53results about How to "Improve abradability" patented technology

A enhanced abradable friable graded insulator FGI results from the laser patterning of a coating where a series of top surfaces reside on a series of columns such that the walls of the columns are not significantly densified relative to the interior of the columns. Patterns can be generated where the columns are oriented independently normal to or at an acute angle to the top surfaces. The cross sections of the top surfaces are formed to conform to the average dimensions of the spheres of the FGI coating. The cross sections of the top surfaces can be more than 1.5 times the diameter of the spheres. Various patterns of top surfaces can be used including regular, random, quasiperiodic patterns. A gradient of abradability can be imposed on the coating.

An abradable coating system (2-8) for a turbine or a compressor is proposed has at least one layer of woven or non-woven tissue (15) or foam made of: ceramic, glass, glass-ceramic, ceramic-metal composite and combinations thereof. A free-standing preformed element (18) has at least one layer of such a woven or non-woven tissue or foam is filled with fillers and/or binder. A method prepares such a system. Finally, a method for the repair of an abradable coating portion of a turbine or the compressor component (9) includes in a first optional step that the damaged portion is at least partly removed and/or cleaned and/or surface treated, and in a second step at least one free-standing preformed abradable coating element (18) or a complete abradable coating system is attached to the component (9), preferably by using a matrix, wherein for example only a center part (2) or a fraction of a center part (2) is replaced.

An air seal for use in a gas turbine engine provides improved durability, particularly at higher temperatures. The seal includes a seal substrate and an abradable seal layer on the substrate. The abradable seal layer is composed of a densified polyimide foam, preferably a thermomechanically densified foam. The seal is bonded to a stationary engine component such as a stator box or a case.

Ceramic abradable materials, in particular thermally sprayable ceramic abradable powder materials, and abradable seals formed by thermally spraying the materials include dysprosia (Dy₂O₃) and zirconia (ZrO₂). Coatings are porous whereby the porosity, in part, is induced by plastic or fugitive phases. Abradable seal coatings comprising dysprosia and zirconia exhibit improved thermal shock and sintering resistance and can be worn into tolerance by untreated, bare turbine blades, at least in certain regimes of relative blade speed and coating porosity. Ceramic abradable seal coatings comprising dysprosia and zirconia can be used up to 1200° C.

Turbine and compressor casing abradable components for turbine engines include abradable surfaces with a zonal system of forward (zone A) and rear or aft sections (zone B) surface features. The zone A surface profile comprises an array pattern of non-directional depression dimples, or upwardly projecting dimples, or both, in the abradable surface. The dimpled forward zone A surface features reduce surface solidity in a controlled manner, to help increase abradability during blade tip rubbing incidents, yet they provide sufficient material to resist incoming hot working fluid erosion of the abradable surface. In addition, the dimples provide generic forward section aerodynamic profiling to the abradable surface, compatible with different blade airfoil-camber profiles. The aft zone B surface features comprise an array pattern of ridges and grooves.

The invention provides a high temperature sealing coating and a making method thereof. The high temperature sealing coating comprises a sealing coating bottom layer and a sealing coating surface layer; the material of the sealing coating bottom layer is NiCoCrWMoSiB high temperature brazing alloy or NiCrCoSiB high temperature brazing alloy; and the material of the sealing coating surface layer comprises 5-12wt% of polyphenyl ester, 5-10wt% BaF2/CaF2, and the balance of NiCrAlYSi alloy or NiCrAlY alloy or NiCoCrAlTaY alloy or CoCrAlY alloy. The making method of the high temperature sealing coating comprises the following steps: making the sealing coating bottom layer on a substrate through cold gas dynamic spraying; making the sealing coating surface layer through plasma spraying; carrying out heat insulation on the substrate sprayed with the high temperature sealing coating at 500DEG C to obtain a pre-product; and carrying out vacuum diffusion treatment on the pre-product at 1150-1250DEG C for 15-30min to complete the production of the high temperature sealing coating. The high temperature sealing coating has the characteristics of low hardness, self lubrication, low friction coefficient and long life, can work at a temperature of 1150DEG C, and can be used for sealing gas paths of aeroengines and ground gas turbine high pressure turbines.

The invention relates to a multi-components hot spray flexible wire and a preparation method thereof. A flexible wire which is good in spraying technology adaptability is prepared through a method of mechanical milling, rubber mixing and squeezing by a slow vernier hydraulic press. The wire comprises Ni, Al, Cr, W, Co, Mo, Ti, Cu, C, BN and Si oxide or salts thereof, wherein the raw materials can be simple substance powder or alloy or compound, while the oxides can be one or more or the combination of a few materials. The binder can be inorganic materials, and the combination of some additives and addition agents is also included. The coating prepared by the wire has the advantages that the coating combines well with a matrix, the wearable performance is good, and the thermal shock resistance and salt-fog resistance are excellent. The wire has a wide application range, which can be applied in the surface modification and the reproduction of mechanical equipment.

The invention relates to a multi-components bar applied to a hot spray wearable sealing coating and a preparation method thereof. A bar which is good in spraying technology adaptability is prepared through a method of mechanical milling, bonding at room temperature and squeezing. The bar comprises Ni, Si, Cu, Al, Cd, BN, C and oxides, binders and other materials. The raw materials can be simple substance powder or alloy or compound, and the oxides can be one kind or more or the combination of a few materials. The binder can be inorganic materials and can also be organic substances, and the combination of some additives and addition agents is also included. The coating prepared by the bar has the advantages that: the coating combines well with a matrix, the wearable performance is excellent, and the thermal shock resistance and salt-fog resistance are excellent. The bar has wide application range and can be applied to the surface modification and the reproduction of mechanical equipments.

The invention discloses a marine-corrosion-resisting and wear-resisting material, a coating and a preparation method thereof and belongs to the technical field of fuel gas turbines. Single-phase CuAlwith excellent marine-corrosion-resisting and wear-resisting properties is adopted as a wear-resisting face layer skeleton component, insulating polyester or boron nitride and the like are adopted asa wear-resisting component, CuAl with chemical compositions completely consistent with those of the wear-resisting face layer skeleton component is adopted as a bottom layer material, and the coatingis prepared through a thermal spraying method. According to the material, the coating and the preparation method, the problems that a traditional wear-resisting coating skeleton component does not resist to corrosion, galvanic corrosion is generated between the compositions and between a face layer and a bottom layer due to the potential difference, and coating corrosion is caused by easy seepageof corrosion media to the coating and a base body interface are solved, and the material is widely applied to marine gas turbines serving in marine environment, aircraft engines, ground fuel gas turbines and the like.

The invention relates to a wearable seal coating material, in particular to a cyclic silicon resin seal coating used for an industrial centrifugal compressor. The cyclic silicon resin seal coating comprises the following components in percentage by weight: 65-80% of cyclic silicon resin, 15-25% of filling material A and 5-10% of filling material B, wherein the filling material A is one or more than two of polyether ether ketone, polybenzoate and polytetrafluoroethylene, and the granularity is 50-100 microns; when more than two of polyether ether ketone, polybenzoate and polytetrafluoroethylene are mixed, the mixing ratio can be an any ratio; the filling material B is one or more than two of hexagonal boron nitride, graphite and bentonite, and the granularity is 20-50 microns; and when more than two of hexagonal boron nitride, graphite and bentonite are mixed, the mixing ratio can an any ratio. The invention effectively increases the scraping property of the coating, can control and regulate the hardness of the coating and has self lubricating property so that the hardness of the coating can reach the range applicable to scraping, the abrasion of vanes is reduced, the wearable property of the coating is increased, and the invention can ensure that contact wearing can not endanger a rotor.

Provided is a gas turbine that can solve a problem in which a seal fin of a turbine blade is abraded by a brazed place of a honeycomb seal.

A gas turbine 100 includes a compressor 10, a combustor 20, and a turbine 30. The turbine 30 includes: a honeycomb seal 7 disposed so as to be secured to a casing side in a clearance between the casing 1 and turbine blades 5A-5C rotating around a rotating shaft 4 extending in a longitudinal direction of the casing 1 and a seal fin 6 provided on an end face of each of the turbine blades 5A-5C facing the honeycomb seal 7, the seal fin 6 extending in a direction perpendicular to the rotating shaft 4. The honeycomb seal 7 is formed by a plurality of corrugated thin sheet metals 71 overlapped with each other at walls of node 71a thereof and the walls of node 71 blazed with each other, each of the corrugated thin sheet metals 71 having trapezoids alternately continued. A longer direction (Y1 direction) of the wall of node 71a of the honeycomb seal 7 is tilted with respect to the rotational direction (Z direction) of the turbine blades 5A-5C.

The intention discloses a room-temperature curing coating with an abradable sealing function. The room-temperature curing coating is a putty-like material formed by mixing a component A and a component B, wherein the component A consists of liquid rubber, liquid epoxy resin and talcum powder; and the component B is an amine curing agent. During use, the component A and the component B are fully mixed according to the mass ratio of 100: 8-100: 15, the mixture is applied to the surface of a component through a blade coating method, and the abradable seal coating is obtained after full curing atthe room temperature. The material has good adhesive force to metal and composite material base materials, has excellent abradability and airflow erosion resistance, is used for an aero-engine fan/supercharging level part, when a coating layer rubs with a running part, the coating layer can be ground, the part is not abraded. Meanwhile, the gap between a rotating part and a non-rotating part can be controlled, the effects of air sealing and oil sealing are achieved, loss of compressed air flow and leakage of lubricating oil are reduced, the efficiency of an engine is improved, and oil consumption of the engine is reduced.

The invention discloses a nanometer zirconia abrasion sealing composite paint material, which comprises the following parts: base-phase material, filling material A, filling material B, adhesive and water, wherein the base-phase material is 70-75% in the base-phase material, filling material A and filling material B; the filling material A is 14-20% in the base-phase material, filling material A and filling material B; the filling material B is 9-15% in the base-phase material, filling material A and filling material B; the adhesive is 2-5.5% in the base-phase material, filling material A and filling material B; the water is 70-78% in the base-phase material, filling material A, filling material B and adhesive.

The invention provides a turbine moving blade with bevelled prism cavities formed in a blade top. The turbine moving blade comprises a blade body, the multiple bevelled prism-shaped cavities are formed in the blade top of the blade body from the front edge to the tail edge, the bottom faces of the prism-shaped cavities adopt a bevelled mode, the ratio of the maximum height of the prism-shaped cavities to the height of the blade body is 0.5%-4%, and the beveled angles for beveling the bottom faces of the prism-shaped cavities are within the range of 30-60 degrees. According to the turbine moving blade with the bevelled prism cavities formed in the blade top, a part of leakage fluid entering a gap enters the prism-shaped cavities to be curled up to form vortexes, on the one hand, kinetic energy of the gap fluid is dissipated, on the other hand, the jet blocking effect on the gap fluid above the cavities is formed, then the purpose of controlling blade tip leakage flow of a turbine is achieved, the bottom faces of the prism cavities are beveled, the vortex intensity and development direction of the vortexes in the cavities are changed, the mixing effect of the fluid flowing into/flowing out of the cavities and the fluid in the gaps on the upper portion is enhanced, inhibiting turbine blade tip leakage flow is more advantageous, and the structure is simple.

Provided is a versatile heat-curable resin composition for semiconductor encapsulation that has a favorable water resistance and abradability, and exhibits a superior fluidity and a small degree of warpage even when used to perform encapsulation on a large-size wafer.

The heat-curable resin composition of the invention contains:

• (A) a cyanate ester compound having not less than two cyanato groups in one molecule;
• (B) a phenol curing agent containing a resorcinol-type phenolic resin;
• (C) a curing accelerator; and
• (D) a spherical inorganic filler.

The invention discloses a coating for an interstage sealing device of a compressor. The coating comprises the components in percentage by weight: not more than 35% but not zero of nickel powder with the granularity of less than or equal to 50 nm , 60-90% of graphite powder with the granularity of less than or equal to 50 nm, and not more than 5% but not zero of silicon powder with the granularity of less than or equal to 50 nm. The coating is based on the special performance requirements of the CCPP generator set gas compressor taking the byproduct gas as the fuel in domestic iron and steel enterprises on an interstage sealing coating layer; the coating enabling the gas compressor to have good erosion resistance, abrasion resistance, self-lubricating performance and corrosion resistance under the working condition of being rich in corrosive pollutants such as benzene, naphthalene, tar and sulfide is provided, and the high sealing performance of the compressor in the compression process can be guaranteed.