Zirconium alloys are solid solutions of zirconium or other metals, a common subgroup having the trade mark Zircaloy. Zirconium has very low absorption cross-section of thermal neutrons, high hardness, ductility and corrosion resistance.
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Advantages of Zirconium Alloys
High melting point: Zirconium alloy has a high melting point, which can be used for processing and application in high temperature environment.
Corrosion resistance: Zirconium alloys have excellent corrosion resistance and can be used for a long time in harsh environments such as strong acid, strong alkali, high temperature and high pressure, so they are widely used in the fields of chemical industry, marine and nuclear industry.
Good biocompatibility: Zirconium alloy will not cause rejection when it comes into contact with biological tissues, and can be used in the manufacture of medical devices and artificial joints and other medical materials, with good biocompatibility.
Good mechanical properties: Zirconium alloy has excellent mechanical properties, including high strength, high hardness, high toughness and high wear resistance, etc., which can be used to manufacture high-quality mechanical parts and tools.
Low thermal neutron absorption cross-section: Zirconium alloy has a very low thermal neutron absorption cross-section, which can be used as core structural materials for nuclear reactors, such as fuel cladding, pressure tubes, stents and orifice tubes.
What Is Zirconium Alloy Used For? Nuclear and More
Zirconium's atomic number is 40, with the element symbol Zr. Zirconium element has an appearance of silvery metal, and the density is 6.52 g/cm3. Zr has a very small neutron adsorption cross-section and a relatively high melting point (1855 °C or 3371 °F), making zirconium a great material for nuclear power rods. In the 1990s, about 90% of zirconium produced every year was consumed by the nuclear industry. However, as more and more people get familiar with Zr and its compound, more applications have been found.
Zirconium dioxide, or zirconia, is a very important zirconium compound. ZrO2 can be raw materials for technical ceramics, which has great hardness and wear resistance. Zirconia can be also in the form of transparent crystal and it is extremely hard, like diamonds. Thus, zirconium elements can be also found in Jewries, such as zirconium rings and zirconium crowns, etc.
Zirconium metal and Zirconium alloys have advantages in specialized chemical environments - primarily acetic and hydrochloric acids. The corrosion resistance of Zirconium comes from a tightly adhered oxide that forms almost instantaneously. As a result, zirconium has been used to make electrode components, flange bolts, tubes, and rods for special applications. Zirconium products also have wide applications in medical equipment, such as zirconium implants.
Zirconium-based materials have also been found to have some special properties. Zirconium has been used to make high-temperature superconductive materials and Zr crystal bars are often used as the raw material. Zirconium alloys are also considered to be promising materials for commercial amorphous metal, also called metallic glass. Compared with common metal materials, amorphous metal has no grain boundaries, leading to better wear resistance and hardness. What is more, amorphous metals have no grain boundary corrosion and could be heat-formed. To make the amorphous state, the melted alloys need to be cooled down fast. Usually, the speed needs to be millions of K/s, the recently developed Zr-based alloys could make it to be about 1K/s.
Zirconium demand is forecast to increase in the coming years due to the demand for nuclear power plants worldwide. However, only a few large companies possess the technology needed to make nuclear-level zirconium materials, and the huge investment hinders the entry of new players. Although the nuclear industry still consumes a large part of zirconium produced every year, applications in other fields, such as ceramics, have been developed quickly in recent decades.
Pure zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and titanium to a lesser extent. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong corrosion resistance. Zirconium and its alloys are widely used as a cladding for nuclear reactor fuels. Zirconium alloyed with niobium or tin has excellent corrosion properties.
The high corrosion resistance of zirconium alloys results from the natural formation of a dense stable oxide on the surface of the metal. This film is self-healing. It grows slowly at temperatures up to approximately 550 °C (1020 °F) and remains tightly adherent. The desired property of these alloys is also a low neutron-capture cross-section. The disadvantages of zirconium are low strength properties and low heat resistance, which can be eliminated, for example, by alloying with niobium.
Zirconium – Niobium Alloys. Zirconium alloys with niobium are used as claddings of fuel elements of VVER and RBMK reactors. These alloys are the basic material of the assembly channel of the RBMK reactor. The Zr + 1% Nb alloy of type N-1 E-110 is used for fuel element claddings, and the Zr + 2.5% Nb alloy of type E-125 is applied for tubes of assembly channels.
Zirconium – Tin Alloys. Zirconium alloys, in which tin is the basic alloying element, provide improvement of their mechanical properties and have a wide distribution in the USA. A common subgroup has the trademark Zircaloy. In the case of zirconium-tin alloys, the corrosion resistance in water and steam is decreased, resulting in the need for additional alloying.
The cladding material for the new 17×17 fuel designs is also based on the zirconium-niobium alloys (e.g., Optimized ZIRLO material), which have been demonstrated to have improved corrosion resistance compared with prior fuel cladding materials. The optimized tin level provides a reduced corrosion rate while maintaining the benefits of mechanical strength and resistance to accelerated corrosion from abnormal chemistry conditions.
Costs of Zirconium
In terms of cost, these alloys are often the materials of choice for heat exchangers and piping systems for the chemical-processing and nuclear industries. Zirconium is a by-product of the mining and processing of titanium minerals and tin mining. From 2003 to 2007, while prices for the mineral zircon steadily increased from $360 to $840 per tonne, the price for unwrought zirconium metal decreased from $39,900 to $22,700 per ton. Zirconium metal is much more expensive than zircon because the reduction processes are costly. All costs significantly vary with certain purity.
Production of Zirconium
The production of zirconium metal requires special techniques due to the particular chemical properties of zirconium. Most Zr metal is produced from zircon (ZrSiO4) by reducing the zirconium chloride with magnesium metal in the Kroll process. The key feature of the Kroll process is the reduction of zirconium chloride to metallic zirconium by magnesium. Commercial non-nuclear grade zirconium typically contains 1–5% of hafnium, whose neutron absorption cross-section is 600x that of zirconium. Hafnium must be almost entirely removed (reduced to < 0.02% of the alloy) for reactor applications.
Zirconium Alloys in Nuclear Industry
The fuel cladding typically has an inner radius of rZr,2 = 0.408 cm and outer radius rZr,1 = 0.465 cm.
Fuel cladding is the outer layer of the fuel rods, standing between the reactor coolant and the nuclear fuel (i.e., fuel pellets). It is made of corrosion-resistant material with a low absorption cross section for thermal neutrons (~ 0.18 × 10–24 cm2), usually zirconium alloy. The fuel cladding typically has an inner radius of rZr,2 = 0.408 cm and outer radius rZr,1 = 0.465 cm. Compared to the fuel pellet, there is almost no heat generation in the fuel cladding (cladding is slightly heated by radiation). All heat generated in the fuel must be transferred via conduction through the cladding; therefore, the inner surface is hotter than the outer surface.
A typical composition of nuclear-grade zirconium alloys is more than 95 percent zirconium and less than 2% of tin, niobium, iron, chromium, nickel, and other metals, which are added to improve mechanical properties and corrosion resistance. To date, the most commonly used alloy in PWRs has been Zircaloy 4. However, currently, this is being replaced by new zirconium–niobium-based alloys, exhibiting better corrosion resistance. The maximum temperature at which zirconium alloys can be used in water-cooled reactors depends on their corrosion resistance. The most common zirconium alloys, Zircaloy-2 and Zircaloy-4, contain the strong α stabilizers tin and oxygen, plus the β stabilizers iron, chromium, and nickel.
Alloys of type Zircalloy, in which tin is the basic alloying element that improves their mechanical properties, have a wide distribution worldwide. However, in this case, the decrease of corrosion resistance in water and steam is taken place, resulting in the need for additional alloying. The improvement brought about by the additive niobium probably involves a different mechanism. The high corrosion resistance of niobium alloyed metals in water and steam at temperatures of 400–550°C is caused by their ability to passivation with the formation of protective films.
Oxidation of Zirconium Alloys
The oxidation of zirconium alloys is one of the most studied processes in the nuclear industry. The oxidative reaction of zirconium with water releases hydrogen gas, which partly diffuses into the alloy and forms zirconium hydrides. The hydrides are less dense and are weaker mechanically than the alloy; their formation results in blistering and cracking of the cladding – a phenomenon known as hydrogen embrittlement. While many of these reports are written to address the reaction of fuel and steam with zirconium alloys in the case of a nuclear accident, there are still a substantial number of reports dealing with the oxidation of zirconium alloys at moderate temperatures of about 800 K and below.
Future Potential and Development of Zirconium Alloy
As industries Zirconium and Zirconium Alloy Products to push boundaries, zirconium alloy emerges as a key player in shaping the future of industrial applications. With its exceptional corrosion resistance and high-temperature stability, zirconium alloys are paving the way for groundbreaking innovations across various sectors.
The ongoing research and development efforts in zirconium alloy technology are fueling advancements in aerospace, nuclear power, and chemical processing industries. Engineers are exploring new ways to enhance the strength and durability of zirconium alloys, opening doors to even more diverse applications.
In addition to its mechanical properties, zirconium alloy's biocompatibility makes it an attractive option for medical implants and devices. The potential for further growth in this area is promising as researchers delve deeper into optimizing zirconium alloys for biomedical purposes.
With continuous improvements and discoveries on the horizon, the future of zirconium alloy looks bright as it continues to revolutionize industrial processes and drive innovation forward.
The use of zirconium alloy products in industrial applications offers a multitude of benefits that make it a highly desirable material for various industries. With its exceptional corrosion resistance, high-temperature strength, and biocompatibility, zirconium alloys are poised to play an increasingly significant role in shaping the future of industrial manufacturing and technology.
As advancements continue to be made in the development and application of zirconium alloy products, we can expect to see even greater innovation and progress in industries ranging from aerospace and healthcare to nuclear power generation. The versatility and reliability of zirconium alloys make them a valuable asset in pushing the boundaries of what is possible within industrial processes.
By harnessing the unique properties of zirconium alloys, manufacturers can enhance performance, improve efficiency, reduce maintenance costs, and ultimately drive success in their respective fields. As we look towards the future, it is clear that zirconium alloy products will continue to be at the forefront of cutting-edge industrial applications worldwide.
Zirconium Alloys to Meet Demands of Materials in Fusion
Materials and Fusion Reactor Design
Nuclear fusion has been extensively investigated in recent years due to its ability to create clean energy without the proliferation of radioactive byproducts. In fusion, two elements are fused together to release energy. Currently, the best candidate for fusion is a deuterium-tritium reaction. Deuterium and tritium are two isotopes of hydrogen, which when fused create helium, free neutrons, and energy. Currently, designs being evaluated for fusion reactors are DEMO, STEP, and ITER.
In a fusion reactor, the neutron efficiency challenges are different from fission reactions. Tritium must be constantly replenished to sustain the long-term efficiency of the fusion reaction. This is accomplished by breeding the tritium via inelastic neutron scattering. As the reactions occur at elevated temperatures and are subject to thermal creep, materials that can perform well at elevated temperatures whilst maintaining a low thermal neutron cross-section are required.
The selection of materials with superior structural and thermal properties is essential for the safe and optimal design of fusion reactor components. A key element of fusion reactor design is the breeder blanket, which shields the reactor instruments from radiation. Breeder blankets are composed of a set of modules that cover the interior of the fusion reactor vessel and must withstand extreme temperatures and intense neutron fluxes. Additionally, it ensures maximum reactor efficiency.
Materials that have been explored as candidates for breeder blanket design include vanadium, iron, silicon, and chromium-based alloys and composites. Recent studies have demonstrated that zirconium (Zr) is an advantageous candidate if used as a structural material in the first wall of a breeder blanket in a DEMO-like reactor.
Advantages of Zirconium
Zirconium has already been used as a material in fission reactor applications for approximately six decades. Today, many zirconium alloys are used as fuel claddings and assemblies in light water fission reactors. Common alloys include Zr-2.5, ZIRLOTM, and Zircaloy-2 and –4. The success of these alloys has largely been due to the small cross-section of their thermal neutron absorption, relative to other structural material elements.
The advantage of a small thermal neutron absorption cross-section is that it allows the higher availability of neutrons, which sustains the fission reaction's criticality. Other materials need further enrichment, which can be financially costly. However, as fusion reactions occur at elevated temperatures and there is an inherent thermal creep that occurs during operation, current zirconium alloys are insufficient.
Investigating Current Zirconium Alloys and Addressing Issues
In the study published in the Journal of Nuclear Materials, the authors have investigated several currently commercially available zirconium alloys including binary alloys such as Zr-V and Zr-Si alloys, as well as higher-order alloys such as Zr-Nb-Ti and Zr-Mo-Sn. It was concluded that with further research, higher-order alloys could show advantageous thermal and structural properties (such as strength and ductility) whilst maintaining a low thermal neutron cross-section.
However, currently, there is incomplete data on the performance of these alloys under elevated temperatures that occur during operation. In a fusion reactor, temperatures could easily reach as high as 500-700 oC. Any structural material composed of zirconium alloys would be expected to display superior thermal and mechanical properties when used in liquid metal or helium-cooled breeder blankets.
Investigating the currently available zirconium alloys, the authors concluded that using Zr-4 as a breeder blanket structural material would markedly improve the tritium breeding ratio. Whilst this is significantly better than other candidates such as V-4Cr-4Ti, there are still issues with strength, thermal creep resistance, and fatigue properties under elevated temperatures. Moreover, impurities can cause embrittlement issues, facilitating the need for barrier coatings.
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Located in Baoji, Shaanxi province, known as China's Titanium Valley, Baoji West Titanium Materials Co., Ltd (West-Ti) was established in 2019 with a registered capital of 60 million yuan. The company was merged with Baoji Hongyuan Titanium Industry Co., Ltd. and Baoji Overflow Industrial Co., Ltd, both companies have more than 20 years of experience in the titanium industry. In 2019, the jointly established Baoji West Titanium Materials Co., Ltd business covers the processing and sales of rare metals such as titanium coil, plate, bar, wire, and titanium forging.
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