46results about How to "Increased Diffusion Enhancement Effect" patented technology

The invention belongs to the technical field of nonferrous metal processing, and in particular relates to a method for producing high-strength copper alloy large-scale ingots by vacuum melting. The present invention is characterized in that it contains the following components and mass percentages: 14-16% nickel, 7-9% tin, 0-0.2% niobium, 0-0.8% manganese, and the balance is copper and other impurities. The invention comprises the following steps: batching, casting mold drying, furnace loading, vacuuming, smelting, furnace removal, heat preservation and cooling. The advantages are: niobium and manganese are added to the copper-nickel-tin alloy, which increases the dispersion strengthening effect of the alloy and is conducive to improving the strength of the alloy; the alloy produced by the vacuum induction melting process is higher in purity than the continuous casting process, and the inclusions Reduction; the mold and the ingot adopt the process of keeping the upper half warm and the second half cooling, which avoids or reduces shrinkage porosity and shrinkage cavity defects, and ensures faster cooling of the ingot, thereby reducing segregation defects.

The invention relates to a thermal treatment process for a TC18 titanium alloy and belongs to the technical field of materials. A method comprises the following steps: preserving heat of the TC18 titanium alloy at the temperature between Tbeta-60 DEG C and Tbeta-100 DEG C (Tbeta is the beta-phase transition temperature of the alloy) for 2-8 hours, and cooling to the room temperature through air cooling or water cooling; aging the alloy at the temperature of 540-600 DEG C for 4-12 hours, and cooling to the room temperature through air cooling. By selecting the heat-preserving temperature, time and cooling way, the microscopic structure of the alloy can be regulated and controlled effectively, a microscopic structure in which an equiaxial phase alpha (the content is higher than 10 percent by volume, and the size is greater than 2 microns), a flaky phase alpha (the thickness is greater than 0.5 micron) as well as a large number of fine needle phase-alpha and phase-beta substrates are matched is realized, the TC18 titanium alloy is high in strength, plasticity and toughness, and the problems of poor alloy strength in a dual annealing process and difficulty in meeting the use requirements on the plasticity and toughness of the alloy in a solid solution-aging process are solved. The method is suitable for industrial application.

A method for improving the hardness of copper-based multi-element alloys. The main method is to place the metal-cast copper-based multi-element alloys on a six-sided top press for high-pressure aging treatment. The pressure is 2-5Gpa, the heating temperature is 480-550°C, and the heat preservation After 60-120 minutes, turn off the power and release the pressure to cool down to room temperature. The process of the present invention is simple, easy to control, and stable in performance. The copper-based multi-element alloy treated by the method can obtain a higher hardness value, and the structure is more uniform and dense. Compared with the copper-based multi-element alloy before treatment, the hardness value is improved. About 28.05%; compared with conventional heat treatment, its hardness value increased by about 10.54%.

The invention discloses a preparation method of a high-strength wear-resistant copper alloy pipe, which comprises the following components and mass percentages: nickel 14-16%, tin 7-9%, niobium 0-0.2%, manganese 0-0.8%, and the balance is copper and unavoidable impurities, the present invention also discloses its preparation method: through steps such as batching, smelting, casting, grinding, forging, solution treatment, machining, cold rolling, sizing detection, strip treatment, etc., high-quality copper-nickel Tin alloy tubing. The advantages are: the high-frequency induction heating can quickly heat the ingot to the temperature required by the process, and prevent the segregation defects caused by the slow heating speed; control the heating speed, final forging temperature and cooling speed, so as to prevent the segregation in the tube billet Defects occur; a complete copper-nickel-tin pipe processing method is provided, and the method is suitable for the production of small batches of copper-nickel-tin pipes with multiple specifications.

The invention provides WC particle reinforced composite brazing filler metal used for brazing hard alloy and a preparation method thereof, and relates to a brazing material and a preparation method thereof. The invention aims to solve the technical problems that a hard alloy brazed joint is easy to wear, relatively low in working strength and poor in wettability. The brazing filler metal provided by the invention is prepared from Al, Ti, Ni, W, Co, Cr, B, Fe, Si powder and WC particles. The preparation method comprises the following steps of weighing of raw materials, mechanical alloying of composite brazing filler metal, smelting and preparing of composite brazing filler metal foils. After going through a ball-milling process, a high-temperature smelting process and an ultrasonic vibrating process, the WC particles generate obvious refining behaviors, so that the dispersivity of WC particle reinforced phases in a brazing filler metal substrate is better, the uniformity of the whole brazing filler metal is improved, and therefore the performance stability of the brazing filler metal is ensured. The invention belongs to the field of brazing filler metal preparation.

The invention relates to methods for preparing and spraying aluminum bronze powder containing a dispersion-strengthening phase. The method for preparing the aluminum bronze powder comprises the following steps: using aluminum oxide dispersion-strengthened copper powder and nanometer aluminum powder which are prepared by using an inner oxidizing method, as the raw materials; using a gluing agglomerating method to cover a layer of nanometer aluminum powder on the surface of the copper powder; and drying at a vacuum environment. The plasma spraying process is used in the method for spraying the aluminum bronze powder, wherein a spraying powder is controlled within 15-18KW and the powder feeding speed is 20-35g / min. According to the method provided by the invention, the aluminum bronze compound powder is prepared by covering the dispersion-strengthened copper powder with the nanometer aluminum powder. By using the dispersion-strengthened copper powder and the nanometer aluminum powder as the raw materials for agglomerating, the defect that the aluminum oxide dispersion-strengthened copper powder cannot be directly prepared is solved. By covering the copper powder with aluminum, the melting degree of the powder is increased by utilizing the heatproof reaction between copper and aluminum, thereby reducing the spraying power, reducing the growth of the aluminum oxide dispersion-strengthened grains and enhancing the dispersion-strengthening effect.