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215results about How to "Short sintering time" patented technology

Repairing mass and preparation method thereof

ActiveCN101973775ASolve the problem of sinteringRelieve production pressureBrickMetallic aluminum
The invention relates to a repairing mass for repairing in the converter production process of steel making and vanadium extracting of steel enterprises, in particular to a repairing mass used for a converter lining made of magnesia carbon bricks and a preparation method thereof, and provides a repairing mass having the advantages of short sintering time and long service life for meeting the requirement of production. The repairing mass per 100 weight parts comprises the following raw materials in parts by weight: 48-60 parts of fused magnesia, 22-28 parts of magnesite clinker, 10-16 parts ofmodified asphalt, 1-5 parts of metallic aluminum powder, 1-4 parts of ferric oxide powder and 2-10 parts of adhesive. The preparation method of the repairing mass is simple and convenient, i.e. all the raw materials are mixed. In the fettling production process of the vanadium extracting converter, when a local breakage appears on the converter lining, the repairing mass is coated on the part to be repaired; the repairing mass is sintered by utilizing the wall temperature of the converter, and production by blending with iron can be carried out after sintering; and under the conditions of lowsmelting temperature (1,360-1,400 DEG C) of the vanadium extracting converter and shorter smelting period (5-10 minutes), the repairing mass still can be quickly sintered with a working lining to form an organic combination with higher strength so as to prolong the service life of the repairing mass.
Owner:攀枝花钢城集团瑞矿工业有限公司

High strength and toughness 3Y-TZP composite ceramic and preparation method thereof

The invention discloses a high strength and toughness 3Y-TZP composite ceramic and a preparation method thereof. The 3Y-TZP composite ceramic consists of 3Y-TZP, a SiC crystal whisker and Sr2Nb2O7; and the preparation method of the 3Y-TZP composite ceramic comprises the steps of preparing and mixing Sr2Nb2O7 powder, ball milling, profiling, degumming and sintering. The composite ceramic is obtained by sintering the SiC crystal whisker and a Sr2Nb2O7 ferroelectric material second-phase addictive which are introduced into the 3Y-TZP. The ceramic material with high strength and toughness can be obtained by adjusting the contents of the SiC crystal whisker and the Sr2Nb2O7 and optimizing a microwave sintering process under the synergistic effect of reinforcing by the SiC crystal whisker and toughening by the Sr2Nb2O7 piezoelectric second phase. The invention has reasonable components and simple preparation process and simultaneously achieves the effects of strengthening and toughening by adopting a synergistic technology of reinforcing by the SiC crystal whisker and toughening by the Sr2Nb2O7 piezoelectric second phase. In addition, the invention is applicable for industrial production, effectively improves the mechanical property of the 3Y-TZP ceramic and widens the application field of the 3Y-TZP ceramic.
Owner:CENT SOUTH UNIV

Preparation method of bismuth telluride based bulk nano crystalline thermoelectric material

The invention relates to a bismuth telluride based bulk nano crystalline thermoelectric material and preparation method thereof. The technical scheme includes that: firstly simple substance powder with mass percent more than 99.99% is taken as raw material, burdening is carried out according to the chemical formula (SbxBi1-x)2Te3 or Bi2(SeyTe1-y)3, wherein x is more than or equal to 0.75 and less than or equal to 0.85, y is more than or equal to 0.04 and less than or equal to 0.06, mixing to be uniform is carried out, and then ball milling is carried out by a ball mill, thus obtaining bismuth telluride base alloy nano powder; secondly, the bismuth telluride base alloy obtained in the first step is loaded into a graphite mould or ceramic mould to be sintered in a micro wave irradiation pressure sintering device; temperature rises to 300-550 DEG C by heating under the condition that the pressure applied to the powder is 10-40MPa, and then heat preservation is carried out for 10-60min under the condition that the pressure applied to the powder is 30-60MPa, thus obtaining the bismuth telluride based bulk nano crystalline thermoelectric material. The invention has the characteristics of less investment, low production cost, simple technology and short period; and the obtained bismuth telluride based bulk nano crystalline thermoelectric material has high performance.
Owner:WUHAN UNIV OF SCI & TECH

Method for preparing high-compact ITO target material through two-step sintering

ActiveCN106977179AShort sintering timeImprove micro-uniformityAir atmosphereUltimate tensile strength
The invention discloses a method for preparing a high-compact ITO target material through two-step sintering. The method comprises the following steps: firstly manufacturing the raw material into a biscuit, keeping warm and degreasing under the air atmosphere, directly placing under the air atmosphere to warm to 800-1300 DEG C after the degreasing and keeping warm for 5-30 hours to perform the first step of pre-sintering; placing the pre-sintered green body on a sintering bearing plate, warming to 1500-1600 DEG C and keeping warm for 5-30 hours under the oxygen atmosphere so as to perform the second step of sintering; stopping introducing the oxygen 1-5 hours before finishing the sintering; and performing furnace cooling to obtain an ITO target sintering body. The pre-sintering is performed under the air atmosphere so that the sintering time of the oxygen atmosphere can be shortened, the production energy consumption is greatly lowered; the degreasing and the pre-sintering process are integrated so that the sintering total time is saved; the pre-sintering enables the particles in the green body to be further homogenized, the abnormal crystal grain growth is avoided, and the microscopic homogeneity of the target is improved, and the strength and the thermal shock resistance are improved; the prepared ITO target density reaches to 7.128g/cu.cm and more.
Owner:725TH RES INST OF CHINA SHIPBUILDING INDAL CORP

Connecting method for sintering/welding titanium-steel dissimilar metal

ActiveCN103480846ALittle controllabilityEffective thickness controlWelding/soldering/cutting articlesWelding apparatusExpansion factorTitanium
The invention discloses a connecting method for sintering/welding titanium-steel dissimilar metal. The differences of physical properties of the titanium and the steel which are dissimilar metal are large, and the titanium and the steel are hard to connect through conventional methods. According to the connecting method, firstly, the titanium or titanium alloy, V-Cu gradient alloy powder C1, C2 and C3 and stainless steel are placed in a die one by one to be pressed in advance, and secondly, the die is placed in a sintering device to be sintered in a spark plasma mode, wherein the V-Cu gradient alloy powder C1, C2 and C3 are composed of mixed powder which is formed by mixing a plurality of kinds of metal powder according to different proportions, and the expansion factor gradient of the V-Cu gradient alloy powder C1, the expansion factor gradient of the V-Cu gradient alloy powder C2 and the expansion factor gradient of the V-Cu gradient alloy powder C3 are matched with one another. The titanium or the titanium alloy and the stainless steel are directly connected and formed at a time in a sintering mode, the method of spark plasma sintering is particularly suitable for sintering molding of V-Cu gradient connectors of the titanium and the stainless steel, and a titanium-steel dissimilar metal sintering/welding connector can have a high mechanical property.
Owner:NANJING UNIV OF SCI & TECH

Graded ordered porous TiAg alloy preparation method

The invention relates to a graded ordered porous TiAg alloy preparation method, which belongs to the technical field of biomedical material preparation. Flat shuttle Ti powder and the Ag powder are weighed according to the required proportion and are ball-milled to acquire composite powder. Acquired Ti-Ag composite powder is mechanically pressed into a center bar blank. The center bar blank and a fixator are combined and placed into a graphite mold, and the surrounding is filled with spherical Ti powder of the equal height. Punches are added to the mold up and down. Placing into a discharge plasma sintering furnace is carried out. The system is vacuumized to 2 to 6 Pa. According to a step heating method, the blank is heated to the first level graded temperature 600 to 800 DEG C at the heating rate of 80 DEG C/min, and then heat preservation is carried out for 3 to 5min; the blank is heated to the second level graded temperature 800 to 1000 DEG C at the heating rate of 50 to 80 DEG C/min, and then heat preservation is carried out for 10 to 15min; and demolding is carried out to acquire graded ordered porous TiAg alloy. The graded ordered porous TiAg alloy prepared by the method provided by the invention has the characteristics of good antibacterial property, biological activity and high strength, and is especially suitable for human body hard tissue defects in biomedical engineering, such as artificial joint, artificial bone, dental implant and the like.
Owner:KUNMING UNIV OF SCI & TECH

Method for preparing boron carbide ceramic material through low-temperature fast sintering

The invention provides a method for preparing a boron carbide ceramic material through low-temperature fast sintering. The method is characterized in comprising the following steps: a hard template is adopted as a structure-directing agent; porous boron carbide powder is synthesized with a nano-scale casting method; the porous boron carbide powder is added into a graphite mold, and the mold is placed into a chamber of a spark plasma sintering furnace; sintering is carried out under vacuum and in an inert or reductive atmosphere; after sintering, the product is cooled to room temperature with the furnace; and grinding is carried out, such that the boron carbide ceramic material is obtained. According to the low-temperature fast sintering boron carbide ceramic preparation method, the porous boron carbide powder is adopted as a sintering raw material. The porous boron carbide powder has the advantages of large specific surface area, high surface energy, good sintering activity, and the like, such that the powder is easier to be densified during sintering. Also, pressurization can be realized during a sintering process with a spark plasma sintering technology, such that pore collapse and densification of the porous boron carbide powder can be facilitated, and thus the boron carbide ceramic can be obtained under a relatively low temperature. The technology has advantages of fast temperature increasing speed, short sintering time, and the like. The method is an energy-saving and environment-friendly preparation method, and has good application prospect.
Owner:DONGHUA UNIV +1

Oscillating hot press sintering furnace

The invention provides an oscillating hot press sintering furnace and relates to the field of high-performance ceramic and powder metallurgy material preparation, in particular to equipment adopting the hot press sintering method. The oscillating hot press sintering furnace comprises a furnace body and a hydraulic mechanism. An upper water cooling pressure head, an upper graphite pressure head, a lower water cooling pressure head and a lower graphite pressure head are arranged inside the furnace body. The hydraulic mechanism comprises an upper oil press and a lower oil press. The upper oil press is connected with the upper water cooling pressure head. The lower oil press is connected with the lower water cooling pressure head. The top of the upper water cooling pressure head and the bottom of the lower water cooling pressure head are provided with electromagnetic resonance pressure applying devices correspondingly. The electromagnetic resonance pressure applying devices can adjust the vibration frequency, vibration amplitude and pressure while hot press sintering is conducted. According to the oscillating hot press sintering furnace provided by the invention, high-frequency vibration amplitude/pressure can be achieved through the bidirectional pressurizing mode, the sintering time is shortened, energy consumption is reduced, and the compactness of a product is more uniform; and in addition, system faults can be found in time, and safe production is guaranteed.
Owner:ZHUZHOU XINRONGLI IND

Method for preparing WC-Co hard alloy by rapid sintering under multi-physics coupling action

The invention discloses a method for preparing WC-Co hard alloy by rapid sintering under a multi-physics coupling action, which is characterized by comprising the steps of: evenly mixing powder of WC and Co, wherein the weight ratio of WC to Co is 84-94: 16-6; weighing and then filling into a mould; then, under the conditions that the heating speed is 15-100 DEG C/ s and the vacuum degree is less than or equal to 0.01Pa, electrifying the mould containing the WC-Co powder with alternating current for rapid heating, and applying 10-200MPa acting force to the two ends of the mould; under the continuous action of electric field and force field, carrying out instant electric heating impact for different times when temperature rises to 800-1000 DEG C; and finally, cutting off the power, cooling with air and taking out the product. The electric heating impact comprises the following steps: cooling from the sintering temperature to 400 DEG C at the cooling speed of 15-100 DEG C/ s and then heating to the sintering temperature at the heating speed of 15-100 DEG C/ s; wherein the circulation time(s) is/ are 1-10 time(s). The method simplifies the technological process, is rapid, efficient, energy-saving and environment-friendly, improves the quality of the hard alloy and is capable of replacing the existing preparation method of the hard alloy.
Owner:SICHUAN UNIV +1
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