Shenzhen Wuge Industrial Co., Ltd

The process flow of nickel titanium memory alloy generally includes the following main steps:

smelt

(1) Raw material preparation: High purity nickel (Ni) and titanium (Ti) are selected as the main raw materials, and precise proportioning is carried out according to the required alloy composition ratio. At the same time, other elements such as niobium, molybdenum, etc. may be added to improve the performance of the alloy.

(2) Melting equipment: Vacuum induction melting furnaces or electron beam melting furnaces are usually used for melting. Melting in a vacuum environment can effectively reduce the mixing of impurities and improve the purity and quality of the alloy.

(3) Melting process: Put the prepared raw materials into the melting furnace, heat them to a certain temperature to melt and mix them thoroughly. During the melting process, it is necessary to precisely control parameters such as temperature, melting time, and stirring speed to ensure that the alloy composition is uniform and consistent.

forge

(1) Heating billet: Heat the nickel titanium alloy ingot obtained by melting to the appropriate forging temperature range. Generally speaking, the forging temperature of nickel titanium alloy is around 800-1000 ℃.

(2) Using appropriate forging equipment: forging the heated billet using forging hammers, presses, and other equipment. Through multiple forging and upsetting operations, the as cast structure can be broken, making it denser and more uniform, while improving the mechanical properties of the alloy.

(3) Control forging ratio: Forging ratio is an indicator of the degree of metal deformation during the forging process, generally controlled between 3-10. The appropriate forging ratio helps to improve the strength and toughness of the alloy.

rolling

(1) Heating and Rolling: Heat the forged alloy billet to the appropriate rolling temperature and then roll it on a rolling mill. Rolling can be divided into two stages: hot rolling and cold rolling. Hot rolling is generally carried out above the recrystallization temperature, which can further refine the grain size and improve the strength and toughness of the alloy. Cold rolling is carried out at room temperature or lower temperatures, mainly for obtaining high-precision dimensions and good surface quality.

(2) Control rolling parameters: including rolling speed, reduction amount, rolling pass, etc. By controlling these parameters reasonably, the thickness, width, and properties of the alloy can be precisely adjusted. For example, gradually reducing the reduction amount and increasing the rolling passes can make the microstructure of the alloy more uniform and the mechanical properties more stable.

heat  treatment

(1) Solution treatment: Heat nickel titanium alloy to high temperature (usually 900-1050 ℃), hold for a certain period of time, and then rapidly cool it (such as water cooling). The purpose of solid solution treatment is to fully dissolve the alloying elements in the alloy into the matrix, forming a uniform solid solution, thereby improving the strength and corrosion resistance of the alloy.

(2) Aging treatment: The alloy after solution treatment is subjected to aging treatment at a lower temperature (usually 400-600 ℃). Aging treatment can cause solute atoms in the alloy to agglomerate and precipitate, forming small and uniform precipitate phases, thereby further improving the strength and hardness of the alloy.

Surface Treatment

(1) Mechanical polishing: using polishing equipment and abrasives to polish and polish the surface of nickel titanium alloy to obtain a smooth surface, reduce surface roughness, improve surface quality and aesthetics.

(2) Chemical treatment: Chemical methods such as acid washing and alkali washing are used to remove oxide scale, oil stains, and impurities from the surface of the alloy. For example, using a mixed acid solution of hydrofluoric acid and nitric acid for acid washing can effectively remove the surface oxide film, making the alloy surface appear metallic luster.

(3) Coating treatment: According to actual application requirements, one or more functional coatings can be applied to the surface of nickel titanium alloy, such as corrosion-resistant coatings, wear-resistant coatings, biocompatible coatings, etc. Coatings can further improve the corrosion resistance, wear resistance, and biocompatibility of alloys.

Processing and molding

(1) Cutting: According to specific product size and shape requirements, cutting equipment (such as laser cutting machines, wire cutting machines, etc.) is used to cut nickel titanium alloy sheets or bars into the required blanks.

(2) Forming: Processing the blank into the final product shape through stamping, bending, stretching and other forming processes. For some complex shaped products, special processes such as mold forming or powder metallurgy forming may also be required.

Quality Inspection

(1) Chemical composition analysis: Accurate detection of the chemical composition of the alloy is carried out using spectroscopic analysis, chemical titration, and other methods to ensure that the alloy composition meets the design requirements.

(2) Mechanical performance testing: including tensile testing, hardness testing, impact testing, etc., to evaluate whether the mechanical performance indicators such as strength, toughness, and hardness of the alloy meet the requirements of product use.

(3) Microstructure observation: Use metallographic microscope, electron microscope and other equipment to observe and analyze the microstructure of the alloy, check whether the grain size, phase composition, and microstructure uniformity meet the standards.

(4) Dimensional accuracy measurement: Use measuring tools (such as calipers, micrometers, coordinate measuring instruments, etc.) to accurately measure the dimensions of the product, ensuring that the dimensional accuracy of the product meets the design requirements.

(5) Surface quality inspection: Inspect the surface quality of the product through visual inspection, roughness measurement, and other methods to check for defects such as cracks, pores, sand holes, scratches, and whether the surface roughness meets the requirements.

Wuge Nickel Titanium Alloy is engaged in the research and development, smelting, rolling, drawing, sales, and service of nickel titanium memory alloy materials. It has its own factory and complete production equipment, providing incubation services for nickel titanium memory alloy materials and finished products.