39results about How to "Improve hot corrosion resistance" patented technology

The invention mainly relates to the coating technique, in particular to a gradient MCrAlY coating used for protecting high-temperature alloy and a preparation method thereof. The invention adopts a method combining the arc ion plating (AIP) co-deposition and the vacuum diffusion annealing to prepare an MCrAlY coating with the Al element concentration distributed along the depth direction in a gradient way. Compared with the existing conventional MCrAlY high-temperature protective coating, the gradient MCrAlY coating of the invention effectively increases the content of Al memory phase in the coating, so as to improve the high-temperature oxidization resistance and the heat corrosion resistance of the coating, and can effectively prolong the service life of the coating. The MCrAlY gradientcoating and the preparation method of the invention can be applied to the protection of Ni-based and Co-based high-temperature alloys.

The invention discloses a titanium alloy high-temperature oxidation-resistant fretting-wear-resistant coating material, a coating and a preparation method of the coating. The titanium alloy high-temperature oxidation-resistant fretting-wear-resistant coating material contains hexagonal boron nitride (h-BN), MCrAlYX alloy powder and a binding agent and is composed of 5-30% of hexagonal boron nitride, 0-5% of a binding agent and the balance of MCrAlYX, wherein M is Co, Ni, Fe or alloy thereof, and X is one or combination of more than one of alloy elements such as Ti, Hf, Ta, Nb, Re, Ti and Si. In the preparation method of the coating, high velocity oxy fuel spraying or atmospheric plasma spraying is adopted. The highest use temperature of the coating can reach 1100 DEG C, and the coating can be applied to protection for tenon-mortise structure connecting parts of titanium alloy and high-temperature alloy parts of a fan, a compressor blade, a turbine blade and the like of an aircraft engine, a ground combustion gas turbine and the like.

The invention mainly relates to the coating technique, in particular to a gradient MCrAlY coating used for protecting high-temperature alloy and a preparation method thereof. The invention prepares an MCrAlY composite gradient coating by adopting the method combining the arc ion plating (AIP) and the diffusion aluminizing. The thickness of an aluminum-rich layer on the surface of the MCrAlY composite coating can be controlled by setting the aluminizing temperature and the period of heat preservation and the Al elements are distributed in a gradient way along the depth direction; in addition, the chemical vapor deposition method used for the aluminizing has the advantages of good uniformity on the aluminum-rich layer and being not affected by the size and shape of a sample. Since the method of direct diffusion is adopted without introducing a weak interface, the MCrAlY high-temperature protective coating can increase the content of Al memory phase to the utmost extent under the condition that the mechanical property of the coating is guaranteed, so as to improve the high-temperature oxidization resistance and the heat corrosion resistance of the coating, and can effectively prolongthe service life of the coating. The MCrAlY composite gradient coating and the preparation method of the invention can be applied to the protection of Ni-based and Co-based high-temperature alloys.

The invention relates to high-temperature protective coating technology, in particular to an MCrAlY+AlSiY composite coating and a preparation technique thereof. A MCrAlY composite coating, which is rich in Al on an outer layer and rich in Cr on an inner layer and is distributed in a gradient form, is formed by depositing an AlSiY coating on a MCrAlY coating and by using a vacuum diffusion annealing method. The concentration of Al elements on the surface layer of the composite coating is 18 to 22 weight percent, and the concentration of Cr elements on the inner layer is 28 to 45 weight percent. The MCrAlY composite coating, which is rich in Al on the outer layer and rich in Cr on the inner layer and is distributed in a gradient form, is prepared by combination of arc ion plating depositionand the vacuum diffusion annealing. Compared with the existing conventional MCrAlY high-temperature protective coating, the MCrAlY+AlSiY composite coating of the invention effectively improves an A1 storage phase content and Si content in the surface layer of the coating; and the layer rich in Cr is formed on the inner layer of the coating, so the high temperature oxidation resistance and hot-corrosion resistance of the coating are improved, and the service life of the coating can be effectively prolonged. The composite coating and a preparation method thereof are suitable for protecting Ni-based high-temperature alloys.

The invention provides a titanium alloy blade protective coating and a preparation method thereof. The MCrAlY+AlSiY composite coating arranged on a titanium alloy substrate is adopted. The MCrAlY layer is deposited on the surface of the titanium alloy substrate by an arc ion plating process, and the AlSiY layer is ionized by The assisted arc ion plating process is deposited on the MCrAlY layer. By adopting the scheme of the present invention, the obtained protective coating has high bonding strength with the titanium alloy blade substrate, the surface of the protective coating and its interior have no large particle size and number, no micropores, and the coating has excellent compactness, which can not only improve the titanium alloy The high temperature oxidation resistance and thermal corrosion resistance of the alloy blade protective coating are especially suitable for high temperature protection in hot and humid salt spray environment (such as marine service environment), and can effectively prolong the service life of the titanium alloy blade protective coating.

A molybdenum-cobalt-based superalloy and its application belong to the field of alloys. The molybdenum-cobalt-based superalloy is composed of Mo, Co, Ni, Al and Ti elements, and the atomic percentage of Mo is (1-2) at.%, Ni is (24-34) at.%, Al is (6.5-8.5) at.%, Ti is (1.5-3.5) at.%, and the balance is Co; the sum of the atomic percentages of Al and Ti is not more than 10 at.%, the sum of the atomic percentages of Mo, Co, Ni, Al and Ti is 100 at.%. The cobalt-based high-temperature alloy containing molybdenum element of the present invention has excellent high-temperature corrosion resistance and tensile strength, and the alloy of the present invention is applied to high-temperature component materials for aerospace engine manufacturing, industrial gas turbine manufacturing, and heat exchanger manufacturing.

The invention belongs to the field of refractory matters, and in particular relates to a composite magnesia carbon brick and a preparation method thereof. The composite magnesia carbon brick comprises the following raw materials in percentage by weight: 40-50% of regenerated magnesia carbon bricks, 25-40% of fused magnesite, 3-6% of Bonite fine powder, 0.5-2% of metallic aluminum fibers, 2-5% of magnesium-forsterite synthetic sand fine powder, 0.5-1% of asphalt powder, 1-5% of an anti-oxidation additive, 1-10% of graphite and 1-8% of fused quartz, wherein an external binding agent accounts for 2.8-3% of the total weight of the raw materials. The composite magnesia carbon brick is good in high temperature resistance and corrosion resistance, and is relatively good in thermal shock resistance.

The invention relates to a high-temperature-resistant alloy casting and a preparation method thereof. The alloy casting comprises the following chemical components by mass percent: 0.10% to 0.18% of C, 2.0% to 2.6% of Si, less than or equal to 1% of Mn, less than or equal to 0.045% of P, less than or equal to 0.045% of S, 19% to 23% of Cr, 36% to 40% of Ni, 1.5% to 2.0% of Mo, 0.50% to 0.65% of B, 3.5% to 4.5% of W, 1.0% to 1.4% of Al, 2.0% to 2.6% of Ti, 2% to 3% of Co, 0.05% to 0.15% of Ce and the balance of Fe. The preparation method comprises the following steps of the preparation of a wax mould; the preparation of a mould shell; smelting; and pouring. The as-cast hardness of the alloy casting is HB273-285; and an as-cast metallographic structure of the alloy casting is composed of a fine and small dendritic austenite r, a precipitation strengthening phase r', an intermetallic compound, a metal carbide and a metal boride. The obtained inner core cup casting is strong in high-temperature creep resistance, high-temperature resistance and oxidation resistance and is high in strength and stability under a high-temperature condition, so that the long service life of the casting is realized.

The invention provides a 1050°C-resistant supercharger nozzle ring blade nickel-based alloy material and a manufacturing method thereof, including C, Mn, Si, S, P, Cr, Fe, Al, Ti, B, Co, Cu, Nb and Ni; based on the mass of the nickel-based alloy material of the blade, the content of C is 0.5-1.0%, the content of Mn is 1.00%, the content of Si is 1.00%, and the content of S is 0.015%. , the P content is 0.02%, the Cr content is 18.0-21.0%, the Fe content is 1.00%, the Al content is 1.5-2.5%, the Ti content is 1.0-2.0%, and the Co The content is 5.0-8.0%, the Cu content is 0.20%, the Nb content is 1.5-2.5%, and the balance is Ni. The VGT blade of the present invention has reduced processing difficulty. After 400h exhaust temperature of 980°C engine reliability test, the blade is intact without deformation after the test, the thickness of the blade oxide layer is less than 10 μm, the increase of the shaft hole matching clearance is less than 100 μm, and the blade shaft and the mounting plate The amount of wear of the shaft hole is within an acceptable range.

A chromium-cobalt-based superalloy and its application, belonging to the field of alloys, the chromium-cobalt-based superalloy is composed of Cr, Co, Ni, Al and Ti elements, and the atomic percentage of Cr is (1-2) at.%, Ni is (24-34) at.%, Al is (6.5-8.5) at.%, Ti is (1.5-3.5) at.%, and the balance is Co; the sum of the atomic percentages of Al and Ti is not more than 10 at.%, the sum of the atomic percentages of Cr, Co, Ni, Al and Ti is 100 at.%. The cobalt-based high-temperature alloy containing chromium element of the present invention has excellent high-temperature corrosion resistance and tensile performance, and the alloy of the present invention is applied to high-temperature component materials for aerospace engine manufacturing, industrial gas turbine manufacturing, and heat exchanger manufacturing.

The invention discloses a high-entropy high-temperature alloy and a preparation method thereof, and belongs to the field of high-entropy alloys. The alloy comprises the following chemical components of, in percentage by atom, 35%-40% of Ni, 30%-35% of Co, 10%-13% of Al, 5%-10% of Cr, 5%-8.5% of Fe, 1%-2.5% of Ti, 1%-3% of Ta, 0.01%-1% of Mo, 0.01%-1% of W, 0-1% of Re, 0.02%-0.12 % of C, 0.002%-0.015% of B, 0.005%-0.12% of Hf, and 0.05%-0.15% of RE, wherein Al+Ti+Ta is greater than or equal to 14% and less than or equal to 16%, and RE is any one rare earth element of Ce, La and Y. The preparation process of the alloy comprises the following steps of weighing and matching alloy elements according to the molar ratio, putting the alloy elements into a smelting furnace for smelting, carrying out high-temperature refining and casting to obtain an alloy ingot, preparing a (001) oriented single crystal high-entropy high-temperature alloy bar by adopting a high-speed solidification Bridgeman method, and then performing solution treatment and secondary aging treatment on the alloy bar. The prepared alloy bar has good high-temperature strength and thermal corrosion resistance, and is a candidate material of a hot-end part of an aero-engine and an industrial gas turbine.

The invention discloses a nickel-based high temperature alloy and a manufacturing method thereof. The nickel-based high temperature alloy comprises the following components in percentage by weight: 0.06-0.15% of C, 0.25-0.55% of Si, 0.40-0.95% of Mn, 0.05-3.00% of Fe, 1.0-5.0% of Co, 0.05-0.50% of Al, 0.01-0.09% of Ti, 20.0-24.0% of Cr, 0.01-0.40% of Nb, 0.90-3.0% of Mo, 12.0-15.0% of W, 0.10-1.0% of Re, 0.001-0.009% of B, 0.8-2.0% of Ce, 0.8-1.8% of Ru, 0.3-3.0% of Hf, 2.0-5.0% of Ta, 0.05-0.35% of V and the balance of nickel and inevitable impurities. The nickel-based high temperature alloy disclosed by the invention has the advantages that materials are prepared in a certain proportion, homogenization treatment is carried out on the alloy for three times, high temperature forging is carried out on the alloy, and solution treatment, heat preservation and cooling are carried out; and by adopting the technical scheme of the invention, the strength, fatigue resistance and corrosion resistance of the alloy at high temperature can be effectively improved.

The invention relates to a NiCrAIY coating for nickel base high temperature alloy. The NiCrAIY coating for the nickel base high temperature alloy is characterized by comprising the following components by weight: 8-25 percent of Cr, 30-40 percent of Al and 0.3-1.5 percent of Y. The NiCrAIY coating and the preparation method thereof can effectively prolong the service life of high temperature alloy components. The inoxidizability of a matrix can be effectively improved under the environment with the temperature below 1100 DEG C; and the hot corrosion resistance of the matrix can be improved under the Cl-containing hot corrosion environment with the temperature below 900 DEG C. The equipment investment and the production cost of the thermal diffusion preparation method are far lower than the existing methods such as thermal spraying, vacuum physical vapor deposition, and the like. Therefore, the NiCrAIY coating and the preparation method thereof have foreseeable tremendous economic value and social value.

The present invention discloses a titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating; an Al-rich deposition layer, an Al-Cr alloy layer and a Cr diffusion layer are successively arranged from surface to a titanium aluminum alloy substrate. The content of Al in the Al-rich deposition layer remains the same. The content of Al in the Al-Cr alloy layer gradually reduces outside-to-inside to 70%-100% of the content of Al in the titanium aluminum alloy substrate, and the rest in the Al-Cr alloy layer is Cr. The contents of Cr and Al in the Cr diffusion layer respectively gradually reduces outside-to-inside to same as the contents of Cr and Al in the titanium aluminum alloy substrate, and the rest in the Cr diffusion layer is other elements in the titanium aluminum alloy substrate, and the contents of other elements in the Cr diffusion layer respectively gradually rise to same as the contents of the other elements in the titanium aluminum alloy substrate from zero. The invention also discloses a preparation method of the titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating; the titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating can give titanium aluminum alloy excellent oxidation resistance and heat resistance corrosion performance under high temperature and long term service conditions, and due to the presence of the diffusion layer of the gradient components, the reliable binding strength and excellent thermal shock resistance can be realized.