51results about How to "High Rockwell hardness" patented technology

A method to manufacture a steel die having a Physical Vapor Deposition wear resistant coating on a profile surface and a steel die formed thereby is disclosed. The steel die is subjected to quenching and tempering to achieve a Rockwell hardness in the range of about 40-45 Rc and then subjected to machining to form a profile surface. The surface is then subjected to Physical Vapor Deposition of a wear resistant coating that may be multiple layers of CrN, AlCrN, TiCrN, TiN, TiCN or TiAlN, and preferably is alternating layers of TiN—TiCN—TiN. The coating is applied at a sufficient thickness to impart wear resistance to the steel die. The steel dies are useful in sheet metal stamping operations.

The invention discloses a method for manufacturing cemented carbide, which specifically belongs to the field of alloy manufacturing, and is carried out according to the following steps: S1 batching; S2 wet grinding and sieving; S3 drying: the sieved mixture is preliminarily dried using a vacuum steam drier, and Add molding agent gasoline solution during the drying process, the preliminary drying temperature is 60-100°C, and the drying time is 3-10h; use a steam drying cabinet to dry the mixture powder at a temperature of 100-150°C for no less than 0.5h ; S4 compression molding; S5 sintering: sintering the compression-molded mixture powder using five-stage temperature programming; S6 post-processing. The invention discloses a cemented carbide. The manufacturing method of the cemented carbide provided by the present invention controls the temperature in the sintering process to process the cemented carbide with the Rockwell hardness HRA increased by at least 6, the sintering temperature decreased by at least 800°C, and the compressive strength increased by at least 200MPa.

The invention relates to high-temperature-resistant and high-toughness hot work die steel and a preparation method thereof. The hot work die steel is mainly composed of, by mass, 0.50-0.65% of C, 0.7-1.3% of Si, 0.6-1.0% of Mn, 2.5-4.5% of Cr, 2.7-4.5% of Mo, 0.5-1.1% of V, 0-0.02% of P, 0-0.0005% of S, and the balance Fe. According to the hot work die steel, the use amounts of all components of H13 die steel are improved, so that the weight percentage of C is increased to 0.50-0.65%, the weight percentage of Mn is increased to 0.6-1.0%, the content of Cr is decreased to 2.5-4.5%, and the weight percentage of Mo is increased to 2.7-4.5%; and the four chemical components are adjusted at the same time, the optimal proportion is achieved, and accordingly the prepared die steel is excellent in hardness and high-temperature resistance and high in toughness.

The invention discloses a modified SEBS (styrene-ethylene / butadiene-styrene block copolymer) alloy and a preparation method thereof. The SEBS alloy is prepared from the following components in parts by weight: 80-100 parts of styrene block copolymer, 2-5 parts of white oil, 25-35 parts of polyolefin elastomer and 30-40 parts of antimony chromate / titanium dioxide nano composite material, wherein the antimony chromate / titanium dioxide nano composite material is synthesized by antimony nitrate, ammonium metachromate, 3-nitro-1, 2, 4- triazole-5-ketone and nano TiO2. According to the invention, the antimony chromate / titanium dioxide nano composite material is added, thus, degree of crystallinity of the SEBS alloy material is improved, and flexural modulus, hardness, tensile strength and other properties of the modified SEBS alloy are all improved to a greater extent.

The invention provides a preparation method of a ceramic particle metal composite material. The preparation method comprises the following steps that ceramic particles are subjected to surface pretreatment and then placed into a chemical plating solution, and thus nickel-plated ceramic particles are obtained; an electric heating resistance wire is used for cutting a foam plate; the nickel-plated ceramic particles are washed and dried, and then coats the surface of a foam specimen, after drying, the foam specimen is bonded with a cross gate, a sprue and an ingate, and thus a lost foam casting white foam is obtained; the prepared lost foam casting white foam is placed into a sand box filled with dry sand, the dry sand is vibrated to be compacted and scraped to be flat, a plastic thin film isused for covering, a pouring cup is placed, and the negative pressure is pumped; after the dry sand is firm and is formed, metal liquid is cast; and after casting, vacuum relief, cooling and solidification then polishing are conducted. According to the preparation method of the ceramic particle metal composite material, the Rockwell hardness, impact toughness and overall abrasion resistance of the prepared composite material are greatly improved, no element diffusion exists between the ceramic particles and a metal substrate at the composite interface, and the bonding strength between the ceramic particles and metal is high.

The invention discloses an iron-based amorphous coating and a preparation method of the iron-based amorphous coating through a plasma surfacing method. Alloy powder is prepared after being made up according to a specific proportion, and an alloy coating is formed on the surface of a substrate through surfacing conducted by a plasma surfacing machine, and technological parameters are as follows, the welding voltage is 25-30 V, the welding current is 140-200 A, the welding speed is 35-40 mm / min, the shielding gas flow speed is 10-12 L / min, the powder feeding speed is 15-25 g / min, and the swing amplitude is 20-30 mm; and after the plasma surfacing is completed, the coating is awaited to be naturally cooled to the room temperature, and the preparation of the iron-based amorphous coating is completed. An iron-based surfacing coating prepared through the plasma surfacing method is high in hardness, good in abrasion resistance, and can be widely applied to the manufacturing and restoring of metallurgical machinery and petrochemical equipment. In addition, the plasma surfacing method for preparing the coating is simple in process, easy and convenient to operate and free of weld preheating and post-weld slow cooling; the coating after being subjected to the surfacing is free of cracks and peeling, and the coating is formed well.

The invention provides 4Cr3MoWVNi (B3R) hot work die steel with high strength and toughness and resistance to tempering, and a preparation process thereof. Raw materials for preparing the B3R hot work die steel comprise, by weight, C 0.35 to 0.42%, Si 0.15 to 0.35%, Mn 0.3 to 0.5%, Cr 2.50 to 3.50%, Mo 1.00 to 1.50%, W 0.50 to 0.80%, V 0.50 to 0.80%, Ni 1.45 to 1.85%, S 0.003 to 0.010% and P 0.008 to 0.018%, with the balance being Fe. The preparation process comprises the following steps: smelting at intermediate frequency--remelting (refining) of electroslag-diffusion hydrogen of electroslagingots, annealing treatment of electroslag ingots--forging--annealing of forging stocks--rough machining--vacuum heat treatment, and secondary tempering so as to obtain the novel product of die steel. The hot work die steel prepared in the invention has high Rockwell hardness, excellent impact toughness and tempering (thermal fatigue) resistance, and the advantages of optimized collocation of components, pure steel quality, a uniform structure, high strength, strong toughness, good tempering resistance, etc.

The invention relates to a strength reinforced and antifriction ultrahigh molecular weight polyethylene composite material. The composite material comprises ultrahigh molecular weight polyethylene and superfine inorganic powder. The composite material adopts the coupling agent processed superfine inorganic powder for filling, and is prepared through solid phase grafting technology, thereby obviously improving the compatibility of components and functionally modifying the surface of the composite material. The solid phase grafting technology has little solvent consumption, simple production equipment, convenience for the industrialized production, and good development prospect.