363 results about "Nickel Chromium Alloys" patented technology

A superfine or nano-class metallic powder clad composite powder is composed of a core particle made of the metal (Ni or stainless steel), the carbide (tungsten carbide or chromium carbide), alloy (NiCr), self-smelting alloy (NiCrBSi), or their composition, and a cladding layer made of superfine or nano-class metal particles (Al, Mo, or Co). It can be used for hot spray coating or powder metallurgy. Its preparing process is also disclosed.

The invention provides a non-magnetic heating device for a nuclear magnetic resonance gyroscope. The device consists of a heating body, a heating wire, a heat insulating framework and magnetic compensation coils, wherein the heating body is made of a non-magnetic high-heat-conductivity material, and is of a hollow structure; an atomic gas chamber is placed into the heating body for being uniformly heated; the four faces of the outer side of the heating body are provided with heating grooves; the nickel-chromium alloy non-magnetic heating wire can be placed into the heating grooves positively or reversely, thereby constructing a spatial symmetrical non-magnetic heating structure under the constraints of the heating grooves; after the heating body and the heating wire are fixedly assembled, the combination is fixed in the polytetrafluoroethylene heat insulating framework; three groups of winding grooves are formed in the heat insulating framework for winding enameled wires, thereby constructing three groups of orthogonal Helmholtz magnetic compensation coils for compensating a residual magnetic field. Compared with the prior art, the non-magnetic heating device has the advantages of compact structure, easiness in assembly, easiness in implementing engineering, high heating uniformity, high heating efficiency and high heating magnetic field counteracting capability.

A kind of high temperature alloy group self-lubricating compound material and the method to pattern surface of it. The components and the mass percent of them are as following: Ni: 28.8-56.8%, Fe: 10.0-30.0%, Cr: 7.2-14.2%, W: 5.0- 15.0%, C: 3.0-6.0%, Si: 0.8%-1.2%, MoS2: 5.0%-15.0%. The method to pattern it' s surface contains the following steps: The surface of the nickel chromium alloy group self-lubricating compound material sample after being hot pressed and mould will be polished. A gammaray laser will be used to corrase micropore on the surface, the focus of the focusing lens will be adjusted to 40-60mm, the facula diameter at the focus is 0.15- 0.20mm, the impulse duration will be adjusted to 450-500ns, the laser bean will process micropore according to ring shape from outside to inside. The surface after being corrased and polished will be lubricated by daubing the fat of solid layered dry lubricant. The alloy group material not only owns high mechanical strength but also owns high temperature self-lubricating ability. The coefficient of friction can be decreased, the application life can be prolonged, and low attrition abrasion in wide temperature range can also be realized by patterning the surface.

The invention relates to a preparation method of nickel-chrome alloy steel, which comprises the following steps of ore sintering, sinter smelting, refining and casting; the iron-containing ore material comprises, on a weight basis, 10-100% of laterite-nickel ore and 0-90% of iron ore. The invention also relates to the alloy steel obtained by the preparation method, and alloy steel bars obtained by the alloy steel through further rolling. The invention adopts cheap laterite-nickel ore resources instead of the whole or part of the iron ore resources for the preparation of the alloy steel and steel bars; not only a lot of iron in the laterite-nickel ore is effectively used, but also the nickel, chromium elements in the laterite-nickel ore are made full use of; the production process is simplified; the cost is reduced; and the performance of the steel is significantly improved.

An air data probe is disclosed. The air data probe may include a probe body having an interior cavity and coated by a protective shell. A sensing port may be disposed in the air data probe and may extend through the probe body. The sensing port may also be lined by the protective shell. The protective shell may be made of an austenitic nickel-chromium alloy, or stainless steel, or any relatively corrosion resistant material. The probe body may be made of nickel, or a nickel alloy, or any relatively thermally conductive material. The protective shell may be joined to the probe body by additive manufacturing, such as laser cladding. In this manner, an air data probe capable withstanding high temperatures without corrosion and yet also being relatively thermally conductive is disclosed.

The invention relates to powder material for boiler tube high temperature resistance and wear resistance protecting and a preparation method thereof, and belongs to the technical field of surface engineering. The power material comprises the following components, by weight percentage, 10-20% of titanium-nickel alloy powder, 1.5-3.5% of graphite powder, 0.5-1% of silica powder, 8-25% of nickel-chromium alloy powder Ni80Cr20, 5-10% of iron boride powder and the balance of tri-chromium dicarbide powder. The preparation method comprises the following steps that power material is prepared, mix powder is formed, liquid-containing binders are prepared, sizing agents are prepared from the mix powder, prilling is completed through spray drying, and finished product powder is prepared from screening the prilling powder and is used for preparing a cladding layer. The metal cladding layer with high wear resistant duplex ceramic is formed through laser cladding, and the hardness ranges from 1100 HV to 1600 HV, so that the powder material for boiler tube high temperature resistance and wear resistance protecting and the preparation method thereof has the advantages that efficiency of the laser cladding is higher, loss of powder spattering is low, grain of the cladding layer is tiny, wear resistance of the cladding layer is high and the like.

A process for reducing residual tensile stresses in high nickel-chromium alloy nozzle safe-end welds of pressurized water reactor nuclear pressure vessels such as are found at the reactor vessel inlet and outlet nozzles and the pressurizes surge, spray, safety and relief nozzles. The process involves the application of radial compression on the outside surface of the nozzle's safe-end and / or connecting coolant piping, to reduce the outside diameter at the mid-point of the piping element to which the load is applied to between about 0.2% and about 3%. The radially compressive load applied by this process is imparted using a mechanical device that can be employed at the vessel manufacturer's facility or at a nuclear power plant after welding of the nozzle safe-end to the coolant piping or before either after plant commissioning of operation.