Rapid part prototyping method for refractory materials

Abstract

Provided is a rapid part prototyping method for refractory materials. The technical defects that a powder metallurgy (PM) forming mode is complex and wastes time, and the liquid phase amount cannot reach the technical index of compactness and the comprehensive performance of alloy cannot be given to full play by means of a selective laser melting (SLM) method can be overcome. The rapid part prototyping method includes the steps that 1, a CAD model for a part is designed through three-dimensional modeling software, then multi-layer slicing information is generated through slicing processing software and stored as an STL file, and data of the STL file are transmitted to an SLM rapid prototyping system; 2, a layer of metal powder (with the particle size being about 50 micrometers) to be machined is laid on a working platform through a powder feeding mechanism, and the thickness of the layer of metal powder is 0.52 mm; and 3, a fiber laser is adopted for scanning and slicing, the metal powder to be machined which is laid in the step 2 is molten, and the scanning speed is 800 mm / s. The rapid part prototyping method has the beneficial effects that the powder is alloyed, the binding force of alloy is increased, liquid filling and prototyping compaction are better facilitated, and therefore the comprehensive performance of the alloy is improved. According to the method, time is saved, and material efficiency is higher.

Description

1. Technical field [0001] The invention belongs to the field of rapid prototyping technology and powder sintering composite forming, in particular to a rapid part forming method of refractory materials. 2. Background technology [0002] Refractory materials generally refer to metals with a melting point higher than 1650°C and certain reserves (tungsten, tantalum, molybdenum, niobium, hafnium, chromium, vanadium, zirconium and titanium), and metals with a melting point higher than the melting point of zirconium (1852°C). For refractory metals. Based on these metals, alloys formed by adding other elements are called refractory metal alloys. The main refractory metals used in the manufacture of structural materials resistant to high temperatures above 1093°C (2000°F) are tungsten, molybdenum, tantalum and niobium. Among refractory metal alloys, molybdenum alloy is the earliest alloy used as structural material. Mo-0.5Ti-0.1Zr-0.02C alloy has good high temperature strength and...

AI Technical Summary

Problems solved by technology

However, PIM still does not deviate from the liquid phase sintering densification principle of traditional PM, and there are the following shortcomings (1) before degreasing and sintering, the density of the blank is low; (2) the blank is prone to bubbling, bending, and cracking during the degreasing process , collapse and other defects, currently only suitable for the preparation of small parts (; 3) the whole process requires mold support, so it is impossible to manufacture parts with extremely complex structures, such as curved surface impellers, three-dimensional mesh structure parts, etc., and the required molds are expensive