30results about How to "Reduced propensity to form" patented technology

The invention relates to a door, in particular for a refrigerator and / or freezer, comprising a door frame (1) having a polymeric door frame profile (2), and at least two transparent panes (3, 4, 5) which are arranged spaced apart from each other and in parallel to the plane of the door frame and form together with the door frame profile (2) at least one planar hollow space (7, 8) filled with gas (6), the discs (3, 4, 5) being made of a polymeric material.

A rolling bearing includes: an outer ring, an inner ring, and rolling elements rolling on the raceways of the outer ring and the inner ring, wherein the surfaces of the inner ring and / or the raceways of the outer ring and / or the rolling elements have a polished layer, and the inner ring and / or the outer ring and / or the rolling elements are made of a steel that has a hardness of at least 58 HRC at least under the polishing layer and has: - at least 0.03 - 0.8% in the edge layer Nitrogen content, where the nitrogen is at least partially dissolved, - at least in the edge layer, a carbon content of 0.1-1.2%, a nickel content of ≤0.4%, a silicon content of 0.2-1.0%, a chromium content of ≥1.0% , ‑≤0.008% sulfur content, ‑≤15ppm oxygen content, ‑≤50ppm titanium content.

The invention discloses a directional solidification method capable of reducing the number of freckles in a variable-section casting. By adding a radiation baffle on the top of a formwork of the variable-section casting, cooling rate or solidification rate is increased, so that freckles are removed. By means of the radiation baffle, radiant heat of a heating body on the upper portion is blocked, heat absorbed by liquid phase is reduced, so that casting cooling rate is increased, dendritic structure can be refined, thermosolutal convection flow resistance is increased, solidification rate is increased, and the possibility that dendritic growth rate is larger than interdendritic flow rate is increased. By the adoption of the method, cooling rate and solidification rate can be increased during casting solidification, and the possibility of freckle formation is reduced. Specific implementation is easy, material sources are wide, consumption is low, and the original formwork does not need to be changed.

A TC4 titanium alloy flux-cored welding wire and a preparation method thereof. The invention belongs to the technical field of welding material preparation. The purpose of the present invention is to solve the problem that most of the existing welding wires for titanium alloy welding are solid welding wires, but the preparation process of solid welding wires is complicated, the cost of formula adjustment is high, and the deposition efficiency of the obtained welding wires in the welding process is low and the moistening effect is low. Technical problems of wetness and poor spreadability. The flux-cored welding wire is prepared from a TA1 titanium alloy sheath and a flux core; the TA1 titanium alloy sheath is made of a TA1 titanium strip through reeling, drawing, and annealing; the flux core is made of vanadium powder, aluminum powder, molybdenum powder, Cobalt powder, nickel powder, copper powder, silicon powder and titanium powder are mixed. Preparation method: first clean the TA1 titanium strip, ball mill the core powder, then reel the TA1 titanium strip, fill it with the core powder, roll and reduce the diameter, and then conduct cold drawing to reduce the diameter of the drawing die to obtain the flux cored welding wire. The flux-cored welding wire of the invention can be used for TC4 titanium alloy welding, has good comprehensive mechanical properties, low content of diffused hydrogen in deposited metal, and high welding efficiency.

The invention provides alloy powder for gray pig iron laser cladding repair and a preparation method of the alloy powder. The alloy powder comprises the chemical components, by weight, 12% to 24% of Cu, 1.5% to 3.5% of C, 0.2% to 2.4% of Si, 0.01% to 0.05% of Al, 0.005% to 0.01% of Ba, 0.001% to 0.01% of Ca, 0.5% to 1.2% of Co, 0.0% to 0.04 % of Y2O3, 0.0% to 0.03% of La2O3, 0.0% to 0.04% of Ce and the balance Ni. According to the alloy powder, because alloy matrix strengthening elements, graphitizing-promoting elements and grain refinement grain boundary strengthening elements are added, and the percentages of the elements are adjusted, alloy acquires the excellent comprehensive performance, the alloy has both the appropriate hardness and the appropriate strength, the possibility of white cast tissue forming is reduced, shock resistance and fatigue resistance are improved, the crack resistance, the formability, the process stability and the component uniformity of the alloy powder in a laser cladding layer are improved, and an effective method convenient to use is provided for successive repair of gray pig iron parts.

The invention discloses an anti-oxidation nickel-based superalloy powder and a preparation method thereof. Alloy elements such as Ni, Cr, and W are taken according to the proportion, the alloy is put into a vacuum induction furnace for smelting, and then placed in a vacuum consumable furnace for reheating. The master alloy ingot is obtained by melting, and the master alloy ingot is made into an electrode rod; the electrode rod is put into a plasma rotary electrode pulverizer, and the end of the electrode rod is melted with a plasma gun to obtain a spherical powder; the spherical powder is passed through an ultrasonic vibrating sieve. Screening; and then electrostatically separate the spherical powder to remove non-metallic impurities in the spherical powder to obtain pure alloy powder. In the present invention, by replacing a part of W element with Nb element, the content of W element is reduced, the formation tendency of W carbon oxide is weakened, and the content of W carbon oxide in the alloy is obviously reduced.

The invention relates to a door, in particular for a refrigerator and / or freezer, having a door frame (1) and at least two transparent panels (3, 4, 5), said door frame having polymeric door frame profile (2), the plates are arranged at a distance from one another parallel to the door frame plane and form here together with the door frame profile (2) at least one flat cavity filled with gas (6) (7, 8), wherein the plates (3, 4, 5) consist of a polymeric material.

The invention relates to a method for bonding hard alloy by solid-phase diffusion of a nano-Co intermediate layer. The surface of the hard alloy sample to be welded is polished and polished with sandpaper, and ultrasonically cleaned in acetone solution; the nano-Co is mixed with absolute ethanol to form a paste. Shape, coated on the surface of cemented carbide to be welded, assembled into cemented carbide / nano-Co / hard alloy assembly; place the assembly in a vacuum heating furnace, apply a pressure of 10MPa~20MPa, when vacuum heating When the vacuum degree of the furnace reaches (1.5~2.0)×10-3Pa, start heating, control the heating rate in the furnace to 10℃ / min~20℃ / min, raise the temperature to 1100℃~1300℃, then keep it warm for 20min~40min, and then Control the cooling rate at 5°C / min~10°C / min, cool to 400°C, and then cool with the furnace. The invention has the advantages of simple process, low cost, simple operation and high efficiency, and can realize reliable connection of cemented carbide.

A welding method for suppressing cracks in an aluminum alloy T-shaped joint relates to the field of welding. The invention aims to solve the problem of thermal cracks existing in the double-sided laser welding of the aluminum alloy T-joint. The present invention mainly utilizes the composition of the welding wire 1 to enhance the internal consistency of the welding seam and improve the strength of the welding seam, and uses the composition of the welding wire 2 to suppress cracks at the front of the solidification of the rear molten pool. On the premise of ensuring the overall flow trend of the molten pool, the invention can further improve the elimination of pores and the reduction of heat input by using heat sources such as swing laser and pulse / AC CMT. The invention is applied to the field of manufacturing welding.

The invention relates to a method for connecting a nickel-based superalloy with a Ti2AlNb alloy or a Ti3Al-based alloy, in particular to a diffusion welding connecting method adopting Cu foil and Ti foil as a composite interlayer. The diffusion welding connecting method comprises the steps that the nickel-based superalloy and the Ti2AlNb alloy or the Ti3Al-based alloy are processed into the neededsizes, ground and polished; the Cu foil and the Ti foil are subjected to oxidation film removing, and are placed into acetone with a welded base material to be subjected to ultrasonic cleaning; and the Cu foil makes contact with the nickel-based superalloy, the Ti foil makes contact with the Ti2AlNb alloy or the Ti3Al-based alloy, and thus a welded test piece with the structure of the Ti2AlNb alloy or the Ti3Al-based alloy / the Ti foil / the Cu foil / the nickel-based superalloy is obtained, a welded workpiece is placed into a vacuum heating furnace, the pressure is applied, and welding is completed after heating, heat preservation and cooling heat circulating. The welding temperature can be lowered, forming of a brittle phase of a joint is controlled, and the property of the joint is improved; and the obtained shearing strength of the joint at the room temperature reaches 240-310 MPa.

The invention provides polyether type total-synthesis compressor oil composite which is prepared from the following ingredients in weight percentage: 60%to 85% of polyether, 5% to 30%of alkyl aromatics, 0.5% to 8% of antioxidant, 0.01% to 1% of sulfur-containing or phosphorus-containing extreme-pressure anti-wear agent, 0.01% to 1% of antirust agent, 0.001% to 0.5%of metal passivating agent and 0.001% to 0.1% of demulsifying agent. The invention further provides a preparation method of the polyether type total-synthesis compressor oil composition. The polyether type total-synthesis compressor oil composition has excellent oxidation stability and thermal stability, also has excellent detergency and dispersibility, low carbon deposite and oil sludge formation inclination and excellent hydrolysis stability and demulsibility and is especially suitable for lubricating high-temperature and high-pressure worm air compressors.

The invention belongs to the field of complex hollow single-crystal blade casting, and in particular relates to a wax mold assembly structure of a single-crystal blade with integral casting of a cover plate and a cantilever structure. Since the blade cover plate is integrally cast and the casting hole diameter on the cover plate is small, the ceramic core of the blade (the part where the casting hole of the blade tip is formed) is easily broken. In addition, the blade is a cantilever structure, which cannot be positioned, which leads to defects such as eccentricity, exposed core, and miscellaneous crystals and stripe crystals in the blade during the directional solidification process. However, the combination of wax patterns is the main factor affecting the above defects. The invention solves the problem of blade eccentricity by rationally designing the ceramic core boss at the tip margin of the blade; rationally designing the degree of freedom of the core and the fixed end based on the expansion difference between the core and the shell to avoid fracture of the core; and adjusting the position of the sprue Reduces propensity for blade defect formation. The pass rate of single crystal blades formed by the molding method of the invention is relatively high.