52results about How to "Excellent hot corrosion resistance" patented technology

This invention relates to high-strength thermal abrasion resistance high-temperoducre alloy with low segregation and directional solidification properties. Its constitutions are (wt.%): Co9-12, Cr11-16, Mo1-3, W4-7, Al4-7, Ta4-7, Ti0-2, Re2-3, C0.01-0.15, 0.005-0.02 and Ni as the rest. The heat treatment for directional solidification steps are: 1240+-10deg.C for 0.5Hrs; 1260+-10deg.C for 0.5Hrs; 1280+-10deg.C for 4Hrs; air cooling to room temperature; 1120+-10deg.C for 4-1 Hrs; slow cooling to 1080+-10deg.C for 4Hrs; air cooling to room temperature; 900+-10deg.C; air cooling to room lemperature. This invention alloy can meet the requirement strength for design of turbine blade of aircraft engine but also has excellent thermal abrasion resistance property. The plane with the turbine blade of aircraft engine can be used for high altitude flight and flight in corrosion environment obove turbine blade of aircraft engine can be used for high altitude flight and flight in corrosion environment above sea.

The invention discloses a process for preparing nickel-base superalloy. The superalloy consists of the following components in percentage by weight: 22.5 to 24.5 percent of Cr, 7.0 to 8.0 percent of Co, 6.5 to 7.5 percent of W, 3.0 to 4.0 percent of Mo, 1.2 to 1.8 percent of Al, 1.5 to 2.5 percent of Ti, 2.0 to 3.0 percent of Nb, 1.0 to 2.0 percent of Mn, 2.0 to 4.0 percent of Fe, 0.02 to 0.08 percent of B, 0.5 to 1.5 percent of Ce, less than or equal to 0.1 percent of C, less than or equal to 0.2 percent of Si, less than or equal to 0.008 percent of P, less than or equal to 0.008 percent of S and the balance of Ni. The process for preparing the nickel-base superalloy comprises a smelting process and a heat treatment process, wherein the smelting process comprises the steps of: smelting master alloy by using a vacuum induction furnace, and performing directional solidification in a liquid metal directional furnace to prepare directional column crystal alloy, wherein the vacuum degree of the directional furnace is about (1-5)*10<-4>mmHg, the pouring temperature is 1,580 to 1,600 DEG C, the drawing speed is 4 to 8mm/min, the temperature gradient is 75 to 85 DEG C/cm, and the temperature of liquid tin is 250 to 350 DEG C; the heat treatment process comprises the following steps of: heating the column crystal alloy obtained through smelting to 1,240 to 1,260 DEG C, preserving heat for 3 to 5 hours, and performing air cooling to room temperature; heating to 1,150 to 1,170, preserving heat for 3 to 5 hours, and performing air cooling to room temperature; and heating to 930 to 950 again, preserving heat for 8 to 12 hours and performing air cooling to room temperature.

The invention relates to an inorganic high temperature protection coating technology, particularly to a high-temperature oxidation resistant and corrosion resistant glass ceramic composite coating which can be used for components made of titanium alloy and other metallic materials and a preparation technology of the composite coating. The coating is formed through uniformly dispersing and distributing micron scale ceramic particle phase and nanoscale metal/oxide mixed powder into a glass matrix phase, the glass matrix phase is formed through performing high temperature conversion on sodium silicate water glass or potassium silicate water glass, the micron phase ceramic particle phase accounts for 15-60 wt% of the glass ceramic composite coating, and the nanoscale metal/oxide mixed powder accounts for 0.5-5 wt% of the glass ceramic composite coating. The coating preparation technology comprises the steps of coating material preparation, coating material spraying and high temperature processing. The glass ceramic composite coating, provided by the invention, is compact, has no holes, has higher strength and breaking tenacity, and has good binding force with a titanium alloy matrix and thermal expansion coefficient matched with the titanium alloy matrix, thereby having excellent anti-thermocycling thermal shock performance, high-temperature oxidation resistance and corrosion resistance.

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 novel high-temperature alloy material, in particular to a high-strength corrosion-resistant nickel-based monocrystal superalloy M09A. The superalloy comprises the following chemical compositions (by weight percent): 11.0-15.0 percent of Cr, 8.0-9.0 percent of Co, 1.8-2.2 percent of Mo, 3.5-4.4 percent of W, 5.0-6.0 percent of Ta, 4.0-5.4 percent of Al, 2.5-3.5 percent of Ti, 0.004-0.007 percent of B, 0.01-0.03 percent of C, and the balance of Ni. The alloy material of the invention has good high-temperature resistance, good hot corrosion resistance and structural stability.

The invention discloses a cobalt-based high temperature alloy, a preparation method thereof and application in a heavy-duty gas turbine, and belongs to the technical field of casting isometric crystalcobalt-based high temperature alloy. The alloy comprises chemical compositions of, 22.0-25.0% of Cr, 9.0-11.0% of Ni, 5.4-6.4% of W, 0.7-1.3% of Mo, 3.0-4.0% of Ta, 0.47-0.65% of C, 0.15-0.25% of Ti,0.05-0.2% of Al, 0.06-0.35% of Zr, 0-0.1% of Mn, 0-0.4% of Si, 0.005-0.015% of B, and the balance Co. The cobalt-based high temperature alloy has excellent mechanical properties, physical and chemical properties and high temperature structural stability, and is suitable for heavy-duty gas turbine guide blade materials for ground and ships.

The invention discloses a low-rhenium high-strength thermal-corrosion-resistant nickel-based single-crystal high-temperature alloy and a manufacturing method thereof. The alloy comprises the followingchemical components of, in percentage by weight, 9.0-12.0% of Cr, 8.0-11.0% of Co, 0.2-1.5% of Mo, 4.5-7.0% of W, 3.5-5.5% of Al, 2.0-4.0% of Ti, 4.5%-6.5% of Ta, 0.1-0.3% of Hf, 1.2-2.0% of Re, andthe balance Ni. The high-temperature endurance performance is superior to that of the PWA1483 alloy, the Re element is low, and good thermal corrosion resistance is achieved; compared with the existing nickel-based single-crystal high-temperature alloy, the content of the Cr element in the alloy component is relatively high, the alloy component has relatively high thermal corrosion resistance; thealloy has good high-temperature endurance performance, the high-temperature performance is superior to that of PWA1483, and the creep time of the 982 DEG C/100 Mpa is larger than or equal to 5000h.

The invention discloses a method for preparing a composite coating by adopting multi-stage pack cementation aluminizing in combination with micro-arc oxidation and belongs to the technical field of high-temperature protective coatings. A continuous and smooth NbAl3 aluminized layer is obtained firstly on a substrate with a multi-stage pack cementation aluminizing technology; a micro-arc oxidation electrolyte is regulated by adding film-forming agent sodium fluoride, modifier sodium tungstate, stabilizer EDTA-2Na and rare-earth salt yttrium nitrate; and a uniform and regular porous Al2O3 ceramic film layer is prepared on the NbAl3 aluminized layer, and the Al2O3/NbAl3 composite coating is obtained. The Al2O3/NbAl3 composite coating has the characteristics of good bonding performance, uniform coating and excellent high-temperature hot corrosion resistance, the coating with different thicknesses can be obtained by controlling pack cementation aluminizing time and temperature as well as the electrolyte and electrical parameters of the micro-arc oxidation, the process is simple, and the controllability is high.

The invention discloses a high-temperature alloy material and a preparation method thereof, comprising C: 0.05-0.15%, Cr: 20.5-23.00%, Mo: 8.00-10.00%, Co: 0.50-2.50%, W: 0.20 to 1.00%, Fe, 17.00 to 20.00%, B: 0.001 to 0.010%, the balance being Ni and unavoidable impurities. The high-temperature alloy prepared by the invention has a uniform structure, and the slag material used for electroslag remelting is processed with a reasonable ratio to improve the purity of the material, so that the plasticity and impact toughness of the alloy material are enhanced at low temperature, room temperature and high temperature. The amount of deformation and the method of multiple fires are forged into materials, so that the structure of the turbine blade is uniform and has excellent fracture toughness. The alloy material produced by the present invention has a tensile strength σb≥700N/mm at room temperature. ² ; Yield strength σ0.2≥320N/mm ² ; Elongation δ5≥50%; High temperature (816±3℃) creep rupture test ≥103N/mm ² , breaking time ≥ 25h, elongation δ5 ≥ 60%, meeting the performance requirements of turbine blades.

The invention discloses a method of preparing a CoAlNi coating on Ni-based high-temperature alloy through pack cementation. The thickness of the CoAlNi coating is 10-30mu m, and the CoAlNi coating contains two phases Al0.9Ni1.1 and AlCo. A continuous and dense Al2O3 oxide layer can be formed through high-temperature oxidation of the prepared CoAlNi coating at 1050 DEG C so as to prevent further oxidation of the coating and a substrate and improve the resistance of the substrate against the high-temperature oxidation. The prepared CoAlNi coating has good resistance against hot corrosion at thehigh temperature of 900-950 DEG C.

A high-temp Cr-base alloy used for refractory parts of heater contains C (0.01-0.5 wt.%), Si (0-2), Mn (0-2), W (10.1-18), Fe (10.1-30), Mo (0-3), Al (0-2), Ti (0-1.5) and Cr (rest). Its advantages are high smelting point, stable microscopic structure, and excellent high-temp strength and resistance to oxidation and hot corrosion.

The invention relates to a manufacturing method for a functionally gradient material capable of reinforcing a tuyere. The manufacturing method comprises the following steps: firstly, cleaning oil stain and dust on the inner wall and the small end of the copper matrix tuyere, and pre-heating to about 500 DEG C; overlaying a Ni202 transition layer on the copper matrix tuyere; overlaying a CoGrW reinforcing layer on the transition layer; performing sandblast texturing treatment on the reinforcing layer for enabling the surface to be flat, wherein the whole overlaying layer is 3 mm in thickness; plasma-spraying a ZrO2 thermal barrier coating with the thickness of 0.5 mm after the CoGrW reinforcing layer is preheated, in order to prevent the phenomenon that cracks exist in the CoGrW reinforcing layer during the use due to the different heat conductivity coefficient. According to the invention, the transition layer and the reinforcing layer are overlaid, the thermal barrier coating is plasma-sprayed, and the overlaying layer can reach the thickness and metallurgical bonding strength required for use, so that falling can be prevented during the use, the copper matrix tuyere can be protected by the thermal barrier coating during use, the cracking or falling of the reinforcing layer caused by thermal stress is reduced, the hardness is high, the abrasion resistance is excellent, the cost is low, the production efficiency is high, and the service life can reach 10 months.

The invention discloses a method for aluminizing and chromizing the surface of a nickel-based high-temperature alloy used on a turbine blade or a guider. The method comprises the following steps: 1) preparing an aluminizing and chromizing agent; 2) pretreating the agent; 3) pretreating a part; 4) carrying out aluminizing and chromizing; and 5) post-treating the part containing an aluminum-chromium coating. The method mainly aims at the situation that in an environment with hot corrosion as a main damage form, chromium element can quickly generate a stable chromate layer, so that a single chromized layer and an aluminized and chromized layer have better hot corrosion resistance than a single aluminized layer. The oxidation resistance and the hot corrosion resistance are considered, and the aluminized and chromized layer has the optimal comprehensive corrosion resistance. According to the invention, a special formula and a unique atmosphere protection method are adopted, and the part is subjected to sufficient pretreatment and post-treatment, so that the obtained infiltrated layer has more excellent performance than an infiltrated layer manufactured by an existing method.

The invention discloses a method for improving hot corrosion resistance of Co-Al-W high temperature alloy by utilizing pre-oxidation. The method comprises the following steps: under atmospheric conditions, heating cobalt-based high temperature alloy to 950 DEG C and carrying out oxidation treatment for 50-100 hours to obtain a pre-oxidized layer with the thickness of 2-10 micrometers, wherein thethickness of an Al2O3 layer is 0.5-2 micrometers. The method disclosed by the invention has the advantages that the process is simple and the energy is saved. Compared with un-pre-oxidized alloy, thepre-oxidized alloy has the advantages that the pre-oxidized layer is structurally stable in a corrosive medium and the corrosive medium can be effectively prevented from entering the alloy matrix, sothat the corrosion weight gain of the alloy is significantly reduced by 80% or above and the hot corrosion resistance of the alloy is remarkably enhanced.

The purpose of the present invention is to provide a thermal corrosion resistance nickel-based high-temperature alloy having a stable structure, wherein the components of the alloy comprise, by wt%, 0.06-0.2% of C, less than or equal to 0.035% of B, 13.0-15.0% of Cr, 9.0-10.0% of Co, 1.2-1.8% of Mo, 3.5-4.1% of W, 2.8-3.4% of Al, 3.1-4.0% of Ta, 4.6-5.2% of Ti, less than or equal to 1.0% of Fe, less than or equal to 0.06% of Zr, and the balance of Ni, wherein the impurity P content is less than or equal to 0.005%, the impurity Si content is less than or equal to 0.2%, the impurity Pb content is less than or equal to 0.0005%, the impurity Bi content is less than or equal to 0.0001%, the impurity As content is less than or equal to 0.005%, the impurity Sn content is less than or equal to 0.002, and the impurity Sb content is less than or equal to 0.001%. According to the present invention, the alloy has high structure stability and good thermal corrosion resistance, is suitable for production of high-temperature combustion turbine components, and can be used for a long time in fuel gas corrosion environments.