43results about How to "Lower deformation temperature" patented technology

A two-step squeeze method with equal channel angle for Mg-alloy includes such steps as designing equi-channel squeezing die set, regulating deformation speed and temp to find out the lowest temp for non-crack deformation, equichannel squeezing by 2-4 passes, lowering the deformation temp, and squeezing by 4-8 passes. Its advantage is high strength and toughness.

The invention discloses an isothermal forging method for titanium alloy blade, which is implemented by the following steps: (1) coating lubricant on the surface of pre-forged titanium alloy blade blank; pre-heating with an electrothermal furnace to the deformation temperature of the blade blank; (2) fixing a lower die holder in an isothermal molding heater, and respectively fixing the upper die and the lower die on the upper die holder and lower die holder; (3) fixing the isothermal molding heater on a hydraulic press, heating to 900-930 DEG C and maintaining the temperature for at least 3h; (4) taking the blade blank out of the electrothermal furnace, putting into the upper die and the lower die in the isothermal molding heater, forging by the hydraulic press, and controlling the hydraulic press to perform return stroke operation when the dimension of the blade blank satisfies the requirement. The titanium alloy blade blank obtained by the inventive method has a preciseness satisfying technical requirement and obviously improved mechanical property.

The invention relates to a multidirectional combined type circulating upsetting device and an upsetting method thereof, and belongs to the technical field of plastic forming. The upsetting device comprises a forward upsetting device and a lateral upsetting device. The method comprises the following steps of: in the forward upsetting process, prearranging bar blanks of which the cross sections are square in a forward upper die cavity of the forward upsetting device, so that the blanks are subjected to compressive plastic deformation downwards to fill in a forward lower die cavity finally; opening the forward upsetting device, taking the blanks out and putting the blanks in a lateral upper die cavity of the lateral upsetting device, with the side face facing downward, so that test samples are subjected to lateral upsetting deformation towards an lateral opening in a lateral lower die, and stopping pressing until a lateral punch presses to a parting surface of the lateral upsetting device; and repeating the steps for multiple times to perform multidirectional combined type upsetting circularly. By the upsetting device, superfine crystal blocks with uniform tissue can be prepared, so the upsetting device is used for preparing various superfine crystal materials such as pure metals, alloys, intermetallic compounds, composite materials, high polymer materials, semiconductor materials and the like.

The invention provides a preparation method of a carbon nanotube / alloy composite with directionally aligned carbon nanotubes. The method comprises the following steps: first, evenly mixing a carbon nanotube powder and an alloy powder according to proportion, and consolidating into block blanks; then heating the block blanks to a superplastic forming temperature of the alloy material in vacuum; and finally applying external force to form a velocity gradient field in the block blanks, so that carbon nanotubes align directionally along a filament line under the effect of fluid shear stress, and cooling and solidifying to obtain the carbon nanotube / alloy composite with directionally aligned carbon nanotubes. The invention solves the problem of directional alignment of carbon nanotubes in a carbon nanotube / alloy composite, so as to give full play to the performance of carbon nanotubes.

The invention provides a biodegradable oxygen absorbing plastic comprising a biodegradable substrate a sufficient concentration of reduced iron particles to adsorb oxygen in significant quantities and reduce the deformation temperature of the substrate substantially below the deformation temperature without iron particles present.

The invention discloses a pressing head and device for achieving densification of a spray deposition porous panel and application of the pressing head and the device. An installation end face and a working end are arranged on the pressing head, and a first pressure keeping area, a main pressing area, a prepressing area and a second pressure keeping area are arranged at the working end in the advancing direction of the pressing head. The main pressing area is a horizontal plane, the prepressing area is a slope and inclines from the main pressing area to the installation end face, and the two pressure keeping areas are used for preventing materials from flowing when densification is achieved. The four areas where smooth transition exists are arranged on the pressing head, continuous deformation of the materials is achieved in the densification process, and no fracture can be produced. Meanwhile, the invention discloses the device which is used for achieving densification and provided with the pressing head. When the panel is machined through the device, the pressing face of the main pressing area horizontally acts on a panel blank, and the pass reduction of the pressing head is larger than the inclination height of the prepressing area of the pressing head relative to the main pressing area of the pressing head. Uniformity of the microscopic structure of the panel blank can be kept in the densification process.

The invention relates to a processing and forming process of a high-strength nickel-based high-temperature alloy bar. The bar comprises the following components of, in percentage by mass, 16%-23% of Cr, 15%-20% of Co, 2.5%-4.0% of Al, 1.0%-2.5% of Ti, 0.5%-1.5% of Nb, 3.0%-7.0% of W+Mo, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, 0.04%-0.07% of C, and the balance is Ni. Analloy is mainly in a dual phase structure of austenite and Ni3Al(gamma'), as well as M23C6 type carbides distributed discontinuously at a grain boundary. The alloy is prepared by adopting a vacuum smelting process, and then is forged into a bar by adopting a multi-pass small deformation mode, and finally surface turning and heat treatment are carried out on the bar. According to the process, deformation processing of the alloy with high content of W and Mo is conducted, and the final deformation of the alloy can reach 75% or higher while the strength of the alloy is considered.

Disclosed is a method for preparing a monolayer cubic boron nitride grinding wheel by pressure welding. The method includes the following steps of (1) selecting a grinding wheel base material and using a mechanical processing method to prepare a grinding wheel substrate; (2) preparing an amorphous alloy binding layer with a uniform thickness in a protection environment; (3) configuring and fixing cubic boron nitride abrasive particles on the surface of the amorphous alloy binding layer at the room temperature, manufacturing a grinding wheel blank and placing a ceramic pressing piece and a pressing matter on top of the grinding wheel blank; and (4) placing the grinding wheel blank, the ceramic pressing piece and the pressing matter in a heating furnace and then rapidly cooling to the room temperature to obtain the monolayer cubic boron nitride grinding wheel. The amorphous alloy material has the advantages of high tensile strength and hardness, low heat expansion coefficient and the like, so that the strength and abrasion resistance of a grinding wheel combination material can be improved, and a residual stress formed between the abrasive particles and the combination material can be reduced. The abrasive particles are pressed into the amorphous alloy, due to the fact that many active elements which can be reacted with cubic boron nitride are contained in the material, a small amount of compound can be formed through prolonging the heat preservation time, and the holding force of the amorphous alloy on the abrasive particles can be increased. The processing quality of the prepared grinding wheel surface is high, and the grinding wheel can be used for high precision grinding processing.

An optical glass includes, by weight: 1% or more and 5% or less of silicon oxide (SiO₂); 15% or more and 24% or less of boron oxide (B₂O₃); 0.1% or more and 3% or less of aluminum oxide (Al₂O₃); 1% or more and 14% or less of zinc oxide (ZnO); 35% or more and 45% or less of lanthanum oxide (La₂O₃); 5% or more and 10% or less of yttrium oxide (Y₂O₃); 5% or more and 13% or less of tantalum oxide (Ta₂O₅); and 0.5% or more and 3% or less of lithium oxide (Li₂O).

The invention discloses a preparation method of an aging-free high-strength and high-ductility aluminum alloy based on large deformation homogenization. The production method comprises the following steps of A, cutting 7XXX-series aluminum alloy cast ingots to obtain blanks; B, conducting continuous equal-channel angular pressing machining on the blanks at the solution temperature to realize largedeformation homogenization and obtaining supersaturated solid solution block extrusion blanks; C, cutting the block extrusion blanks into alloy bars of which the length direction is parallel to the equal-channel angular pressing direction; and D, conducting hot extrusion processing on the alloy bars to obtain the aging-free high-strength and high-ductility aluminum alloy based on large deformation homogenization. Through the preparation method, the large deformation homogenization effect is achieved through continuous equal-channel angular pressing at the solid solution temperature, the defect density of the homogenized alloy is increased, grains are refined through follow-up hot extrusion, dynamic precipitation of nano precipitated phases is promoted, the aluminum alloy structure with the refined grains and uniform and high-density nano precipitated phases is obtained, and the strength and ductility of the alloy are remarkably improved.

The invention discloses a wear-resisting bearing steel ball. The wear-resisting bearing steel ball comprises, by weight, 0.8%-0.9% of C, 1.5%-1.65% of Cr, 0.1%-0.3% of Si, 0.4%-0.6% of Mn, 0.01%-0.03% of Ni, 0.2%-0.4% of Mo, 0.3%-0.4% of Al, 0.1%-0.2% of V, smaller than or equal to 0.01% of S, smaller than or equal to 0.01% of P and the balance Fe, wherein the expression that C-0.8Al-1.3V is smaller than 0.51% is met. The invention further discloses a preparing method of the above wear-resisting bearing steel ball. Due to the fact that all the elements are matched with a proper proportion and the proper preparing method is matched, small spherical carbide can be promoted to be evenly distributed in the steel ball, the spheroidizing annealing time is shortened, the large amount of carbide is promoted to be subjected to solid solution, wear resistance, hardness, strength and toughness of the wear-resisting bearing steel ball are greatly improved, and residual stress is eliminated.

An optical glass in includes SiO₂, B₂O₃, Al₂O₃, BaO, CaO, ZnO, La₂O₃, Gd₂O₃, and Y₂O₃, each in a specific ratio. Further, the optical glass satisfies the following conditional expressions (1) and (2), taking the content of SiO₂ as A, the content of B₂O₃ as B, the content in total of La₂O₃, Gd₂O₃ and Y₂O₃ as C, and the content in total of SiO₂ and B₂O₃ as D.

0.35<A/B<0.70  (1)

0.80<C/D<1.0  (2)

By the above constitution, a high refractive index and low dispersibility are secured and at the same time deformation temperature (and glass transition temperature) lowers. By containing Al₂O₃, the glass structure is stabilized and a failure in appearance such as cloudiness in press molding is difficult to occur.

The invention discloses a high-strength bearing steel ball. The high-strength bearing steel ball comprises, by weight, 0.85%-0.95% of C, 1.3%-1.4% of Cr, 0.1%-0.3% of Si, 0.2%-0.4% of Mn, 0.1%-0.2% of Mo, 0.05%-0.07% of Ni, 0.08%-0.1% of W, 0.2%-0.3% of V, 0.1%-0.2% of Nb, smaller than or equal to 0.01% of S, smaller than or equal to 0.01% of P and the balance Fe, wherein the expression that C-2.3W-0.9V-1.1Nb is larger than 0.14% and smaller than 0.46% is met. The invention further discloses a preparing method of the above high-strength bearing steel ball. The high-intensity bearing steel ball has good strength, hardness, wear resistance and toughness.

The invention relates to a deformation material, prepared from the following components in parts by mass: 20-40 parts of SEEPS, 10-25 parts of white oil, 10-30 parts of a plasticizer, 15-35 parts of petroleum resin and 0.2-0.3 part of an antioxidant. According to the deformation material, the SEEPS is used as a base material, the white oil, plasticizer, petroleum resin and antioxidant are used as auxiliary materials, and through reasonable proportioning, the binding property of the deformation material can be increased, and the elasticity and intensity of the material are reduced, thereby obtaining the deformation material with a lower deformation temperature. As shown by test data, the deformation temperature of the deformation material is 70-90 DEG C, the deformation temperature is lower, so the deformation material is safer in the use process for children.

The invention relates to a method for preparing secondary hardening ultrahigh-strength steel through SPS (Spark Plasma Sintering) sintering and deformation and belongs to the technical field of steel and iron material preparation. The method comprises the following steps that secondary hardening ultrahigh-strength steel powder is placed in an alloy mold, and discharge plasma high-pressure low-temperature preforming is carried out on SPS equipment to obtain a preformed pressed blank; then the preformed pressed blank is arranged in a graphite mold, and low-pressure high-temperature sintering is carried out on the SPS equipment to obtain a sintered blank; and finally, the sintered blank is placed in the center of the graphite mold, and high-temperature compression deformation is carried out on the SPS equipment to obtain a secondary hardening ultrahigh-strength steel blank. According to the method, the secondary hardening ultrahigh-strength steel is prepared by adopting discharge plasma sintering-discharge plasma deformation, the operation is simple, the energy consumption is low, the secondary hardening ultrahigh-strength steel with ultrahigh strength and good toughness can be directly obtained, and the subsequent complex heat treatment process is effectively avoided.