56results about How to "Good resistance to heat decay" patented technology

The invention provides a ceramic/metal composite material brake lining for a high-speed train and a preparation method of the ceramic/metal composite material brake lining, and belongs to the technical field of high-speed brake. The existing high-speed train brake lining has the defects that the thermal stability is poor, the friction factor is low, the abrasion rate is high, the thermal decay resistance is poor, and the service life is short. The ceramic/metal composite material brake lining comprises friction blocks, a base plate and a heat radiation fin, wherein the friction blocks are made of ceramic block reinforced metal composite materials, the gap width among the friction blocks is 3 to 8mm, the ceramic block is obtained through sintering ceramic posts of a certain rule and connected ceramic biscuits of ceramic substrates connected with the ceramic posts, and the connected ceramic biscuits can be formed in modes of slurry filling, gel mold filling, molding pressing, isostatic pressing and the like. The preparation method provided by the invention comprises the following steps including ceramic block sintering, surface treatment, brake lining casting, precise processing and heat treatment. The ceramic/metal composite material brake lining has the characteristics that the thermal stability is good, the friction factor is high, the abrasion rate is low, the thermal decay resistance is good, the service life is long, and the like, and the effective braking can be realized on 380km/h high-speed trains.

The invention discloses a l-noise heat-fade-resistant resin-base friction material which is prepared from the following components in percentage by mass: 10-15% of nano aluminum oxide modified phenol aldehyde resin, 3-6% of aramid fiber pulp, 12-18% of mineral fiber, 5-7% of graphite, 3-5% of antimony trisulfide, 5-7% of coke, 0.5-1.5% of aluminum oxide, 3-5% of ferric oxide, 5-7% of cashew oil friction powder, 3-9% of expanded vermiculite, 2-6% of kieselguhr, 3-9% of nitrile-butadiene rubber and the balance of barium sulfate. The material has the advantages of appropriate and stable friction factor, favorable heat fade resistance, low abrasion ratio, low braking noise, high plastic deformation resistance, high shock resistance and the like, and conforms to the operating requirements.

The invention relates to a cross-country friction material composition for air discs, and the cross-country friction material composition for air discs is characterized by being composed of the following raw materials in parts by weight: 20-52 parts of reinforced fibers, 4-16 parts of an adhesive and 23-86 parts of a friction performance modifier. The cross-country friction material composition for air discs is prepared by the steps of weighing the reinforced fiber, the adhesive and the friction performance modifier by weight to prepare a molding compound, paving a base-layer material formed by weighed fiber material and adhesive on a mold, paving weighed friction material on the base layer to carry out thermocompression, and finally carrying out thermosetting. The cross-country friction material composition for air discs is used for the air disc brakes in complicated road conditions, particularly the cold highland area and wading road conditions, so that a friction material which has good heat recession resistance, high wading restoration performance, temperature alternation repeated impact resistance and stable friction performance is provided.

The invention relates to the technical field of brake materials, in particular to a powder metallurgy friction material for high-speed train braking and a preparation method of the powder metallurgy friction material. The powder metallurgy friction material is prepared from the following raw materials: copper powder, iron powder, copper-plated flake graphite, copper-plated graphite granules, chromium iron powder, molybdenum disulfide powder and alumina fiber through a powder metallurgy process. The powder metallurgy friction material has good mechanical properties, and is stable in friction coefficient, small in abrasion loss and good in thermal failure resistance; through the adopted raw materials and the ratio, the friction material with excellent properties can be prepared at the relatively-low sintering pressure and temperature, energy consumption is saved, a preparing process is simple and easy to control, the performance is excellent, and good application prospects are achieved.

The invention provides a high-speed low-load basalt fiber-reinforced frictional material with moderate frictional coefficient and a preparation method thereof. The high-speed low-load basalt fiber-reinforced frictional material comprises the following components in percentage by mass: 5-9% of basalt fibers, 15% of steel fibers, 4-10% of mineral fibers, 10% of acrylonitrile-butadiene rubber phenolic resin, 10% of barium sulfate, 8% of iron ore, 3% of alumina, 6.25% of white mica, 5% of vermiculite, 14% of petroleum coke, 3.75% of frictional powder and 12% of graphite. The preparation method comprises the following steps of: preparing raw materials, carrying out manual stirring, carrying out mechanical stirring, carrying out secondary manual stirring, carrying out secondary mechanical stirring, and carrying out hot press moulding and curing, so that the basalt fiber-reinforced frictional material is obtained. Excellent properties of the basalt fibers are utilized, expensive aramid fibers are replaced by cheap fibers, the high-speed low-load basalt fiber-reinforced frictional material has the advantages of stable frictional coefficient in high temperature working environment, relatively low wear rate and good heat fading resistance, the wear resistance and pressure-bearing capacity of the material are improved, the cost is reduced, the hardness is moderate, and requirements of the frictional material can be better met.

The present invention provides a vehicle braking composite material reinforced by confusion of natural fiber and crystal whisker and preparing method thereof. The raw materials of composite friction material is composed of bamboo fiber, phenolic resin, magnesium sulfate crystal whisker, steel fiber, copper powder, graphite dust, pyrophyllite powder, aluminum oxide, iron oxide, barium sulfate and zinc stearate. The preparing method comprises the following steps: preprocessing the raw materials, mixing the raw materials, hot pressing shaping and heat processing. The invention uses the bamboo fiber with low cost for reinforcing the phenolic resin. The proper amount of wear-increasing agent, anti-wear agent and filling agent for exerting the cooperative coupling function among the substrate, the fiber/crystal whisker and filling agent, thereby obtaining the novel vehicle braking composite material which has the advantages of stable friction coefficient under different temperatures, low wear rate, high heat fading resistance, excellent braking effect, shock absorbing, noise reduction and low cost.

The invention relates to a method of preparing an automobile brake pad by adopting basalt fiber. The method comprises the following steps: butadiene nitrile rubber modified phenolic resin, surface modified basalt superfine fiber, acicular wollastonite fiber and carbon fiber are added to a material mixing machine and are mixed; then crystalline flake graphite, artificial graphite particles, chromite powder, feldspar powder, dolomite powder, fluorite powder, calcium carbonate powder, mica, nano ZnO, butadiene nitrile rubber and wollastonite are sequentially added to the material mixing machine and mix is carried out; a mixture is placed in a brake pad mould, and hot pressing and demoulding are carried out; a hot pressed material after the demoulding is subjected to grading heat treatment; and a discharged brake pad is subjected to follow-up treatment and packing. The automobile brake pad prepared by the method has a stable friction coefficient and a low wear rate, and further has high heat resistance and heat-aging resistance.

The invention discloses a preparation method of potassium titanate. According to the preparation method, potassium carbonate and titanium dioxide are mixed for 15-20 minutes, uniformly stirred and transferred to a push slab kiln; firstly, the mixture is heated in the kiln from the room temperature, heated to 300 DEG C-320 DEG C in two hours, then heated again to 700 DEG C-720 DEG C in 6 hours, kept at the temperature for 8 hours, then heated to 900 DEG C-920 DEG C in 4 hours and kept at the temperature for 4 hours; then the mixture is cooled to the normal temperature, taken out and roughly smashed firstly, and the diameters of particles are controlled to be smaller than 1 cm; the roughly smashed material is subjected to ball milling for 10-20 hours, a product is subjected to heat treatment at the temperature of 700 DEG C-800 DEG C for one hour after ball milling, and potassium titanate is obtained. The potassium titanate prepared with the method has stable friction performance after being used in the friction material and has good abrasion performance, speed characteristic and heat recession resistance and better capability of reducing brake noise.

A flax oil modified phenolic resin for friction material is prepared through proportionally mixing phenol with methylphenylsulfonic acid, stirring, adding flax oil, heating, reacting, cooling while stirring, heating while adding formaldehyde, stirring, adding ammonia water, slow heating until yellow turbid presents, cooling to 50 deg.C, vacuum dewatering until it become transparent, adding absolute alcohole, stirring while dissolving, and cooling, It has high thermal stability.

The invention discloses a mine hoist hard magnetic brake shoe material formula and a producing method thereof, the mine hoist hard magnetic brake shoe material comprises the following components in parts by weight: 10 to 20 parts of an organic binder, 15 to 50 parts of a reinforcing fiber, 15 to 45 parts of a friction performance regulator, 3 to 10 parts of a filler and 5 to 40 parts of a hard magnetic material. The producing method comprises crushing, mixing, hot pressing forming, magnetizing, heat treatment and surface processing technology and the like. The beneficial effects are that: a mine hoist hard magnetic brake shoe shows stable friction and wear properties and good heat resistance, and is better adapted to high speed and heavy load extreme braking working conditions; the added hard magnetic material increases the friction coefficient and reduces wear rate of the mine hoist brake shoe, the magnetized brake shoe has higher remanent magnetization and provides most basic material conditions for the magnetic field control of the braking friction process. The magnetized mine hoist hard magnetic brake shoe can maintain magnetism for a long term, the friction behavior can be influenced and adjusted in the braking process without an applied magnetic field.

The invention relates to a composite friction material which is based on a carbon component with controllable size and dimension and a preparation method of the composite friction material. The composite friction material comprises a steel core plate layer, wherein a carbon paper-based friction layer is arranged on the surface of the steel core plate layer, and the friction material adopts 2.5D multi-dimensional carbon fiber to achieve controllable size and dimension; the preparation method comprises the specific steps: proportioning the carbon component; preparing a preform on a 2.5D multi-dimensional braiding machine; and preparing the composite friction material. The composite friction material is prepared from the following raw materials of: in parts by weight, 0.5-2 parts of nanocarbon, 85-90 parts of carbon fiber, 5-8 parts of aramid fiber and 4-5 parts of glass fiber. The nanocarbon is dispersed more uniformly in a matrix by utilizing the nanocarbon and carbon fiber, so that thecomposite friction material which is based on the carbon component with controllable size and dimension and has light weight, high specific strength, high friction coefficient, small wear rate and low porosity, a uniform and compact friction material and better heat fading resistance is prepared, the service life of the product is prolonged, and phenomena of fiber shedding is reduced; the preparation method of the composite friction material is provided.

The invention discloses a novel bio-based high-strength wear-resistant nylon composite material and a preparation method thereof. The composite material is prepared from the following raw materials in percentage by mass: 70-80% of nylon, 3-5% of a wear-resistant agent, 10-20% of a reinforcing agent, 0.2-0.5% of an antioxidant and 0.2-0.5% of color master batch. The preparation method mainly comprises the following steps: blending and extruding a strip-shaped blend by a double-screw extruder or an injection molding machine, cooling by circulating water, and granulating in a granulator to obtain the composite nylon particles. The wear-resistant material has the characteristics of high temperature resistance, wear resistance and good thermal decay resistance, is simple in preparation process, and effectively solves the problems of high wear rate, unstable friction coefficient, lower impact strength and the like of similar friction materials at high temperature in comparison with the conventional common method for improving the wear resistance of nylon by adding assistants such as PTFE and molybdenum disulfide; and meanwhile, the bio-based composite material has good economic benefits and environmental friendliness.