Preparing method for molybdenum and molybdenum alloy pipe

Abstract

The invention belongs to the technical field of powder metallurgy machining, and particularly relates to a preparing method for a molybdenum and molybdenum alloy pipe. The technology steps of molybdenum and molybdenum alloy pipe blank preparing, molybdenum pipe hot rolling, molybdenum pipe warm rolling and surface treatment and control over the technology conditions are adopted, and the super-long and thin-wall seamless molybdenum and molybdenum alloy pipe is prepared. Due to the comprehensive effects of hot rolling and warm rolling, the molybdenum and molybdenum alloy pipe prepared through the method achieves the beneficial effects that the molybdenum pipe is super long, thin in wall and seamless, the yield is high, and the comprehensive utilization rate of materials is high. The large deformation rate is achieved when molybdenum and a molybdenum alloy are used for preparing the pipe, an inner structure of the molybdenum pipe is refined and homogenized, and the mechanical performance is excellent; and an existing molybdenum pipe preparing technology is simplified, the materials are saved, and implementation is easy.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy processing, and in particular relates to a method for preparing molybdenum and molybdenum alloy pipes. Background technique [0002] The refractory metal molybdenum and molybdenum alloys are high-melting-point materials, and their melting point reaches 2620°C. They have high mechanical strength, hardness, corrosion resistance, good thermal conductivity and high-temperature wear resistance at high temperatures, so they are made into molybdenum tubular special-shaped Components, such as thermocouple protection tubes, nozzles, crucibles, tubular electrodes, etc., are widely used in aerospace, metallurgical smelting, sapphire growth, quartz glass smelting and other fields. [0003] Existing studies have shown that the methods for preparing molybdenum tubes of different specifications include powder metallurgy sintering, extrusion or swaging, spinning, rolling deformation after extrusion and ...

AI Technical Summary

Problems solved by technology

Chinese Patent Application No.: 201510290578.X, Invention Name A hot isostatic pressing preparation method for tubular molybdenum alloy sputtering targets, including the steps of designing and making envelopes, powder filling, vacuum heat treatment, and hot isostatic pressing. The advantages of high target density and low content of impurities, but its high cost and high requirements for powder physical and chemical indicators are limited

Chinese patent application number: 200680000272.5, the name of the invention is tubular target, including the steps of tube blank production, hot extrusion, back plate connection, mechanical processing, etc. This patent has the advantage of obtaining high-density tubular molybdenum target, but metal molybdenum and molybdenum Alloys are hard-to-deform metals, which must be heated when forging or extruding, and have higher requirements for tooling

Chinese patent application number: 201020678975.7, the name of the invention is a muffle furnace lining furnace tube, the molybdenum plate is crimped and then welded to obtain a molybdenum tube with a relatively large length and diameter. It is composed of molybdenum tubes with a section wall thickness of 2mm. Its obvious disadvantages are that the grains at the weld seam are coarse, and there are leakage points or stress concentration points, which are easy to become the source of defects.

But generally speaking, there are technological shortcomings such as long and cumbersome processes, high energy consumption, high cost, low yield and material utilization, and lack of stable product quality.