39results about How to "Mitigate Thermal Mismatch" patented technology

The invention discloses a metal ceramic matrix composite used at the temperature of below 2000 DEG C for a long term. The metal ceramic matrix composite is characterized by being composed of inorganic fibers, an alloy wire and a ceramic matrix. The inorganic fibers are carbon fibers, boron fibers, silicon carbide fibers or mixed fibers thereof, and the diameter of the inorganic fiber is 4-8mu m. The alloy wire is a high-temperature alloy wire such as a niobium-tungsten alloy wire, a tungsten-molybdenum alloy wire or a tungsten-rhenium alloy wire and the like and mainly contains elements such as Nb, W, Mo, Re, Ni and the like, and the diameter of the alloy wire is 0.01-0.5mm. The ceramic matrix is a mixed matrix of silicon carbide, silicon carbide and carbon or a mixed matrix of zirconium carbide and carbon, wherein a preform is formed by knitting continuous carbon fibers and one or more of a chopped niobium-zirconium alloy wire, the niobium-tungsten alloy wire, the tungsten-molybdenum alloy wire, the tungsten-rhenium alloy wire and any other high-temperature alloy wires in a staggered lapping way. The modified high-temperature alloy wire is mixed with knitted carbon fibers to serve as a strengthening and toughening phase of the metal ceramic matrix composite, so that the high-performance oxidation property of a fiber material and the integral toughness of the composite are improved.

The invention relates to the technical field of thermal barrier coatings, in particular to a novel thermal barrier coating structure and a preparation method thereof. According to the method, laser shock is conducted on a DD6 base body, then a microstructure is constructed on the surface of the DD6 base body through picosecond laser, finally, a Gd2Zr2O7 ceramic layer is sprayed on the surface through a PS-PVD technology, the technical problem that a metal bonding layer of a traditional thermal barrier coating is prone to failure can be effectively solved, and the technology is simplified.

An artificial hip joint, which relates to the field of medical equipment, the present invention solves the problem that the femoral neck and the femoral stem in the existing hip joints are mostly integrated structures, and if the femoral neck breaks, it needs to be replaced as a whole; while the existing split structure , no fixed structure, the problem that the femoral neck is easily detached from the femoral stem; and the problem that the substrate coating of the current artificial hip joint has poor wear resistance. The inventive joint includes a ball, a femoral neck, an artificial femoral insert and a connecting joint. The coating is sprayed on the surface of the sphere, and the coating is composed of nano zirconia and nano hydroxyapatite. The invention is applied to the field of artificial joints.

An independent arched high-low temperature connection structure with support, which is a left-right symmetrical structure, and the left and right structures are the same, including the main supporting beams, the secondary arc supporting beams, the secondary bottom supporting beams, Arched connecting beams, end support beams, outrigger side bolt feet for support beams, outrigger side bolt tables for support beams, and outboard side bolt feet for unsupported beams. The bolt feet on the outrigger side of the supporting beam and the bolt platform on the outrigger side of the supporting beam are located at the high temperature end, and the bolt feet on the outreaching side of the unsupported beam are located at the low temperature end. Among them, the secondary supporting beam transmits the load to the primary supporting beam; the arched connecting beam is the main part of the connection, and also the main transition part of the high temperature end and the low temperature end. The present invention adopts wedge-shaped bolt connection and installation, which can effectively reduce the hot-end structure connected with the connecting piece, such as a ceramic cover, and effectively reduce the thermal mismatch phenomenon between the structures. At the same time, the support structure of the secondary beam can be added to improve the ability of the connector to withstand external force loads, and the overall strength of the high and low temperature connection structure can be enhanced.

The invention relates to a method for preparing a C / C composite material surface ZrC coating. The method comprises the step (1) of preprocessing a C / C composite material;the step (2) of preparing an alloy raw material, and smelting the alloy raw material to obtain a Si-Zr alloy for liquid-phase reaction sintering; the step (3) of placing the liquid-phase reaction sintering alloy and the C / C composite material in a graphite crucible, and placing the graphite crucible in a high vacuum carbon tube sintering furnace; performing vacuumizing, and performing heating to a liquid-phase reaction sintering temperature for heat insulation; after the heat insulation is over, performing cooling and discharging out of the furnace, and obtaining the C / C composite material surface ZrC coating. The method is simple to operate, short in period and low in cost, the prepared ZrC coating and a base body are high in bonding strength, and the thermal cycle resistance and impact resistance properties are good.

The invention discloses a through wafer interconnect structure processing method comprising: 1. etching a blind hole on a substrate; 2. etching a pattern dielectric substance layer on the substrate; 3. etching the pattern dielectric substance layer and the dielectric material at the bottom of the blind hole, keeping the dielectric material of a blind hole side wall; forming a dielectric substancehole on the substrate; 4. depositing a layer of conductive material on the dielectric substance hole and forming a conductive hole; 5. re-depositing a layer of pattern dielectric substance on the conductive layer and filling the conductive hole; 6. etching the back side of the plate to expose the conductive layer and forming a solder micro-convex point on the conductive layer, wherein the patterndielectric substance material is preferable poly-p-xylene. The invention simplifies the process steps, reduces the process time and the cost; depresses a parasitic capacitance by using two layers of the pattern dielectric substance layers, improves a interconnect electrical behavior, suits for the high speed and RF three-dimensional interconnection structure; releases the thermal mismatch betweenthe conductive material and the silicon and greatly reduces the thermal mechanical stress.

The invention discloses a three-layer alumina-magnesium aluminate spinel insulation coat and a coating method thereof. The composite insulation coat has a three-layer structure, the first layer is a high-purity alumina coat (1), the second layer is an alumina-magnesium aluminate spinel mixed powder coat (2), the third layer is a metallic nickel tack coat (3), and the metallic nickel tack coat (3) is sprayed on the surface of a metal substrate (4) which is a sample piece through a plasma spraying device. The three-layer alumina-magnesium aluminate spinel insulation coat is obtained through granulating and coating through plasma spraying by treating high-purity alumina having an average particle size of 45mum and magnesium aluminate spinel powder having an average particle size of 40mum (and a purity of 99) as spray powder. The three-layer alumina-magnesium aluminate spinel insulation coat has the advantages of manure preparation technology, easily available spray powder, easy adjustment of the alumina and magnesium aluminate spinel components in the medium mixed layer, large thickness, good combination performances with the substrate, and the like, and can tolerate the instant 10kV high-voltage impact.

The invention provides a graphite base with a protective coating layer and a preparation method thereof. The invention prepares a silicon carbide coating layer on the surface of the porous graphite base through combining the in-situ chemical gas-phase reaction permeation and the chemical gas-phase deposition two-step method. The preparation method is carried out according to the following steps: placing the a base body of the graphite base in a reaction chamber, introducing SiCl4 gas and H2 gas into the reaction chamber according to the volume ratio that SiCl4 / H2 equals to 1 / 5 to 50 under thecondition of the reaction chamber temperature between 1300 and 1600 DEG C and the vacuum between 200 and 500 Pa, wherein the hydrogen flow rate is between 200 and 1000 ml / min, the gas introduction time is between 0.5 and 2 hours, and a primary SiC coating layer is permeated on the base body of the graphite base through the in-situ gas-phase reaction; and then b, introducing CH3SiCl3 gas and H2 gas into the reaction chamber according to the volume ratio that CH3SiCl3 / H2 equals to 1 / 5 to 100, controlling the hydrogen flow rate to be in a range between 200 and 1000 ml / m and the gas introduction time between 1 and 50 hours, and depositing a secondary SiC coating layer outside the surface of the primary SiC coating layer after schizolysis.

The invention relates to the technical field of cutting tools, in particular to a high-strength hole saw and a manufacturing method, which are composed of a cylindrical base and sawtooth, the sawtooth is composed of a sawtooth base, an adhesive layer and a reinforcement layer, the sawtooth base, adhesive The layer and the reinforcement layer are arranged from the inside out; the bonding layer is an MCrAlNbY alloy material, wherein M is Co, Ni or a combination of the two; by mass percentage, the MCrAlNbY alloy material is composed of the following elements: M: 38‑ 45%, Al: 9.5‑11%, Nb: 2‑4%, Y: 0.75‑0.1%, and the rest is Cr; the reinforcement layer is made of TiC x N (1‑x) and CoO 2 Composition, wherein, x is 0.35-0.7, the high-strength hole saw of the present invention has good mechanical properties, and the relevant mechanical properties have not been affected by the cold and hot cycle test, and the application prospect is broad.

The invention provides a method for infiltrating tungsten carbide on the surface of carbon material, which is characterized in that high temperature heat treatment is conducted to the carbon material on which a thinner tungsten coating layer is deposited; and the heat treatment process comprises the following steps: firstly carrying out heat preservation for a period of time at the lower temperature and then carrying out heat preservation for a period of time at the higher temperature again. After the completion of heat treatment, a thinner tungsten coating layer is deposited on the surface of the material again, and then the heat treatment in the identical process is conducted to the material again. The processes are performed for 3 to 5 times, namely the tungsten carbide can be infiltrated on the surface of the carbon material. The preparation of the tungsten carbide on the surface can preferably select the methods such as chemical gas phase deposition, physical gas phase depositionand after-glow plasma. The tungsten carbide is infiltrated on the surface of the carbon material by adopting the high temperature heat treatment method; a tungsten element is transited from the surface of the carbon material in a tapered manner from inside to outside, so that the thermal mismatching of the tungsten carbide and the carbon material is effectively relieved, and a coating layer and abase body are combined stably.

The invention discloses a carbon fiber reinforced ceramic matrix composite material and a preparation method thereof, belonging to the technical field of ceramic matrix composite materials; the composite material includes a carbon fiber layer containing a carbon interface phase, a SiC-ZrC matrix on the carbon fiber layer and a SiC The SiC layer on the surface of the ZrC substrate; the preparation method comprises: adopting chemical vapor deposition to deposit pyrolytic carbon in carbon fiber cloth to obtain a carbon fiber layer containing a carbon interface phase; then adopting chemical vapor deposition to deposit the carbon fiber layer on the obtained sample Alternately deposit SiC layers and ZrC layers to obtain a SiC-ZrC matrix, and then use chemical vapor deposition to deposit an SiC layer on the surface of the matrix to obtain the composite material; the carbon fiber reinforced ceramic matrix composite material provided by the invention has high density, and at the same time It has good anti-ablation performance and mechanical properties in low temperature environment, and has broad application prospects in ceramic composite components for high thrust ratio aero-engines.