The invention relates to a preparation method of niobium-zirconium alloy wire for electric light source, including the following steps: 1. The niobium-zirconium alloy ingot is cast by die breaking and drawing and forging to obtain forging blank; 2. 2. Anneal the forging blank in the first stage; 3. Pass rolling to get rolling stock; 4. Annealing the rolling billet in the second stage; 5. Roll die drawing to get the drawing blank; 6. Anneal the drawn billet in the third stage; 7. Forming and drawing to obtain semi-finished silk materials; 8. The fourth stage annealing treatment is carried out to obtain the niobium zirconium wire for electric light source. The invention has the advantages of simple preparation technology, easy realization, high yield and high production efficiency; The niobium zirconium wire prepared by the invention has excellent surface quality, excellent mechanical properties and uniform grain, and can be widely used in the electric light source industry.
High pressure sodium lamp made of niobium-zirconium alloy is the third generation of new electric light source, which has the advantages of high luminous efficiency, less power consumption, long life, strong fog penetration ability and no insect trapping, etc. It has a very wide range of applications in domestic and foreign electric light source field, including highway, airport, wharf, dock, station, square, industrial and mining enterprises, parks and other places lighting. Because of the similar thermal expansion coefficient with the ceramic component of high pressure sodium lamp, the high pressure sodium lamp made of niobium alloy plays an irreplaceable role in the electric light source industry. With the continuous development and improvement of manufacturing technology, niobium-zirconium alloy wire has the potential to replace niobium-zirconium alloy pipe by virtue of its low price and high subsequent processing efficiency.
In the subsequent deep processing process of niobium zirconium wire, that is, in the process of high-pressure sodium lamp production, part of the wire needs to be spun into tubular shape. In order to meet the requirements of deep processing, higher requirements are put forward for the mechanical properties, grain structure and surface quality of Niobium zirconium wire.
The traditional manufacturing methods of niobium and niobium alloy wire are mainly extrusion blank, rotary forging or fixed die drawing, and vacuum annealing process. The disadvantages of the traditional manufacturing methods of niobium zirconium wire are as follows: Because of the extrusion blank process, the extrusion tail is long, which leads to the low yield of the product; Niobium zirconium alloy has the characteristics of soft material, high processing heat, poor metal flow, etc. If the extrusion production process adopts rotary forging process, due to the restriction of deformation mode, multiple rounds of rotary forging will lead to the billet surface folding and the formation of surface fine crystal layer after vacuum annealing, which will affect the properties of the wire. If the extrusion process adopts the multi-pass fixed die drawing process, the surface oxidation pretreatment must be carried out before the drawing, the traditional manufacturing method greatly reduces the production efficiency.
