48results about How to "Strong resistance to high temperature oxidation" patented technology

The invention discloses a preparation method of anti-high-temperature-oxidation crystal whisker modified Ti(C,N) base composite metal ceramic, and belongs to the field of high-speed cutter materials. The preparation method of the crystal whisker modified Ti(C,N) base composite metal ceramic comprises the steps of raw material matching, ball milling and material mixing, material drying, vacuum hot pressed sintering and the like. The crystal whisker modified Ti(C,N) base composite metal ceramic comprises, by weight, 45-60% of Ti(C<0.5>N<0.5>), 10-25% f Al2O3 crystal whisker or ZrO2 crystal whisker, 8-15% of WC, 5-10% of Co, 5-10% of Mo2C and 5-10% of Ni. The Ti(C,N) base composite metal ceramic obtained through the preparation method has excellent compactness, high-strength toughness and high temperature oxidation resistance, and can serve as a (semi) precision-machined cutter material of a special steel material.

The invention discloses a 0Cr18Ni10Ti small-diameter seamless stainless steel capillary tube. The 0Cr18Ni10Ti small-diameter seamless stainless steel capillary tube comprises the following chemical components in percentage by mass: 0.029-0.031% of C, 0.55-0.59% of Si, 1.12-1.14% of Mn, 0.001-0.003% of S, 0.015-0.017% of P, 17.55-17.75% of Cr, 10.15-10.25% of Ni, 0.33-0.35% of Nb, 0.022-0.024% of Mo, 0.04-0.06% of N, 0.149-0.151% of Ti, 0.0013-0.0015% of Sb, 0.0007-0.0009% of Pb, 0.0012-0.0014% of Ce, 0.08-0.12% of rare earth elements and the balance of Fe and unavoidable impurities. The invention further discloses a production process of the 0Cr18Ni10Ti small-diameter seamless stainless steel capillary tube. The 0Cr18Ni10Ti small-diameter seamless stainless steel capillary tube has good flexibility, corrosion resistance, high temperature resistance, wear resistance, tensile strength and water resistance and also has excellent electromagnetic shielding performance.

The invention discloses a method for preparing a protective coating material of a boiler tube. The coating material consists of the following components in percentage by weight: 12 to 14 percent of Cr, 0.4 to 0.6 percent of Mn, 2 to 3 percent of Ti, 3 to 5 percent of Al, 2 to 4 percent of Si, 1 to 2 percent of Nb, 8 to 12 percent of Fe, 1 to 3 percent of Co, 3 to 5 percent of Mo, less than or equal to 0.025 percent of S, less than or equal to 0.035 percent of P and the balance of Ni. The method for preparing the protective coating material comprises the following steps of: 1) smelting waste steel, intermediate alloy and nickel ingots according to the components and refining to prepare coating material alloy ingots; 2) placing the prepared alloy ingots in a crucible for prepare powder through atomization, heating and melting, and atomizing to prepare powder by taking helium as atomization gas; and 3) screening the prepared atomization powder to obtain the coating powder with the diameter of -200 meshes.

The invention belongs to the technical field of high-temperature coatings and particularly relates to an aluminizing agent and method for preparing a Si-B-Y coating on the surface of tantalum and tantalum alloy. The aluminizing agent disclosed by the invention comprises, by weight, 12%-17% of aluminized element Si (with the purity greater than or equal to 99%), 1.0%-2.0% of aluminized element Y2O3 (with the purity greater than or equal to 99%), 1.0%-2.0% of aluminized element B (with the purity greater than or equal to 98%), 5%-8% of catalyst NaF (analytically pure), and the balance fillers Al2O3. The invention further discloses the preparation method of the coating. The preparation method comprises the steps of (1) conducting surface pretreating on a sample; (2) conducting ball milling and refining on the prepared aluminizing agent; (3) putting the sample and the aluminizing agent into an aluminizing tank and sealing the aluminizing tank; (4) conducting heating, heat preservation and cooling on the aluminizing tank put in a high-temperature furnace; and (5) finally, taking out the sample and then cleaning and drying the sample. The obtained coating is uniform and compact in structure, can be well bonded to a matrix and can remarkably improve the thermal protection properties of matrix alloy and resist the high temperature of 1000 DEG C for 100 h or more, and the thermal protection properties mainly include the high-temperature antioxidation property, the anti-corrosion property and the anti-wear property. Equipment required by the method is simple, and the method is reliable in process, low in cost and suitable for production and application.

The invention discloses a high-temperature-oxidation-resisting alloy steel and a preparation method thereof. The alloy steel is composed of the raw materials of, by mass, 39.0-41.5% of Q235 waste steel, 25.0-28.0% of stainless steel scrap, 14.0-16.0% of Ni-based alloy scrap, 2.0-2.2% of manganese iron, 8.0-8.5% of high-carbon ferrochrome, 4.5-4.8% of metal aluminum, 1.0-1.2% of ferrosilicon, 1.0-1.2% of ferrotungsten, 0.8-1.0% of yttrium-based heavy rare earth silicon-iron-magnesium alloy, and 0.30-0.45% of silicon-calcium alloy. The alloy steel is processed through electric furnace smelting, casting forming, and 600-650 DEG C heat treatment, and is provided with excellent antioxidant performance.

The invention relates to a novel preparation process for a thermal barrier coating. The novel preparation process comprises the following steps: generating a metal bonding bottom layer on the surfaceof a matrix; generating an in-situ thermal growth oxide layer (TGO); and generating a ceramic heat-insulating surface layer, wherein the TGO layer is pre-grown before the matrix serves. The TGO layercomprises alpha-aluminum oxide. A compact and continuous TGO layer which takes alpha-aluminum oxide as the principal component is preset through large-particle dry ice jetting and purifying rougheningtreatment and pre-vacuum argon gas oxidizing treatment. An oxide film has very good high-temperature oxidization resistance, prevents quick oxidization, reduces a layer thickness increase rate of theTGO layer, and achieves the purpose of reducing thermal barrier coating peel-off probability.

The invention discloses an antioxidant and long-life heat absorption and storage integrated corundum-mullite ceramic and a preparation method thereof. The ceramic is prepared from the following raw materials and modifiers in percentage by mass: 65-75 wt% of aluminum oxide, 15-20 wt% of Suzhou clay, 3-5 wt% of titanium oxide, 3-6 wt% of molybdenum oxide, 5-7 wt% of iron oxide and 2-3 wt% of nickel oxide. The ceramic prepared by the invention has excellent heat storage capacity, excellent heat storage and heat absorption capacity, high-temperature oxidation resistance, high breaking strength, good mechanical property and thermal shock resistant cycle stability, and longer service life.

The invention belongs to the technical field of surface protection, and discloses a TiB2-based coating with a multicycle structure and a preparation method thereof. The TiB2-based coating is formed bysputtering deposition on a substrate by taking a TiB2 target and a metal target as raw materials and adopting magnetron sputtering coating; and the TiB2-based coating is of a multicycle structure inwhich a TiB2 layer and an elemental metal layer are overlapped with each other, the adjacent TiB2 layer and the elemental metal layer are in a large period, meanwhile, periodic structures exist in theTiB2 layer and the elemental metal layer respectively, the period in the TiB2 layer is formed by alternately overlapping a TiB2-rich layer and a TiB2-poor layer, and the period in the elemental metallayer is formed by alternately overlapping a metal-rich layer and a metal-poor layer. The coating not only reduces the residual stress, but also integrates the characteristics of high hardness, highstrength, high high-temperature oxidation resistance and good bonding force of the single-layer TiB2, and is used for protecting the surfaces of products such as mechanical parts and knife molds.

The invention provides a hardfacing alloy containing silicon and chromium composite ceramic phases and a manufacturing process thereof. The hardfacing alloy is characterized that ingredients of the hardfacing alloy comprises 10-20 percent of chromium, 0.5-5 percent of silicon, 1-4 percent of nickel, 5-10 percent of carbon, balance ferrum and inevitable impurities. The manufacturing process of the hardfacing alloy includes the first step of carrying out calculation and mechanical mixing on ferrochromium powder, molybdenum powder, nickel powder, graphite and reduced iron powder according to element mass percent, mixing all the powder evenly in a dry-type ball milling mode through a ball grinding mill to enable the granularity of the powder to reach 60-160 meshes, and taking out the powder, the second step of drying the powder in a drying oven for one to two hours and then enabling the temperature in the oven to cool down to the indoor temperature, and the third step of adding the powder into a powder feeder and then carrying out plasma arc surfacing on the powder to form a hardfacing layer. The manufacturing process is easy to operate, the kinds of the additive alloys are fewer, and the obtained hardfacing alloy is low in cost, good in binding performance between the hardfacing layer hard phases and base materials and not prone to falling off, and has the advantages of high hardness, high abrasion resistance and high temperature oxidation resistance.

The invention provides a novel aluminum heating ring and a manufacturing method thereof. The novel aluminum heating ring comprises a heating tube and two semicircular annular heating rings, wherein each semicircular annular heating ring comprises an outer ring, an inner ring and a heat conduction ring; the outer ring, the inner ring and the heat conduction ring are all made of aluminum calenderedplates, and a groove is formed in the inner side surface of the outer ring; the heating tube is arranged in the groove; the heat conduction rings are distributed in a spaced mode along the circumferential direction of the inner ring; lugs are arranged on the circumferential end face of the outer ring; fastening holes are formed in the lugs; and an aluminum brazing layer is arranged between the outer side of the heat conduction ring and the inner side of the inner ring, between the outer side of the inner ring and the inner side of the outer ring, and between the heating tube and the groove. The manufacturing method comprises the following steps of manufacturing the outer rings, the inner rings and the heat conduction rings, preparing a brazing flux solution and a brazing flux material mixture, coating the brazing flux material, and carrying out assembling, brazing, appearance processing, and wiring end assembling or welding. The invention aims to provide the novel aluminum heating ringwith high heat conduction efficiency, no pollution in the manufacturing process, simplicity in manufacturing and low cost, and the manufacturing method of the novel aluminum heating ring.

The invention discloses a thermal spraying high temperature resistant oxidation coating for a gasifier burner. The thermal spraying high temperature resistant oxidation coating structurally includes abonding layer and a working layer, the bonding layer is placed at the bottom end of the working layer, the bonding layer is a NiCrAlY bonding layer, the working layer is an Al2O3 working layer, the coating thickness of the bonding layer is 50 [mu]m to 150 [mu]m , and the coating thickness of the working layer is 200 [mu]m to 400 [mu]m . The high temperature resistant oxidation performance of thecoating can be significantly improved, and the service range of the coating is expanded.

The invention relates to a method for preparing a Si-Al-Y composite infiltrated layer on the surface of Ti2AlNb alloy by a two-step method. The method comprises the following steps: arranging Si-Y2O3 on the surface of Ti2AlNb-based alloy in a pack infiltration manner; and then carrying out Al pack cementation to prepare a high-temperature-resistant oxidized infiltrated layer with certain Si, Al and Y contents on the surface. A one-step Si-Al-Y infiltration process is divided into two steps or multiple steps, and although a preparation process of the infiltrated layer is slightly complicated, element infiltration procedures can be adjusted flexibly according to characteristics of various elements about to be infiltrated. In every procedure, process parameters such as the type, the temperature and the time of a catalyst can be selected in a targeted manner according to physical and chemical properties of the infiltrated elements, and therefore, the infiltrated layer with a designed structure can be easily obtained.

The invention relates to a surface treatment technology, in particular to a metal nano composite electroplating technology. The invention discloses a metal nano electroplating technology, comprising an electroplating device and an electroplating formula; the electroplating device comprises hard particles, an electroplating bath, a liquid storage tank, a pump, a spray head and a core model, wherein the core model is arranged inside the electroplating bath, the upper part of the core model is provided with the spray head, an opening is formed at the lower part of the electroplating bath, electroplating liquid and the hard particles are sucked out from the liquid storage tank and conveyed to the spray head by the pump, and the electroplating liquid and the hard particles are rushed downwards from the upper part of the core model; and the formula of the electroplating liquid is as follows: 200-300 g/l of nickel sulfate, 30-43 g/l of nickel chloride, 20-40 g/l of boric acid, 0.05-0.09 g/l of lauryl sodium sulfate, and 4 * 10<-5> to 5 * 10<-5> mol/l of silver nanoparticles. Through the utilization of the metal nano composite electroplating technology disclosed by the invention, excellent electroplated layer can be prepared in an efficient and energy-saving manner. Through the motion of the hard particles, the dispersed state of the nanoparticles in the electroplating liquid is further improved, so that the nanoparticles are distributed in the electroplating liquid more uniformly.