5 results about "Nicr alloy" patented technology

The application relates to the technical field of NiCr alloy surface modification, in particular to a Ni20Cr alloy and a preparation method and application thereof. The method comprises the following steps: annealing treatment is performed on a Ni20Cr alloy base material to obtain annealed Ni20Cr alloy, then surface pretreatment is performed to obtain recrystallized Ni20Cr alloy; subsequently, deep cold ultrasonic shot blasting treatment is performed on the recrystallized Ni20Cr alloy to obtain the Ni20Cr alloy. By constructing a gradient nanotwin structure on the surface of the Ni20Cr alloy, the mechanical properties and high-temperature oxidation resistance are synergistically improved. The gradient nanotwin structure not only endows the Ni20Cr alloy with excellent strength-plasticity matching, but also exhibits significant oxidation resistance in a high-temperature service environment, and the problems existing in the prior art are overcome.

Surface Heating Element and Manufacturing Method. This invention relates to a surface heating element that generates heat using electricity and a method for manufacturing the same. One embodiment of the invention provides a surface heating element comprising a NiCr alloy, having an adhesion strength of 3N or more relative to a substrate or insulating layer, and a resistivity of 10⁻⁶. ‑4 Ωcm to 10 ‑2 With a strength of Ωcm, this surface-type heating element can be used even at high operating temperatures above 400°C. It suppresses material release, has high fracture toughness, low coefficient of thermal expansion, and heat resistance, thereby improving product reliability and lifespan.

The application relates to the technical field of alloy coating materials, and particularly discloses a high-pressure hot-pressing die oxidation-resistant coating and a preparation method thereof. The high-pressure hot-pressing die oxidation-resistant coating comprises a transition layer and a functional layer arranged outward from a die base body, the transition layer is a TiN-SiC gradient composite layer, the functional layer takes Al2O3-NiCrAlY as a base body, and is compounded and doped with double-modified nano ZrB2 and rare earth CeO2; the double-modified nano ZrB2 is ZrB2 particles coated with a silane coupling agent KH-560 and a NiCr alloy. The high-pressure hot-pressing die oxidation-resistant coating has oxidation resistance and wear resistance, and effectively enhances the high-temperature hardness stability and wear resistance of the oxidation-resistant coating.

The application relates to the technical field of mechanical transmission devices, in particular to a high-wear-resistance crankshaft and a 3D printing preparation method thereof. The crankshaft comprises a crankshaft eccentric shaft crank, a counterweight connecting disc between the shaft cranks, a crankshaft eccentric shaft bearing positioning table, a large gear ring mounting table and a load bearing mounting table, adopts a composite structure of a 40CrNiMoA / 17-4PH high-strength base matched with a 3D-printed wear-resistant layer, deposits WC-Co hard alloys or Cr3C2-NiCr alloy wear-resistant layers on key working surfaces respectively, and the preparation process comprises base preparation, 3D-printed wear-resistant layer deposition, sand blasting treatment and special heat treatment and finishing suitable for different production requirements, and the core process parameters of each procedure are optimized; the application solves the problems of traditional crankshafts, such as easy stress concentration, fast wear and short service life, the wear rate of the wear-resistant layer is reduced to below 0.02 mm / 1000h, the service life of the crankshaft is prolonged to above 20000h, the performance and cost are considered, and the application is suitable for various transmission working conditions and gear specifications.