3results about How to "Lower recrystallization temperature" patented technology

The present application relates to copper-aluminum composite plate strip technical field, especially a kind of copper-aluminum composite plate strip and production method, it is made of aluminum material and copper material composite, the oxygen content of copper material is 50ppm-500ppm, production method includes oxygen-increasing treatment to red copper or oxygen-free copper, the present application reduces the recrystallization temperature of copper material by increasing the oxygen content in copper material, in turn reduces annealing temperature, copper-aluminum composite blank heat treatment below 300 DEG C can satisfy copper material complete recrystallization, realize soft annealing, meet the demand of bending, while reducing the thickness of copper-aluminum intermetallic compound in heat treatment process, improve the composite strength of copper-aluminum composite plate strip.

The invention discloses rolled copper foil for a flexible printed circuit board and a preparation method of the rolled copper foil. The rolled copper foil is prepared from the following components in percentage by mass: 0.002 to 0.005 percent of Ag, 0.01 to 0.1 percent of La, 0.01 to 0.05 percent of Ce, 0.05 to 0.25 percent of Nd, 0.01 to 0.1 percent of O and the balance of Cu and inevitable impurities. The rolled copper foil for the flexible printed circuit board solves the problems of low flexibility and high recrystallization temperature of the rolled copper foil for the flexible printed circuit board, and the comprehensive performance of the rolled copper foil is improved by optimizing new alloy components and a rolling process, so that the rolled copper foil is suitable for flexible and conductive circuit boards with high requirements.

The invention belongs to the technical field of steel heat treatment processing, and particularly relates to an electric pulse heat treatment method for medium carbon steel. The method comprises the following steps that S1, a steel billet is rolled, the deformation amount of the steel billet is controlled to be 70%-85% in the rolling process, and deformed steel is obtained; and S2, the deformed steel is subjected to electric pulse treatment for 10-60 min under the condition that the peak pulse current density is 45-55 A / mm < 2 >, and then the high-strength and high-plasticity steel is obtained through cooling. A large number of dislocations, vacancies and other defects can be introduced into metal through cold deformation, a large number of cementite nanoparticles are rapidly and evenly separated out in the material in cooperation with high-density pulse current, and the strength of the 45 steel is improved. In addition, the recrystallization temperature of the material can be reduced through the high-density pulse current, the material is promoted to be recovered and recrystallized within a short time, fine recrystallized grains are generated, and the strength and plasticity of the 45 steel are both improved.