4results about How to "Increase solid solution" patented technology

The invention discloses an engine valve guide pipe and a preparation process and application thereof, the valve guide pipe is formed by plating a working surface of a Fe-based alloy matrix by adopting a magnetron sputtering process, and the Fe-based alloy matrix consists of C, N, Co, Cr, Ni, W, Ti, Mn, Al, Cu, V, S, Mo, Mg, Nb, Si, a toughening and cutting additive, a solid lubricant, hard particles and the balance of Fe. The valve guide pipe is prepared through the technological processes of additive preparation, burdening and powder mixing, mold wall lubricating, warm-pressing forming, sintering, siphon copper infiltration, heat treatment, finish machining and magnetron sputtering of the transition layer and the functional plating layer, has excellent hardness and strength and high compactness and further has good corrosion resistance, high-temperature wear resistance and good machining performance, and the service life of the valve guide pipe is prolonged. And the lubricating oil is suitable for working condition requirements including but not limited to hydrogen, natural gas, LPG gas, oil-gas hybrid power, fuel oil engines and the like in environments of high temperature, dry friction, impact, gas corrosion and the like.

The invention discloses a volume-stable high-magnesium Portland cement clinker, a preparation method and high-magnesium Portland cement. The clinker is prepared from the following mineral components in percentage by weight: 45 to 60 percent of C3S, 15 to 25 percent of C2S, 5 to 10 percent of C3A, 10 to 15 percent of C4AF, 2 to 8 percent of Ca3Mg (SiO4) 2 and 0.1 to 1 percent of 3MgO. V2O5. By introducing the vanadium-containing waste catalyst, the sintering temperature of the clinker can be obviously reduced, a 3MgO. V2O5 compound is formed, free magnesium oxide is converted into a combined stable calcium-magnesium compound, the volume-stable high-magnesium Portland cement clinker is obtained, and the autoclaving expansion rate of the cement is less than 0.01% when the content of magnesium oxide in the clinker reaches 4.5-10%.

The application belongs to the technical field of hard alloy, and particularly relates to high-performance hard alloy with dispersed and uniform tantalum carbide and a preparation method thereof. The preparation method comprises the following steps: adding potassium fluotantalate solution into a cobalt-nickel solution; adjusting the pH of the solution to make cobalt, nickel and tantalum completely precipitate, and then filtering, washing with water and drying to obtain cobalt-nickel-tantalum precursors; then reducing, crushing and sieving to obtain precursor powder; mixing the precursor powder with carbon black, tungsten carbide and paraffin, and then wet ball-milling, spray granulating, preparing a compact and sintering to obtain high-performance hard alloy. By adding nickel element, using a liquid-liquid mixing method and reducing, superfine cobalt-nickel solid solution powder is obtained, which can improve the toughness of the alloy; the conversion of tantalum is completed in the sintering process, which is beneficial to the dispersion of tantalum and the strengthening of the alloy performance, improves the solid solution amount of tantalum in cobalt-nickel, inhibits the sintering growth of WC, and improves the hardness and wear resistance of the alloy.

The invention belongs to the technical field of hard alloys, and particularly relates to a high-performance hard alloy with uniformly dispersed tantalum carbide and a preparation method of the high-performance hard alloy. The preparation method comprises the following steps: adding a potassium fluotantalate solution into a cobalt-nickel solution; adjusting the pH value of the solution to completely precipitate cobalt, nickel and tantalum, filtering, washing with water, and drying to obtain a cobalt-nickel-tantalum precursor; then reducing, crushing and sieving to obtain precursor powder; and mixing the precursor powder with carbon black, tungsten carbide and paraffin, carrying out wet ball milling and spray granulation, preparing a pressed blank, and sintering to obtain the high-performance hard alloy. According to the preparation method, by adding the nickel element and using a liquid-liquid mixing method, superfine cobalt-nickel solid solution powder is obtained through reduction, and the toughness of the alloy can be improved; tantalum conversion is completed in the sintering process, tantalum dispersion and alloy performance strengthening are facilitated, the solid solution amount of tantalum in cobalt-nickel is increased, sintering growth of WC is inhibited, and the hardness and wear resistance of the alloy are improved.