62results about How to "Improve thermohardness" patented technology

The invention discloses a heat treatment process of high speed steel for a cutting tool. The heat treatment process comprises the following steps: (1) heating in stages, to be more specific, in the first stage, heating to the temperature of 550-560 DEG C with the holding time of 20-30 minutes; in the second stage, heating to the temperature of 820-840 DEG C with the holding time of 30-40 minutes, in the third stage, heating to quenching temperature of 1070-1090 DEG C with the holding time of 60-90 minutes; (2) quenching by oil cooling; (3) tempering with the tempering temperature of 505-515 DEG C with the holding time of 90-120 minutes, then cooling by air to room temperature; and performing the tempering treatment for two times by the process.

The invention relates to a shield adhesive and a preparation method thereof. The shield adhesive comprises the following raw materials by weight: 90 to 110 parts of a chloroprene rubber adhesive, 50 parts of acrylic acid ester, 1 to 3 parts of organosilicon, 40 parts of a phenolic resin, 4 to 8 parts of nanometer magnesium oxide, 100 parts of a solvent, 0.22 to 0.44 part of a catalyst, 1 to 1.5 parts of an initiator, 1 to 1.5 parts of a terminator and 20 to 40 parts of a fire retardant. According to the invention, A90 and A30 are added into the sliced chloroprene rubber adhesive for blending to improve heat resistance of the sliced chloroprene rubber adhesive, and then an obtained mixture and acrylate undergo ternary polymerization. The shield adhesive provided by the invention has high bonding strength and strong high temperature resistance and is applicable to subways, underground roads and tunnels at the bottom of a sea (a river or a lake).

A laser cladding or plasma transferred arc overlay welding process may be used advantageously to apply and to control the material properties of a coating designed for protecting the substrate against wear, corrosion and oxidation at elevated temperature. Furthermore, a laser cladding or plasma transferred arc overlay welding process may be used to apply the coating alloy materials in applications where traditional thermal spray or weld-applied coatings are not practical. By using these welding methods very good bonding is achieved by fusion during welding. At the same time the properties of the clad layer is preserved by the limited dilution typical of these two welding methods compared traditional overlay welding, by e.g. Gas Tungsten Arc Welding and the like.

The invention discloses a production technique of an antifatigue aluminum alloy section. The alloy comprises the following elements in percentage by mass: 3.5-4.2% of Cu, 1.2-1.8% of Mg, 0.4-0.8% of Mn, 0.10-0.15% of Zn, 0.1-0.2% of,Sb0.2-0.3% of Ti, 0.35-0.45% of Zr, 0.08-0.12% of Fe, 0.04-0.06% of Si, 0.03-0.05% of Ge, 0.02-0.03% of Bi, 0.04-0.08% of RE, 0.002-0.003% of B and the balance of Al. The contents of Fe, Si and other impurity elements are lowered to improve the fracture toughness, fatigue resistance and stress corrosion resistance of the alloy; and the rare earth metal elements, including Pr, Nd and La, in the modifier can form high-thermohardening-property complex component compounds in the aluminum alloy which are reticularly distributed on the grain boundary or among the dendrite, thereby refining the structure, effectively preventing the base transformation and movement of crystal boundaries, and further obviously enhancing the high temperature properties of the alloy.

This invention relates to new style alloy high-speed steel, especially relates to new style chrome steel system high-speed steel and its heat treatment technique. The weight percentage of the elements is that carbon 0.85-1.05%, silicon 0.2-0.4%, manganese 0.2-0.4%, chrome 9.0-11.0%, tungsten3.5-4.5%, molybdenum 0.6-2.0%, vanadium 0.4-2.0%, nickel 0.1-0.3%, cobalt 0.3-5.0%, niobium 0.8-1.8%, sulfur not more than 0.015%, phosphor not more than 0.02%, the rest is iron. Compared to home made die steel, the toughness and wear resistance of the high-speed steel in this invention is enough, it can be used to make all kinds of cold die, cutting tool, cutlery, and the production cost is low. This invention also provides the heat treating technique of the high-speed steel.

The invention provides a heat treatment process improving the hot hardness and the high temperature abrasion resisting performance of hot mold steel. Charcoal, urea particles, sodium carbonate powderand chromic anhydride are mixed to obtain a carbon-nitrogen strong permeating mixture; a hot mold steel workpiece and the carbon-nitrogen strong permeating mixture are installed in a permeating box atthe same time, and a box cover of the permeating box is sealed; the permeating box is placed into a crucible type electric furnace to be subjected to constant temperature carbon-nitrogen strong permeating at 850-950 DEG C; after quenching treatment, the hot mold steel workpiece is directly immersed into quenching oil to be cooled; and after air cooling, placing into a box type intermediate temperature tempering furnace for tempering twice is performed, and the hot mold steel workpiece high in hot hardness and high in high temperature abrasion resisting performance is obtained. The heat treatment process has the advantages of being easy and convenient to operate, low in cost and obvious in effect, the surface hardness of the obtained hot mold steel can reach 62 HRC or above, the high temperature abrasion resisting performance under the temperature of 600 DEG C exceeds that of a same hot mold steel conventional heat treatment piece twice or above, and the service life of a hot working mold can be effectively prolonged.

The invention discloses a heat-resistant aluminum alloy containing Mo-Be and a preparation method of the heat-resistant aluminum alloy containing Mo-Be and belongs to the field of metal material engineering. The heat-resistant aluminum alloy containing Mo-Be is prepared from, by mass percent, 6%-7% of Cu, 0.5%-0.7% of Mn, 0.5%-0.7% of Ni, 0.3%-0.4% of Cr, 0.3%-0.4% of Be, 0.3%-0.4% of Mo, 0.2%-0.3% of V, 0.15%-0.25% of Ti, 0.01%-0.015% of B, 2.5%-3% of Ce, 1.5%-2% of La and the balance Al and inevitable impurities. The preparation method includes the steps that firstly, an aluminum and chromium intermediate alloy is molten, after other intermediate alloys and aluminum are added, a covering agent is added, slag is pushed aside after heat preservation, an aluminum refining agent is added, and slag is separated after heat heat preservation; secondly, casting is performed; and thirdly, cast blanks are subjected to solid solution and aging treatment. According to the alloy, due to multi-element alloying, the component range of the alloy is adjusted, high-temperature strength and high-temperature lasting performance of the alloy are remarkably improved after heat treatment, and the highest transient tensile strength reaches 260 MPa-270 MPa at 250 DEG C. Tensile strength ranges from 233 Mpa to 238 Mpa after heating is performed at 200 DEG C for 200 h, and tensile strength ranges from 187 Mpa to 195 Mpa after heating is performed at 250 DEG C for 200 h.

A steel for metal-cutting tools comprising carbon, chromium, molybdenum, vanadium, aluminum and nitrogen in certain concentration ranges. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.

The invention discloses a powder-metallurgic valve seat ring of a CNG engine, which is composed of, by mass, 3.5-4.5% of Co, 12-15% of Cu, 6-7.5% of Mo, 0.5-1.2% of Ni, 4.5-5.5% of Cr, 2.5-3.5% of W, 0.2-0.3% of Y2O3, and the balanced being a base material, iron. The valve seat ring is produced through the process of solid phase alloying sintering, wherein nitrogen gas and cracked ammonia gas are fed as a protective atmosphere. A copious cooling tempering process is used in thermal treatment. The valve seat ring is improved in toughness, wear resistance, thermal hardening property, thermal conductivity and coefficient of linear expansion under constant high temperature. Density of the valve seat ring is improved by controlling effective sintering temperature and sintering rate.

The invention relates to a novel high-speed steel. The novel high-speed steel comprises, by weight, 0.9 to 1.2% of C, 0.21 to 0.5% of Si, 0.18 to 0.3% of Mn, 9.5 to 12.0% of Cr, 4 to 4.8% of W, 0.55 to 2.2% of Mo, 0.5 to 2.2% of V, 0.05 to 0.2% of Ni, 0.25 to 4.0% of Co, 0.7 to 2% of Nb, no more than 0.01% of S and no more than 0.01% of P, with the balance being Fe. The novel high-speed steel provided by the invention has sufficient toughness and wear resistance, is applicable to preparation of a variety of cold-punching moulds, cutting elements and cutters and is low in production cost.

The invention relates to an adjusting-type plug valve which comprises a valve body, a valve rod, a valve core, a valve seat, a valve rod screw plug and a driving handwheel. An inlet runner and an outlet runner are arranged on the valve body, the valve core is fixedly connected at the bottom end of the valve rod, the valve seat is arranged below the valve core in a clingy manner, the valve rod screw plug is arranged on the valve rod in a sleeved manner, the driving handwheel is rotatably connected on the valve rod, each of the inlet runner and the outlet runner of the valve body is arranged obliquely, position of the inlet runner is lower than that of the outlet runner, an oblique through hole capable of being communicated with the inlet runner and the outlet runner is formed in the valve seat and obliques from the middle portion of one end away from the valve core to the outer side of one end close to the valve core, and section shape of the valve core is matched with one side, close to the valve core, of the oblique through hole in the valve seat. The adjusting-type plug valve is simpler in structure and higher in sealability, and has a better flow adjusting function.

The invention provides a formula of a welding rod coating. The formula consists of marbles, quartz, ferrosilicon, ferromanganese iron, calcium carbonate, potassium carbonate, sodium silicate, starch, aluminum oxide, cryolite and sodium silicate. The formula has the beneficial effects that: the problem that a welding seam is liable to corrode after a welding rod is used for welding is solved, tensile strength and impact toughness of a welding seam are strengthened, a brittle transition temperature of the welding seam is reduced, thermal hardness of the welding seam is improved, and surface hardness of the welding seam is strengthened. Moreover, the formula is low in production cost, simple in manufacturing process, wide in scope of application and easy to popularize.

The invention relates to the technical field of coatings, and provides a wear-resistant coating for a stone roll surface and a preparation method thereof. The wear-resistant coating solves the problems that an existing stone roll has short service life, the surface of dewatered paper is rough, and the dehydration efficiency is low. The wear-resistant coating comprises a first coating covering theroll surface and a second coating arranged on the first coating, wherein the first coating comprises the following raw materials according to the parts by weight: 65 to 72 parts of alumina, 10 to 15 parts of titanium dioxide, 6 to 8 parts of yttrium oxide, 3 to 7 parts of cobalt, 4 to 6 parts of nickel, 2 to 4 parts of manganese, 2.4 to 3.2 parts of glass powder, 1.2 to 1. 8 parts of artificial diamond, and 1.5 to 2 parts of molybdenum disulfide; and the second coating comprises the following raw materials according to the parts by weight: 48-60 parts of organic silicon resin, 1-3 parts of coupling agent, 1.8 to 2.5 of toughening agent, 3 to 5 parts of silicone oil, 4 to 8 parts of polytetrafluoroethylene, 2.5 to 3.5 parts of polyvinyl butyral, 2 to 7 parts of talcum powder, 0.9 to 1.6 ofantioxidant, 8 to 12 parts of filler, and 15 to 20 parts of trimethyl hexamethylene diamine.

The invention provides Fe-Be-contained heat-resisting aluminum copper alloy and a manufacturing method of the Fe-Be-contained heat-resisting aluminum copper alloy, and belongs to the field of metallic material engineering. The Fe-Be-contained heat-resisting aluminum copper alloy comprises, by weight percentage, 6%-7% of Cu, 0.5%-0.7% of Mn, 0.5%-0.7% of Ni, 0.3%-0.4% of Cr, 0.3%-0.4% of Fe, 0.3-0.4% of Be, 0.2%-0.3% of V, 0.15%-0.25% of Ti, 0.01%-0.015% of B, 2.5%-3% of Ce, 1.5%-2% of La and the balance Al and inevitable impurities. The manufacturing method includes the steps of firstly, smelting, wherein an aluminum-chromium intermediate alloy is added to be molten and cooled, other alloys and aluminum are added in the form of the intermediate alloy, a covering agent is added, and an aluminum refining agent is added after the temperature is constant; secondly, casting; and thirdly, solid solution and aging treatment. According to the Fe-Be-contained heat-resisting aluminum copper alloy, the room temperature, the high-temperature strength and the high-temperature permanence performance are improved remarkably after the Fe-Be-contained heat-resisting aluminum copper alloy is subjected to multi-alloying and heat treatment; the instant tensile strength is as high as 258 MPa to 264 MPa at the temperature being 250 DEG C; and the tensile strength ranges from 213 MPa to 223 MPa after the alloy is heated for 200 hours at the temperature being 200 DEG C, and the tensile strength ranges from 185 MPa to 192 MPa after the alloy is heated for 200 hours at the temperature being 250 DEG C.

The invention discloses carbon-free high-speed steel and a preparation method thereof. According to the carbon-free high-speed steel provided by the invention, iron powder is introduced to replace molybdenum powder and cobalt powder, and a small amount of LaB6 is introduced to improve the tempering resistance and red hardness of the material; and through joint addition of La and B, strengthening is caused, austenite transformation is delayed, structure coarsening and desolvation of alloy elements during tempering are inhibited, so that the red hardness and the hot hardness of the Fe-Co-Mo material are improved. Meanwhile, a preparation process is simple, the cost of the raw materials is reduced, the excellent cutter material performance is shown, and a prepared cutter can keep high hardness and is not sticky under the long-time cutting action, and important application value in the industry is achieved.

Compared with domestic steel W6Mo5Cr4V2, the steel material of the present invention replaces a large amount of molybdenum with chromium, which saves the usage of molybdenum, and also reduces the usage of vanadium and tungsten, thereby reducing the production cost of alloy steel; adding non-carbide elements Nickel improves the strength of steel through solid solution strengthening, and at the same time has high plasticity and toughness, and strongly increases the hardenability of steel, and the addition of cobalt greatly improves the hot hardness and cutting performance of alloy steel; adding The carbide forming element niobium increases the toughness of the steel and improves the processability of hot working. The content of P and S in the present invention is very low (especially P), so the purity of the steel is particularly good, and it plays a role in guaranteeing various properties of the steel. The annealed Brinell hardness of the steel reaches HB250. Therefore, the steel of the invention has high thermal hardness and cutting performance, and also has high toughness and wear resistance. However, the material cost is much lower than the domestic steel W6Mo5Cr4V2, which is suitable for making various vehicle shafts.

The invention discloses a high-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring. The high-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring is made from, by weight, 6.2-6.4 parts of chrome, 4.2-4.4 parts of cobalt, 0.7-0.9 part of nickel, 0.5-0.7 part of titanium, 0.3-0.5 part of cerium, 18-19 parts of copper, 1.2-1.5 parts of nano molybdenum disulfide, 0.7-0.9 part of tungsten carbide, 1-2 parts of manganese dioxide, 0.4-0.6 part of methyl triethoxy silane, 2.1-2.4 parts of ferro boron powder, 0.2-0.4 part of aluminum dihydrogen phosphate, 2-3 parts of polytetrafluoroethylene powder and 64-68 parts of iron. According to the high-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring, the surface of the modified nano molybdenum disulfide is covered with a layer of copper film to be added into a matrix material as a solid lubricating agent; and meanwhile, manganese dioxide, titanium, cerium and other elements are added, the sintering, melt infiltration and heat treatment process is adopted to change the phase change of metal particles, and the manufactured product has high hardness and high high-temperature stability.