouth, uk. Us20040005452a1 high temperature spray dried composite. The regions 924, 926, 928 form abradable coating seals that may be applied to respective surfaces 932, 934, 936 of the stator shroud 930 to modify fluid flow over the surfaces 932, 934, 936. Thermally sprayed abradable coating technology for sealing in.
Threelayer extruded polyethylene coating 3lpe corrosionpedia. This results in abradable coating recognition by engine manufacturers. Whether for aviation gas turbines, or power generation gas or steam turbines, we have abradable materials for. Thanks to recent innovations in coating technology, its now. Save some money by coating your pistons with abradable. Process design and monitoring for plasma sprayed abradable. Corrosion behavior of an abradable seal coating system. Alsi coating, which contains no additional secondary filler, only showed acceptable. Abradable coatings used for gas path seals in turbine engines.
Make sure to have a local copy of the file before you begin. Phenomenological modeling of abradable wear in turbomachines. Abradable coating, finite elements, hr15y hardness, interaction bladeabradabl e. Aug 23, 2001 the use of abradable coatings has enabled increased efficiency gas turbine engines by reducing the clearances between fan and shroud and increasing the operating temperature. However, slight rub of the shrouds with rotor blades can cause fiber damagebreakage leading to a premature component failure.
Thickness measurement during coating process was done using electromagnetic induction based gauge elcometer 456. An improved method of forming an abradable thermal barrier coating comprises providing a spraydried powder of mcraly and a solid lubricant, such as conicralybn. Do not alter metal to metal clearances to accommodate apc. Jan 25, 2014 this new coating can prevent excessive blade tip wear between 24,000hour inspection intervals at operating temperatures up to 980c. An abradable coating is a coating made of an abradable material meaning if it rubs against a more abrasive material in motion, the former will be worn whereas the latter will face no wear. All of these are done in order to simulate field trials and laboratory testing. Abradable coatingbond strength if the crosshead speed of the tensile test is faster than it needs to be then that condition may be occuring. Thermal spray abradable materials for clearance control. Application of abradable seal to improve compressor.
Abradable coating bond strength if the crosshead speed of the tensile test is faster than it needs to be then that condition may be occuring. Influence of abradable coating wear mechanical properties on. Abradable powder coatings safely reduce operating clearances and friction to improve the efficiency of compressors, pumps, engines, blowers, etc. Abradable powder coating piston coating specification. Save some money by coating your pistons with abradable powder coatings rescue me. In boreless designs, attachment of the wheel to the shaft can be via a threaded connection or welding. In salt spray corrosion testing of the nibn coating, defective sites of the metal matrix were corroded preferentially. Dear all i encounter a abradable coating failuresome top coating peeled off but didnt know. If you are trying to embed a pdf from a web page, right click on the link and use save as to save a copy of the file to the desktop. Abradable coatings are used in aircraft jet engines in the compressor and turbine sections where a minimal clearance is needed between the blade tips and. Introduction structural model contact dynamics abradable coating modeling results conclusion and perspectives contact dynamics masterslave approach abradableblade, contact forces computed from plastic deformation of the abradable element, kuhn and tucker contact conditions. Aapcs safely minimize ipwc for stability, and provide unique mechanisms to resist damage from foreign particles like sand.
Thermal spraying of abradable plasma coating in the present work the abradable coating is done by thermal spraying technique using a 80 kw plasma spray system with a sulzer metco 9 mb gun. As a result, the coating may be metalrich, leading to excessive hardness and. Corrosion resistance of ti 3albn abradable seal coating. The use of abradable coatings has enabled increased efficiency gas turbine engines by reducing the clearances between fan and shroud and increasing the operating temperature. An abradable coating is a coating made of an abradable material meaning if it rubs against a. Abradable seal development for ceramic matrix composite cmc. Corrosion resistance of ti albn abradable seal coating. We have different levels of hardness for different applications, andy suman of line2line coatings explains. Improvements in abradable coatings require various tests, extending from powder fabrication up to choosing the maximum thermal spray procedure. Aug 18, 2016 in various embodiments, the thickness of the abradable coating 81 is about 0. The investigation of suitability of abradable seal materials 79 for application in centrifugal compressors and steam turbines an abradable coating. Abradable coatings increase gas turbine engine efficiency. From within autocad, open or create the file you wish to embed the pdf into.