44results about How to "Improve thermal oxidation resistance" patented technology

The invention relates to wear-resistant steel and belongs to the technical field of metal smelting. The wear-resistant steel is prepared from the following components in percent by mass: 0.88-0.94% ofC, 0.20-0.30% of Si, 0.90-1.00% of Mn, 0.50-0.60% of Cr, 0.20-0.60% of W, 0.10-0.25% of V, 2.50-3.00% of Zr, 0.010-0.050% of Ti, 0.020-0.050% of Y, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.25% of Cu and the balance of Fe and inevitable impurities. The wear-resistant steel has the beneficial effects that the problems of low strength and poor wear resistance of the existing low-carbon wear-resistant steel is solved; the wear-resistant steel is finer in crystal and fuller in internal density, and a grinding ball prepared by the wear-resistantsteel is larger in hardness and good in wear resistance.

The invention discloses a weatherproof and antibacterial polycarbonate engineering plastic and a preparation method thereof. The engineering plastic is prepared from the following raw materials in part by weight: polycarbonate, weatherproof resin ASA, an antibacterialagent, a flexibilizer, a compatilizer, a dispersing agent, an antioxygen and other aids. The preparation method comprises the following steps: a, respectively performing force air drying on the polycarbonate and the weatherproof resin ASA; b, weighing the antibacterialagent and the dispersing agent, and mixing the two uniformly; c, weighing the flexibilizer, the compatilizer, the antioxygen and other aids, and putting into a super mixer for dry mixing, together with raw materials in step a and step b; and d, putting the mixedmaterials in the step c into a twin-screw extruder, and performing melt extrusion for granulation. The weatherproof and antibacterial polycarbonate engineering plastic has the advantages of ageing resistance, yellowing resistance, good weatherability, and durable antibacterial function.

The invention belongs to the field of metal additive manufacturing, and specifically discloses a non-crack nickel-based superalloy and its composition design method and preparation method. In terms of mass percentage, the composition of the non-crack nickel-based superalloy is: Mo: 10.50%~ 11.00%, Cr: 24.50% to 25.30%, W: 1.00% to 1.50%, Co: 4.00% to 4.50%, Fe: 10.00% to 11.00%, C: 0.05% to 0.08%, Mn: 0.60% to 0.80% , Si: 0-0.30%, the balance being Ni. The nickel-based superalloy can make full use of the rapid solidification effect of the laser selective melting forming technology, which can significantly improve the strength of the GH3536 alloy, and at the same time significantly reduce the micro-crack defects and mechanical properties of the traditional nickel-based superalloy in the laser selective melting forming process. superior.

The invention provides a thermal insulating pipe and a manufacturing method of the thermal insulating pipe. The thermal insulating pipe is composed of a crosslinked polyethylene layer, a polyethylene thermal insulating layer and an ultraviolet radiation resisting polyethylene layer which are arranged from inside to outside in sequence, wherein an electric heating device is arranged between the crosslinked polyethylene layer and the polyethylene thermal insulating layer. Compared with the existing split-type single piece water conveying thermal insulating pipe, the thermal insulating pipe is an integer composed of the crosslinked polyethylene layer, the polyethylene thermal insulating layer, the ultraviolet radiation resisting polyethylene layer and the electric heating device; firstly, the aging resistance performance of the thermal insulating pipe is improved by the ultraviolet radiation resisting polyethylene layer; secondly, as the thermal insulating pipe is an integer, no thermal insulating materials need to be wrapped, so that the use is convenient, and the working quantity during the installation process is reduced; thirdly, as the electric heating device is added, the electric heating can be carried out, so that the liquid is prevented from being refrozen in a low temperature environment; and moreover the crosslinked polyethylene layer is used as the inner layer of a water conveying pipe, and crosslinking can be carried out slowing by using the heat of the liquid, thus the heat-resisting oxidation susceptibility of the water conveying pipe is improved.