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2620results about How to "Improve fracture toughness" patented technology

Coating inorganic fiber toughened MAX phase ceramic composite material, preparation method and uses thereof

ActiveCN103910532AAppropriate bonding interface strengthFree control of interface strengthNuclear energy generationContainmentAviationFiber
The present invention provides a coating inorganic fiber toughened MAX phase ceramic composite material and a preparation method thereof. The composite material adopts a MAX phase ceramic material as a matrix and adopts coating inorganic fibers as a toughening phase, wherein the coating inorganic fiber content is 0.5-90% (by volume), and the coating inorganic fibers are completely dispersed in the matrix and are inorganic fibers with the surface coated with the coating. Compared with the composite material in the prior art, the composite material of the present invention has the following characteristics that: the interface reaction between the inorganic fibers and the MAX phase ceramic can be effectively inhibited, the thermal expansion coefficient and elasticity modulus matching degree between the inorganic fibers and the MAX phase ceramic can be effective regulated, the effective improvement of the fracture toughness and the high temperature resistance of the MAX phase ceramic composite material can be achieved, the problems of high brittleness and insufficient use reliability of the MAX phase ceramic can be fundamentally solved, and the coating inorganic fiber toughened MAX phase ceramic composite material has potential application prospects in the high technology fields of civil use, aviation, aerospace, nuclear industry and the like, and is especially for the fission and fusion reactor nuclear power plant inner wall structure material.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

Nano-material-containing high-strength high-heat insulation exterior wall inorganic heat-retaining face brick

The invention belongs to the field of building materials, relates to a use of a nano-material in a building exterior wall heat-retaining system and provides a nano-material-containing high-strength high-heat insulation exterior wall inorganic heat-retaining face brick. The nano-material-containing high-strength high-heat insulation exterior wall inorganic heat-retaining face brick is characterized in that nano-particles are used so that compressive strength, tensile strength and bonding strength are improved. The nano-material-containing high-strength high-heat insulation exterior wall inorganic heat-retaining face brick is prepared by adding a nano-material having a nanoscale particle size into a mixed system of cement, an auxiliary gel material, a polymer binder, an inorganic light heat-retaining material, fibers and water, uniformly mixing, carrying out pressing molding of the mixture, carrying out organic polymer crosslinking and cement hydration drying, and carrying out waterproof layer coating. The nano-material-containing high-strength high-heat insulation exterior wall inorganic heat-retaining face brick has the advantages of excellent flame resistance, high compressive strength, high tensile strength, high bonding strength and good insulation effects.
Owner:平湖市法而特建筑保温科技有限公司

Process for producing composite material of Ti3SiC2 modified C/SiC

The invention discloses a method for preparing Ti3SiC2 modified C / SiC composite material, comprising the following steps: firstly, carrying out ultrasonic cleaning and drying on the pre-prepared body to be modified; compounding the size with distilled water, cellulose sodium carboxy methyl and TiC powder; then carrying out vacuum infiltration combined with pressure infiltration on the pre-prepared body and refrigeration and drying in vacuum; coating industrial silicon powder on the surface of the pre-prepared body; calcining the pre-prepared body in a vacuum furnace to lead the silicon to fuse to penetrate into the pre-prepared body; and cooling the pre-prepared body gradually to room temperature after full reaction in the vacuum furnace. As SI method is adopted to lead C / C or C / SiC composite material to be firstly internally filled with TiC granules, then MI method is adopted to penetrate silicon fusant, and TiC reacts with Si to generate Ti3SiC2 and SiC, the content of residue Si in the composite material is reduced, and the Ti3SiC2 phase in-situ generated in the C / SiC composite material causes the use temperature of the modified C / SiC composite material to rise from 1420 DEG C in the prior art to 1500-2300 DEG C and the fracture toughness property to rise from 8MPa.m in the prior art to 9-16 MPa.m.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Friction stir welding apparatus and associated thermal management systems and methods

The present invention provides a friction stir welding apparatus and associated thermal management systems and methods for joining one or more similar or dissimilar materials forming a workpiece along a joint to be welded. The friction stir welding apparatus includes a pin tool apparatus selectively disposed adjacent to and in direct contact with a first surface of the workpiece along the joint to be welded and a heating member disposed adjacent to a second surface of the workpiece along the joint to be welded, the heating member operable for controllably heating at least a portion of the workpiece adjacent to the joint to be welded. The friction stir welding apparatus also includes an annular spindle having an interior portion and an axis, the interior portion of the annular spindle at least partially defining one or more cooling channels, the one or more cooling channels operable for containing a cooling fluid. The friction stir welding apparatus further includes a shoulder disposed adjacent to the annular spindle and substantially aligned with the axis of the annular spindle and a pin tool disposed adjacent to the shoulder and substantially aligned with the axis of the annular spindle. The cooling fluid is operable for cooling at least one of the shoulder and the pin tool.
Owner:GENERAL ELECTRIC CO

High strength bainitic steel rail and heat treatment process thereof

The invention provides a high strength bainitic steel rail and a heat treatment process thereof. The steel rail comprises the following chemical compositions by weight percentage: 0.10%-0.32% of C, 0.80%-2.00% of Si, 0.80%-2.80% of Mn, Cr less than 1.50%, 0.10%-0.40% of Mo, 0-0.5% of Ni, wherein Mn, Cr and Ni satisfy the relation of: Mn+Cr+0.5Ni<=2.8%, and the balance of Fe and unavoidable impurities. The process is as below: conducting hot rolling on the steel rail or air cooling on the steel rail to room temperature, then reheating to 850-1000 DEG C for austenization; cooling the steel rail head to 620-570 DEG C with a cooling rate of 0.3-15 DEG C / s; when the temperature is lower than 620-570 DEG C, cooling to 350-200 DEG C with a cooling rate of 0.5-5 DEG C / s; and then conducting air cooling to room temperature. The invention avoids generation of excessive unstable thick M-A islands in granular bainite during air cooling to room temperature in hot rolling, reduces the risk of straightening fracture (or delayed fracture)of hot-rolled steel rail, and improves the adaptability of steel production process. The steel rail has tensile strength higher than 1400MPa, and realizes optimum matching of strength, toughness and ductility, and excellent rolling contact fatigue resistance and wear resistance.
Owner:ANGANG STEEL CO LTD

Flying shear blade and preparation method thereof

The present invention discloses a flying shear blade. The component has the weight percentage that C is 0.40-0.70, Si is 0.50-1.20, Mn is 0.20-0.50, Cr is 4.00-6.00, Mo is 0.50-2.00, V is 0.30-1.50, P is less than or equal to 0.02, S is less than or equal to 0.02, and Fe and inevitable impurity are the residual. The present invention provides a manufacture method of electric furnace smelting, and ingot casting; hydrogen removing and annealing treatment, and forging; preliminary heat treatment, rough machining, quenching and tempering heat treatment (primary quenching and high temperature tempering), semi finishing, ultimate heat treatment (secondary quenching, primary low temperature tempering, and secondary low temperature tempering), and fine finishing. By effectively controlling the material texture and the morphology, the quantity, the size and the distribution of carbonide, the quenching temperature and the tempering temperature of the quenching and tempering heat treatment, and the quenching temperature and the tempering temperature of the ultimate heat treatment are controlled, the texture crystal grains are more refined, the carbonide is distributed in a dispersed way, and simultaneously, the thermal stability and the retentivity are remarkably enhanced, thereby being advantageous for improving the operational performance of the blade.
Owner:BAOSHAN IRON & STEEL CO LTD +1
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