39results about How to "Reduce low temperature brittleness" patented technology

The invention provides new composite materials containing aerogels blended with thermoplastic polymer materials at a weight ratio of aerogel to thermoplastic polymer of less than 20:100. The composite materials have improved thermal insulation ability. The composite materials also have better flexibility and less brittleness at low temperatures than the parent thermoplastic polymer materials.

The invention discloses a construction process of a colored pavement epoxy non-slip wearing layer structure. The construction process comprises the following steps: (1) pavement patching; (2) pavement shot blasting; (3) epoxy resin stirring; (4) paving of epoxy resin; (5) spreading of aggregates; (6) curing and recovering of the aggregates; and (7) opening of transit. Compared with the prior art, the construction process has the advantages that the wearing layer structure is simple in process, easy to operate, good in non-slip performance, high in bonding strength, small in thickness, convenient in construction, rapid in curing and high in material water resistance; running noise of vehicles is lowered; driving conditions are improved; the wearing layer structure is excellent in corrosion resistance, high in flame retardant property, high in ductility, uniform in expansion, high in low-temperature resistance, low in low-temperature brittleness, excellent in thermal ageing resistance, high in high-temperature stability and high in wear resistance, the surface aggregate is high in wear resistance, a conventional road elevation and the conventional clear height of a bridge are not changed, existing various structural and non-structural pavement diseases can be repaired at a time, the maintenance cost is saved, and the service life of a pavement is greatly prolonged.

The invention discloses a high-speed train brake disc material with a stable friction coefficient. The raw materials and the ratio are as follows: C: 0.20-0.35%; Si: 0.21-0.31%; Mn: 0.68-1.19%; V: 0.18-0.42 %; Cr: 1.07-2.54%; Ni: 0.89-2.33%; Mo: 0.17-0.39%; Cu: 0.12-0.75%; P: 0.005-0.01%; ; Fe: margin. The invention also discloses a preparation method of the high-speed train brake disc material with stable friction coefficient. In the structure of the brake disc material of the present invention, there is Fe dispersed in the grain 3 Al ultrafine phase, Fe 3 The Al ultrafine phase has a low thermal expansion coefficient and high hardness, and its friction performance does not cause fluctuations in friction performance with changes in braking conditions such as friction temperature, so that the friction disc has a stable friction coefficient during the braking process.

The invention provides a low-hydrogen electrode with favorable low-temperature impact toughness, wherein the electrode using corresponds to a top low-carbon steel H08A welding core of the requirement of GB / T3429-2002, and electrode medicine skin comprises the following components in percentage by weight: 35-45% of marble, 15-18% of fluorite, 4-8% of silicon micro powder, 4-8% of ferromanganese, 5-8% of ferrosilicon, 8-11% of ferrotitanium, 3-6% of rutile, 1-3% of mica, 6-10% of ferrous powder and 0.5-1.5% of magnesium powder, wherein the fluorite is characterized in that CaF2>=95%, SiO2<=4.5%, S<=0.020%, P<=0.030%, and 100% of meshes of granularity is 100 meshes of fluorite. According to the invention, through controlling the adding amount of fluorite and controlling the fluorite granularity 100% of 100 meshes, the obtained low-hydrogen electrode has good welding process performance, and the welding seam tissue low-temperature brittleness is lowered obviously.

The invention discloses a low-temperature steel bar and a production method thereof, the chemical composition of which is calculated by mass percentage: Ni 0.8-0.9%, Mn 1.6-1.7%, Si 0.3-0.4%, C 0.04-0.08%, Al 0.01-0.02 %, P≤0.007%, S≤0.004%, O≤0.002%, N≤0.003%, As≤0.005%, H≤0.0002%, and the rest are Fe and unavoidable impurities. The production methods include KR molten iron pretreatment, Converter smelting, LF furnace refining, RH furnace refining, continuous casting and rolling. The invention completes the composition design and mass production of the low-temperature steel bar at a relatively low cost, and achieves the effects of strictly controlling impurity elements, inclusions and surface quality, and reducing low-temperature brittleness.

The invention discloses a high-viscosity asphalt and a preparation method thereof. It is composed of base asphalt, epoxy resin and additives. The additives are prepared from the following raw materials 1 and 2: the raw material 1 consists of the following components in weight percentage Composition: aluminum slag powder 1~3%, steel slag powder 25~30%, alkali slag powder 25~40%, activated waste concrete powder 30~45%, the raw material 2 is water, and the weight of the water is the weight of the raw material 1 20-30% of the total weight of each component; in the high-viscosity asphalt, the weight percentage of each component is: 88-96% of base asphalt, 1-5% of epoxy resin, and 3-7% of additives; the present invention High-viscosity asphalt has the characteristics of low low-temperature brittleness, high durability and weather resistance, and high viscosity at 60°C.

The invention relates to a copper alloy material and a preparation method and application thereof. The copper alloy material comprises, by weight, 0.2-0.8 part of lead, 0.5-1.2 parts of nickel, 0.01-0.2 part of phosphorus, 0.01-0.5 part of titanium, 0.05-0.5 part of stannum, and 96.7-98.8 parts of copper. The copper content of the copper alloy material is greater than 97%, methods of aging strengthening, deformation strengthening, microelement alloying strengthening are comprehensively adopted, and the alloy material with high strength and high electric conduction is obtained. The alloy has nomagnetism and no low-temperature brittleness, the abrasion resistance is high, the corrosion resistance is high, sparks does not occur by impacting, requirements of copper alloy used for high-power connectors in industries such as transportation, aerospace and communications are met; and the alloy is easy to turn and applicable for high-speed automatic lathe machining.

The invention relates to a permanent asphalt pavement anti-skid wear layer, comprising: high-performance aggregate, ordinary aggregate, and asphalt mixture; wherein, the polishing value of the high-performance aggregate is ≥ 50, and the wear value is 13-18%. ; The polishing value of the common aggregate is >42 and <50, and the abrasion value meets the specification requirements. The present invention blends high-performance aggregates and ordinary aggregates, and the ordinary aggregates and high-performance aggregates have a tight intercalation force, which increases the overall skid resistance of the road surface. As the use time increases, the performance of the high-performance aggregates The polishing value remains almost unchanged, and the performance indicators measured on the road surface, such as the swing value and the depth of the structure, have little attenuation change. The anti-slip performance of the road surface is extended, the driving safety is greatly improved, and the durability is also improved.