44results about How to "Improve heat and wear resistance" patented technology

The invention belongs to the technical field of metal surfacing materials and particularly relates to a heat-resisting and wear-resisting flux-cored wire. The heat-resisting and wear-resisting flux-cored wire is formed by wrapping a low-carbon cold-rolled steel strip on flux core powder. The flux core powder comprises, by weight, 0.25-1.0% of graphene, 40-45% of chromium metal, 5-9% of electrode graphite, 2-4% of marble, 1-3% of chromium carbide, 1-4% of electrolytic manganese metal, 3-6% of silicon iron, 4-6% of molybdenum, 6-10% of nickel, 2-4% of ferro-boron, 0.5-3% of niobium, 0.5-3.0% of tungsten, 0.5-1% of rare earth, and the balance FHY100.25 reduced iron powder. According to the heat-resisting and wear-resisting flux-cored wire, weld metal structures are refined and homogenized by adding components such as graphene, rare earth elements and chromium carbide into the flux core powder and optimizing the reasonable range of components, and the high-temperature tempering stability of surfacing metal is improved.

The invention relates to a preparation method of a heat-resistant and wear-resistant alloy coating on the surface of a wrapper roll of a hot rolling sheet, which is characterized by comprising the following steps of: 1) pre-treating the surface of the wrapper roll; 2) selecting alloy powder and adjusting an automatic powder sending device; 3) adjusting a light beam: selecting a broadband integral mirror with the size of 10*1 mm; and adjusting a defocusing distance so that a focal laser spot is rectangular; 4) carrying out laser cladding on the heat-resistant and wear-resistant coating: selecting a DL-HL-T5000 type CO2 laser, wherein an operating platform is a SIMENS CNC (Computerized Numerical Control) laser processing machine; automatically sending the alloy powder into a laser weld crater by a synchronous powder sending device; axially feeding along the wrapper roll by a high-power focal laser beam and an automatic powder sending head; and rotating at a revolving speed so that a uniform and compact laser cladding is formed on the processing surface of the wrapper roll; and 5) carrying out flaw detection after cladding. In the invention, the hardness, the wear resistance and the capability of resisting contact fatigue of the surface of the wrapper roll of the hot rolling sheet can be obviously improved through a strengthened layer formed by the laser cladding.

The invention discloses a processing technology for a high-abrasion-resistance aluminium alloy foaming mould casting, and the processing technology comprises the following four steps of: burdening, smelting, casting and carrying out heat treatment. According to the processing technology disclosed by the invention, appropriate amounts of rare earth elements such as Y, Pr and Nd are added in aluminium alloy, the content of hydrogen in the aluminium alloy is reduced, and the plasticity, heat resistance, abrasion resistance and high temperature strength of the aluminium alloy are improved. An aluminium alloy refrigerator foaming mould casting processed by adopting the processing technology disclosed by the invention has the advantages of good mechanical properties, high strength, good heat resisting property, good usability, good internal structure compactness, no pore or peeling, high abrasion resistance, high oxidation resistance, low expansion coefficient and the like.

The invention discloses a modified asphalt coiled material forming and thickness control device capable of preventing tire bases from being broken by blowing, The forming and thickness control device comprises two thickness-adjusting devices which are arranged in an up-and-down opposite mode. The forming and thickness control device is characterized in that the two thickness-adjusting devices are both of a wedged structure, the front ends of the two thickness-adjusting devices are arranged oppositely to each other, a first gap is arranged between the two thickness-adjusting devices, the first gap is the input end of the forming and thickness control device, a second gap is arranged between the rear ends of the two thickness-adjusting devices, the second gap is the output end of the forming and thickness control device, and the first gap is less than the second gap. Due to the wedged structures, a tire-containing coiled material after being provided with a coating material is smoother, and more uniform in thickness. A thickness-adjusting roller can be made of engineering ceramics, so that the heat resistance and wear resistance of the device are better. Therefore, the forming and thickness control device disclosed by the invention has the advantages that the device can prevent tire bases from being broken by blowing; the tire-containing coiled material after being provided with the coating material is smoother, and more uniform in thickness.

This high performance hot-work die steel accounting for weight has following chemical composition: C: 0.70-1.98,Si:0.30-1.50,Mn:0.20-0.70,Cr:0.80-2.00,W:0.80- 1.40,Mo:1.00-1.80,Ni:1.00-3.00,V:0.30-1.20,Bi:0.01-0.02,rare earth Si and Mg:0.05-0.08,P<0.03,S<0.03, the rest is Fe and inevitable impurity. The HRC hardness of it can be adjust by need from 20-60 degree, through the way of heat treatment such as annealing and quenching. The invention has enough mechanical strength and toughness, super ordinary thermal oxidation resistance and cold-heat impact resistance, heat resistance, wear resistance, and aluminium liquid resistance. After process into die, not need surface treatment of 'nitriding', just need quenching and tempering for needed hardness.