38results about How to "Improved damage tolerance performance" patented technology

The present invention relates to a erosion and corrosion-resistance coating system and process thereof. A coating system and process capable of providing erosion and corrosion-resistance to a component, particularly a steel compressor blade of an industrial gas turbine. The coating system includes a metallic sacrificial undercoat on a surface of the component substrate, and a ceramic topcoat deposited by thermal spray on the undercoat. The undercoat contains a metal or metal alloy that is more active in the galvanic series than iron, and electrically contacts the surface of the substrate. The ceramic topcoat consists essentially of a ceramic material chosen from the group consisting of mixtures of alumina and titania, mixtures of chromia and silica, mixtures of chromia and titania, mixtures of chromia, silica, and titania, and mixtures of zirconia, titania, and yttria.

A structural element includes the following elements: a carrier element, a reinforcing element, and a sheathing element. At least a portion of the reinforcing element is enveloped by the sheathing element and the reinforcing element is embedded in the carrier element. Materials of the elements are selected to inhibit crack initiation or propagation in the elements and / or from one element to another. An intermediate layer of a different material may be added between elements to further inhibit crack initiation and propagation and to inhibit corrosion, such as galvanic corrosion.

The invention discloses a preparation method of an Al-Cu-Li-X series aluminum lithium alloy sheet. The sheet prepared by the method is 0.8mm-8.0mm in thickness. The method comprises the following steps: cogging and hot-rolling homogenized slab ingots to a specified thickness and coiling; carrying out annealing treatment, uncoiling and carrying out band-type cold-rolling; carrying out intermediate annealing according to deformation during cold-rolling, thus obtaining the sheets with uniform thicknesses. The sheets can be in different states after being subjected to solution treatment, prestretching and aging treatment, so as to meet different usage requirements. Compared with the prior art, the aluminum lithium alloy sheet with high surface quality, uniform sheet size and smooth sheet shape is prepared by the method through band-type cold-rolling. The sheets can be in different states by different heat-treating processes, so as to meet usage requirements under different application conditions.

The present invention provides aqueous compositions for making damage tolerant coatings comprising a blend of (i) from 2 to 30 wt. %, based on the total weight of solids in the composition, of an acid or anhydride functionalized polyolefin dispersion having an average particle size of from 0.2 to 5 microns, and (ii) a film forming dispersion of one or more epoxy resins chosen from epoxy resins having an epoxy equivalent weight (EEW) of from 150 to 4,000 having an average particle size of from 0.2 to 1.0 microns, wherein the polyolefin dispersion is stabilized with from 2 to 8 wt. %, based on the total weight of solids in the composition, one or more anionic surfactants, such as a sulfate containing surfactant, and, further wherein, the compositions have a pH of from 3 to 8.

The invention discloses a multi-scale self-lubricating tungsten carbide-based composite material, which is composed of multi-scale particles and metal Nb fibers distributed in a network structure, the multi-scale particles are distributed around the metal Nb fibers, and the multi-scale particles include micron-sized WC particles , submicron NbC particles dispersedly distributed, uniformly distributed self-lubricating phase and binder phase, the volume fraction of micron-sized WC particles in the composite material is 60‑80%, the volume fraction of self-lubricating phase is 2.2‑10%, sub The volume fraction of micron-sized NbC particles is 10-20%, the volume fraction of the binder phase is 2-10%, the volume fraction of metal Nb fibers is 5-10%, and the sum of the volume percentages of the above components is 100%. The invention also discloses a method for preparing a multi-scale self-lubricating tungsten carbide-based composite material. The prepared multi-scale self-lubricating tungsten carbide-based composite material not only has the characteristics of high strength and wear resistance of traditional self-lubricating wear-resistant ceramic materials, but also has good toughness and damage tolerance properties.

The invention discloses a heat treatment process of a titanium alloy, and belongs to the technical field of material science. The heat treatment process is mainly as follows: the heating temperature T of the first heating treatment is greater than or equal to (Tbeta-50) DEG C and less than or equal to (Tbeta+60) DEG C, the holding time t is equal to eta 1*delta max, the delta max is the maximum section thickness of a titanium alloy forged piece, the eta 1 is a heating coefficient, the value of the heating coefficient is 0.6-1.5min / mm, after the heat preservation on the forged piece is completed, the forged piece is discharged from a furnace and is subjected to air cooling, wind cooling, oil cooling or water cooling to a room temperature; the heating temperature T of the second heating treatment is greater than or equal to 650 DEG C and less than 780 DEG C, the holding time t is equal to (eta 2*delta max) / 2, the delta max is the maximum section thickness of the titanium alloy forged piece, the eta 2 is a heating coefficient, the value of the heating coefficient is 0.3-1.2min / mm, after the heat preservation on the forged piece is completed, the forged piece is discharged from the furnace and is subjected to air cooling to a room temperature; and the heating temperature T of the third heating treatment is greater than or equal to 480 DEG C and less than 650 DEG C, the holding time t is greater than or equal to 240min and less than or equal to 600min, and after the heat preservation on the forged piece is completed, the forged piece is discharged from the furnace and is subjected to air cooling to a room temperature. The heat treatment process solves the problems that after near-beta, metastable beta-type and fully-stable beta-type titanium alloys are subjected to solution treatment and ageing, the side and heart of the forged piece have large difference in structure properties, and is particularly suitable for preparing the high-strength titanium alloy forged piece with uniform structure properties and a large section / variable cross section.

The invention relates to a method for improving the damage-tolerance property of a 2,000-type aluminium alloy plate material. In the method, preferable hot-rolling outlet temperature, high-temperature softening treatment and smaller cold-rolling deformation in softening treatment process can be controlled, so that intercrystalline energy storage of the material is reduced, recrystallization degree is controlled and a malleableized texture is formed. By the method, the service life of the 2,000-type material such as 2,024, 2E12 and the like is prolonged by 2 to 4 times; the crack propagation rate is reduced to 1 / 4 to 1 / 2 of the original crack propagation rate; the production efficiency is improved; and the energy is further saved.

The invention provides a thermal processing process for improving the damage tolerance performance of a titanium alloy forge piece. The thermal processing process comprises the following steps: (1) carrying out solution treatment on a titanium alloy forge piece forged below a phase transformation point temperature; (2) after the solution treatment, cooling the titanium alloy forge piece to a temperature which is 60-80 DEG C lower than the phase transformation point, and carrying out air cooling until the titanium alloy forge piece reaches a room temperature; and (3) carrying out ageing treatment on the air-cooled titanium alloy forge piece, and carrying out air cooling until the titanium alloy forge piece reaches a room temperature. By utilizing the titanium alloy forge piece, with an initial microscopic structure containing an equiaxed structure, a basket-weave structure or a duplex structure, forged below the phase transformation point temperature, as a thermal processing object, the thermally processed titanium alloy forge piece has a relatively high strength and good plasticity and tenacity and simultaneously has relatively low fatigue crack extending rate, so that the limitation that the strength, plasticity and damage tolerance performance of titanium alloy which is subjected to traditional solution treatment-ageing treatment or solution furnace cooling treatment are difficult to be well matched is broken through.