45results about How to "Improve interface bonding quality" patented technology

The invention discloses a shaping method of a bimetallic composite-material brake drum, and relates to the shaping method of the brake drum. The shaping method includes the steps of manufacturing a brake drum jacket with a waved circumferential pipe wall by using a low carbon steel pipe, placing the brake drum jacket in a horizontal centrifugal casting machine, and pouring molten iron at a certain temperature, thus finishing casting in the casting machine and finally obtaining the brake drum compositing two metal materials of low carbon steel and cast iron. The brake drum compositing two metal materials manufactured according to the shaping method provided by the invention can fully bring respective advantages into play, is high in combination quality of an interface, and light in weight.

The invention discloses a high-strength, high-plasticity and anti-corrosion aluminum alloy laminated composite material and a manufacture method thereof, and belongs to the technical field of aluminumalloy laminated composite materials. The high-strength, high-plasticity and anti-corrosion aluminum alloy laminated composite material is composed of a 1-series or 3-series aluminum alloy multi-layermaterial and a 6-sereis aluminum alloy base layer material. Annealing treatment is conducted on the aluminum alloy multi-layer material and the aluminum alloy base layer material; washing degreasingand polishing treatment are conducted on to-be-composited surfaces, wherein the polishing stripe direction is perpendicular to the rolling direction; then, a combined blank material is obtained through laminating; single-pass cold rolling pre-compositing, heating and single-pass hot rolling compositing are sequentially conducted on the combined blank material subjected to head riveting; and finally, the high-strength, high-plasticity and anti-corrosion aluminum alloy laminated composite material with strong alloy combination adopted for the interface is obtained through solid solution-aging treatment. The high-strength, high-plasticity and anti-corrosion aluminum alloy laminated composite material and the manufacture method are low in device requirement, simple in process flow, short in period, high in production efficiency, low in energy consumption and low in cost, and the manufactured aluminum alloy laminated composite material has high strength, high plasticity and excellent anti-corrosion performance at the same time.

The invention provides a sandwiched composite heat insulating layer structure and a preparation method thereof. The preparation method comprises the following steps of: pasting a heat insulating layer, an ablation resistant layer and a transition layer in an engine combustion chamber housing, wherein the heat insulating layer and the transition layer are made of a heat insulating layer material ofan ethylene-propylene-diene monomer system, the ablation resistant layer is made of a carbon fiber phenolic aldehyde butyronitrile rubber soft sheet material, and the ablation resistant layer is divided into a plurality of pieces in a peripheral direction in the engine combustion chamber housing; and performing hot-pressing after pasting each layer, pre-drying the material of the ablation resistant layer before use, and curing a carbon rough board of the ablation resistant layer and the heat insulating layer before pasting the transition layer. The sandwiched composite heat insulating layer structure can improve integrity of the composite heat insulating layer, and strengthens reliability of a composite interface.

The invention discloses a method for reinforcing a magnesium alloy compound material through zinc oxide-covering graphene. The method comprises the following steps that a liquid-state dispersion method is adopted for firstly preparing a preform green body with a mass ratio of the zinc oxide-covering graphene to pure aluminum powder equal to 10-25%, then the preform green body is added into magnesium alloy melt, and after ultrasonic dispersion treatment with power of 500-1000 W is conducted for 120 min, under a condition of 550-630 DEG C, a casting method is adopted for preparing the AZ91 magnesium alloy compound material reinforced by the zinc oxide-covering graphene with a content of 0.1-5%. By means of the method for reinforcing the magnesium alloy compound material through the zinc oxide-covering graphene, the even dispersion of the graphene in a magnesium matrix can be effectively improved, the interface bonding quality of the graphene and the magnesium matrix is improved, meanwhile, a good crystal grain refining effect is obtained, and the mechanical performance of the compound material is greatly improved, so that the method for reinforcing the magnesium alloy compound material through the zinc oxide-covering graphene is suitable for preparing the graphene-magnesium alloy compound material excellent in performance on a large scale.

The invention discloses a fluorescent polytetrafluoroethylene material modified with carbon fibers and steel fibers and a preparing method of the fluorescent polytetrafluoroethylene material. The fluorescent polytetrafluoroethylene material modified with carbon fibers and steel fibers and the preparing method of the fluorescent polytetrafluoroethylene material are characterized in that steel fibers and carbon fibers are used for improving the tensile strength and the friction performance of polytetrafluoroethylene; meanwhile, an improved melting method is used for sintering fine filler such as SiO2 powder and Al powder to the surface of polytetrafluoroethylene at a high temperature, the surface sintered state of polytetrafluoroethylene is improved, and the joint strength is obviously improved. Besides, fluorescent powder is added in a matched mode, and the material can absorb energy after being illuminated by light and can automatically emit light in dark places.

The invention relates to a short-flow efficient production process of a double-metal composite belt material. The short-flow efficient production process of the double-metal composite belt material comprises the following steps: preparing a high-quality double-metal composite plate blanket with a metallurgical bonding interface by a continuous casting composite process and putting the high-qualitydouble-metal composite plate blanket into a heating furnace to heat; performing multi-pass rolling on the heated plate blanket by a rolling machine, wherein the pass reduction rate of the first passis controlled to be 50 to 70 percent, the pass reduction rate of the subsequent passes is controlled to be 25 to 45 percetn and the total rolling deformation quantity is controlled to be 85 to 95 percent; performing warm rolling forming, wherein the rolling process avoids lubrication; after performing acid-washing treatment, performing rolling forming on a cold-rolling machine, wherein the pass reduction rate is controlled to be 15 to 30 percent, the total rolling deformation quantity is controlled to be less than 90 percent and the rolling speed is 1 to 25 m/min; and performing rapid sensingheating continuous heat treatment on the composite belt material after cold rolling to obtain the double-metal composite belt material. The plate material prepared by the method is short in process flow, high in production efficiency and favorable for realizing large-scale production.

The invention relates to an aluminum/magnesium/aluminum composite plate with Zn solder reinforced interfaces and a powder hot-pressing preparation method thereof. The method comprises the following steps: (1) respectively spreading aluminum-containing powder and magnesium-containing powder in a mold according to an aluminum-magnesium-aluminum sequence, and adding Zn solder at aluminum/magnesium interfaces; (2) pre-pressing each powder layer immediately after the powder layer is spread in the step (1) by using a pressure head, and flattening and compacting the powder to finally form a pre-pressed composite powder block with a certain layer thickness; and (3) subjecting the pre-pressed composite powder block treated in the step (2) to hot-pressing compounding, and carrying out pressure-maintained cooling so as to obtain the aluminum/magnesium/aluminum composite plate with the Zn solder reinforced interfaces. The aluminum/magnesium/aluminum composite plate with the Zn solder reinforced interfaces has the advantages of light weight, high specific strength, high interface bonding strength, excellent comprehensive mechanical properties and the like. The composite plate and the powder hot-pressing preparation method have the advantages of low powder quality requirement, high composite plate interface bonding quality, simple preparation method, high yield, high production efficiency, production cost conservation and the like.

The invention provides a preparation method of foamed aluminum with a sandwich structure, and belongs to the technical field of non-ferrous metals. The method comprises the following steps that aluminum alloy powder is mixed with a foaming agent and a thickening agent, after hot pressing or hot extrusion is conducted, a prepared foaming precursor is placed in an aluminum alloy cavity profile withexhaust holes, scaling powder is smeared, foaming is conducted after preheating, and the foamed aluminum with the sandwich structure is obtained. The invention also provides the foamed aluminum with the sandwich structure prepared by the method, and the foamed aluminum can be a special-shaped part. The method has the advantages that the exhaust holes are used for controlling complete filling of the foamed aluminum, the soldering flux is used for improving the interface bonding quality, preheating is used for improving the uniformity of the foaming temperature, and finally the foamed aluminum material with the sandwich structure, which is completely filled and has good interface bonding, is obtained.

The invention relates to interface coated reinforced biological magnesium-based metal ceramic and a preparing method thereof. Particularly, through MgO coating, dispersion of beta-TCP ceramic particles in a magnesium alloy matrix can be improved, through the selective laser melting technology, the interface coated reinforced biological magnesium-based metal ceramic is prepared, the surface of thebeta-TCP ceramic particles is coated with MgO, on one hand, the MgO can be evenly separated out and coated on the surface of the beta-TCP, on the other hand, the MgO and the magnesium matrix has the good crystal orientation relation, in the selective laser fusion process, the wettability of beta-TCP in the magnesium melt can be improved, effective dispersion is achieved, and the agglomeration problem can be solved. In addition, the MgO and magnesium have good crystal orientation relation to enable beta-TCP to serve as heterogeneous nuclear particles of the magnesium matrix, the magnesium alloygrains are refined, meanwhile, due to existence of the nano MgO transition layer on the interface, the interface combination quality of the beta-TCP and the matrix can be improved, the composite material strength can be improved, and the high-property biological magnesium-based metal ceramic can be prepared.

The invention discloses a carbon-fiber-reinforced polytetrafluoroethylene composite material for valve sealing and a preparation method of the carbon-fiber-reinforced polytetrafluoroethylene composite material for valve sealing. The carbon-fiber-reinforced polytetrafluoroethylene composite material for valve sealing is characterized by being prepared from, by weight, 2-3 parts of carbon fibers, 5-10 parts of carbon nano tubes, 10-15 parts of ethyl alcohol, 25-35 parts of polytetrafluoroethylene emulsion, an appropriate amount of acetic acid, 15-25 parts of hydrofluoric acid, 15-25 parts of nitric acid, 1-2 parts of lanthanum chloride, 4-6 parts of silane coupling agent KH550, 2-3 parts of edetic acid, 1-2 parts of Fe(NO3)3, 1-2 parts of Co(NO3)3, an appropriate amount of ammonium hydroxide, an appropriate amount of nickel foam, 3-5 parts of diamond, 5-7 parts of dodecyltrimethylammonium bromide, an appropriate amount of methane, an appropriate amount of argon, an appropriate amount of nitrogen and100-150 parts of distilled water. The carbon-fiber-reinforced polytetrafluoroethylene composite material for valve sealing has the advantages that the nickel foam in a three-dimensional form serves as polymer filler, so that mechanical performance of the composite material is improved, and the added carbon nano tubes can be distributed more evenly; through treatment of the carbon fibers, surface wettability is improved and the interface adhesion quality of the composite material is improved.

The invention discloses a sound-absorbing carbon fiber/steel fiber modified polytetrafluoroethylene material and a preparation method thereof. The invention is characterized in that steel fiber and carbon fiber are used for enhancing tensile strength and friction performance of polytetrafluoroethylene; and fine fillers such as SiO2, Al powder, etc. are sintered onto the surface of polytetrafluoroethylene at high temperature by an improved melting method so as to improve surface sintering condition of polytetrafluoroethylene and obviously raise joint strength. In addition, by the addition of sound absorbing materials such as natural zeolite, etc., sound-absorbing effect of the composite material is enhanced.