Properties, processing technology and application prospects of zirconium alloys
As an important metal material, zirconium alloy contains about 0.026% of the earth's crust, which is 2.5 times the content of copper. Its unique physical and chemical properties, such as high melting point, moderate density, excellent strength, low expansion coefficient and small elastic modulus, as well as corrosion resistance in a variety of media, make it occupy an important position in modern industry.
1. Performance characteristics of zirconium alloy
Zirconium alloy is known for its high melting point, corrosion resistance, excellent strength and processing performance. In particular, the two types of zirconium alloys, Zr-Sn and Zr-Nb, have relatively mature production processes, and grades such as Zr-2, Zr-4 and Zr-2.5Nb, are widely used in various industrial fields.
2. Processing technology of zirconium alloy
The processing technology of zirconium alloy mainly includes extrusion forming and forging forming.
Zirconium alloy extrusion forming
Zirconium alloy pipes and bars are important structural materials in nuclear reactors, accounting for about 75% to 80% of the total use. These pipes and bars are mainly made by extrusion forming. In order to optimize the extrusion process and reduce product defects, special lubricants have been developed.
Zirconium alloy forging
Forging is a key step in the production of zirconium alloys, which aims to break the cast structure and improve the metal properties. The forging process involves multiple parameters such as heating specifications, forging temperature and forging equipment. The forging temperature is generally controlled at 950-1100℃, and medium and high temperature resistance furnaces are used for heating.
3. Application fields of zirconium alloys
Nuclear industry
Zirconium alloys are used as key components such as fuel cladding tubes and control rod guide tubes in nuclear reactors. Their low neutron absorption cross-sectional area and excellent corrosion resistance make them an indispensable material in the nuclear industry.
Deep sea and space exploration
Zirconium alloys have great application potential in special environments such as deep sea and space exploration due to their low thermal expansion coefficient and resistance to radiation damage.
Chemical industry
Zirconium alloys have strong corrosion resistance to various acidic environments, so they are widely used in valves, acid-resistant pumps and other equipment in the chemical industry.
Dental industry
Zirconium oxide ceramics have become an important material in the dental field due to their chemical stability and biocompatibility.
Biomedical
α+β dual-phase and β single-phase zirconium alloys have good biocompatibility with human tissues and are potential choices for surgical implant alloys.
4. Key to plastic forming technology of zirconium alloys
Plastic forming methods of zirconium alloys include forging, extrusion and rolling. There are many factors that affect its plastic processing deformation, mainly including strain rate, temperature and lubrication conditions. Optimizing these parameters is crucial to improving the processing efficiency and product quality of zirconium alloys.
With the continuous advancement of technology and the continuous expansion of the market, the application prospects of zirconium alloys will be broader. In the future, zirconium alloys will show their unique advantages and value in more fields.
