33results about How to "Improve resistance to high temperature oxidation" patented technology

The invention provides a method for preparing a hollow blade inner chamber diffusion layer with high temperature resistance, oxidation resistance and corrosion resistance, which is characterized by comprising the following steps: preparing a nickel chromium osmolyte and a chromium aluminum osmolyte; calcining the prepared nickel chromium osmolyte at the temperature of 1000-1050 DEG C for 1-2 hours, then sieving by a 60 meshes sieve, filling in a seal container for next application; then calcining the prepared chromium aluminum osmolyte at the temperature of 1100-1150 DEG C for 1-2 hours and calcining at the temperature of 950-1000 DEG C for 1-2 hours, then sieving by the 60 meshes sieve, filling in the seal container for next application; then preparing the hollow blade diffusion layer, raising the work temperature of the nickel base high temperature alloy blade from 900 DEG C to 1050-1100 DEG C, simultaneously preparing the diffusion layer both in the inner chamber and on the external surface of the blade. The high temperature resistance, oxidation resistance and corrosion resistance capabilities of the blade can be substantially enhanced.

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 provides a novel nickel alloy. The novel nickel alloy comprises the following components in percentage by weight: 0.001-0.002% of Mg, 0.12-0.14% of Mn, 0.45-0.85% of W, 0.013-0.019% of Co, 0.12-0.18% of Nb, 0.89-0.95% of Sn, 1.3-1.9% of Mo, 1.2-2.4% of Zn, 1.5-2.8% of Ti, 0.51-0.71% of Fe, 1.7-1.9% of Y, 0.73-0.93% of Er, 0.007-0.011% of Sb, 37-45% of Cu and the rest of Ni. The nickel alloy is high-temperature resistant, high in corrosion resistance, low in manufacture cost and high in quality; the service life is greatly prolonged.

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 provides a tough high-temperature-oxidation-resistant molybdenum alloy and a preparation method thereof. The molybdenum alloy is composed of molybdenum, silicon, boron and zirconium, andthe molybdenum alloy comprises, by mass percentage, 2.2%-4% of silicon, 0.8%-1% of boron, 0.8%-1% of zirconium and the balance molybdenum. According to the preparation method, a solid-solid mixing mode is adopted for material mixing, pre-alloyed powder with uniform particles is prepared through mechanical ball milling or high-energy ball milling, the alloyed ball-milled powder is sintered to obtain a molybdenum alloy material, and then embedding siliconizing treatment is carried out to obtain the tough and antioxidant molybdenum alloy. The molybdenum alloy prepared through the method has goodcompactness, high toughness and high-temperature oxidation resistance, and thus the molybdenum alloy has wide application prospects and popularization value.

The invention provides a turbine blade assembly thermal barrier coating. The turbine blade assembly thermal barrier coating comprises a bonding layer, an aluminide layer, an aluminum oxide layer and a ceramic layer which are sequentially arranged in an upward mode from a turbine blade assembly base material or comprises an aluminide layer, a bonding layer, an aluminum oxide layer and a ceramic layer which are sequentially arranged. The bonding layer is a MCrAlY layer, and M represents one or two or three sorts of nickel, cobalt and iron. According to the thermal barrier coating system provided by the invention, the high-temperature oxidation resistance, thermal corrosion resistance and endurance property of the thermal barrier coating are improved on the premise that the thermal barrier effect of the thermal barrier coating is guaranteed, and thus the service life of a turbine blade assembly is prolonged. By means of the thermal barrier coating system prepared through the method, the weight of the blade assembly can be lowered obviously, and therefore the creep degree of the assembly by tension of the turbine blade assembly in the high-speed rotating process is decreased and the service life of the turbine blade assembly is prolonged.

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.

The invention relates to a surface treatment method for an aluminum electrolyzing inert anode. The surface treatment method is characterized by comprising the following steps: firstly, forming a protective layer on the surface of a Ni-Fe-based inert anode through spray coating, wherein the protective layer consists of a bottom layer Fe-Ni-X1 alloy layer and an outer layer Fe-Ni-X2-O ceramic-metal layer; secondly, sealing holes of the protective layer through a high-temperature oxidation method to form a uniform and compact oxide film layer, wherein the oxide film can improve high-temperature oxidation resistance and molten salt corrosion resistance of the anode; the inert anode subjected to coating and oxidation has good high-temperature oxidation resistance and aluminum electrolyzing fluoride molten salt corrosion resistance; after being subjected to electrolyzing molten salt corrosion for 300 hours, the inert anode still keep good structural integrity.

The invention relates to an integrated manufacturing method of microminiature parts based on surface coating. The technology integrates multiple technologies such as precision machining / ultraprecision machining, surface coating, precision measurement and the like, adopts the parts precision machining mode of firstly '-'(removing machining) and then '+' (combination machining), and compensates the sizes of parts through accurately controlling the thickness of a coating (plating) layer on the basis of precision measurement, thus improving machining precision and surface quality considering that the thickness of the coating layer can be precisely controlled to be in the nanometer level. The precision / ultraprecision machining technologies have wide range of machining materials and simple method, and can realize mass production of microminiature parts with three-dimensional complex structures; and the method of the invention be widely applied to the machining of various microminiature parts such as steel, alloy and the like.

The invention provides a super-thick super-hard coating and a preparation method thereof. The super-thick super-hard coating comprises a Ti bottom layer deposited on the surface of a basal body, a TiN transitional layer prepared on the Ti bottom layer, and a TiAlSiCN coating prepared on the TiN transitional layer; and the thickness of the super-thick super-hard coating is larger than or equal to 20 microns. During preparation, a columnar electric arc Ti target serves as a Ti source; a planar magnetron sputtering Si target, a planar magnetron sputtering Al target and a planar magnetron sputtering target serve as sources of Si, Al and C correspondingly; Ar serves as an ionization gas; and N2 serves as a reaction gas. According to the invention, the binding force of the basal body to a TiAlSiCN coating as well as the thickness of the TiAlSiCN coating prepared on the basal body is remarkably improved; and as elements such as Si, C and Al are added into the TiN coating, the TiAlSiCN coating with five elements is obtained, and the hardness, the abrasion resistance, the anti-friction quality, the high-temperature oxidization resistance and the corrosion resistance of the coating are further improved.