Molybdenum market quotation: the latest price of molybdenum concentrate, ferro molybdenum and ammonium molybdate is unchanged from the previous trading day. The 19th National Congress is held today, coming with the news of production limitation and stopping. It is reported that large mines in Heilongjiang province announced to stop production to undergo repair for twenty days. With the support of the news, prices of raw materials stabilize. But trading in downstream enterprises is in a stalemate, purchasers lack enthusiasm for entering the market. Besides, there have no good news from the steel biddings, thus short-term domestic molybdenum price will be under pressure.
Price of molybdenum products on Oct. 18, 2017
Picture of molybdenum powder
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1. Molybdenum wire operation
During discharge operation, molybdenum wire worked with the workpiece will damage itself, but because of molybdenum has good mechanical properties, so the loss will not obvious. In order to extent the life of molybdenum wire, when the machine is replaced on new molybdenum wire, there should use small energy processing parameters for cutting, which can reduce the damage of molybdenum wire. After machine running a period of time, molybdenum wire color is basically white and then use the normal high current for cutting. In addition, after the replacement of molybdenum wire and before cutting, molybdenum wire should operate without workpiece cutting for 5-10 minutes, so that the internal stress of molybdenum wire can be released.
Molybdenum wire usually fails in the process of cutting operation and the majority of broken end is in the wire cylinder after the exchange of ten to dozens of laps. From this we can see both ends of the molybdenum wires are easier to be broken. Therefore, during operation, at regular intervals, the molybdenum wire tube should be adjusted.
Daily molybdenum wire maintenance can also improve its service life, such as daily molybdenum wire storage, placement and storage time and so on. Molybdenum wire should be reported on the low humidity, ventilated and shady places and the temperature is at 20 ℃ ~ 25 ℃, to avoid oxidation. Another molybdenum wire placed in the time should not exceed 6 months, because longer time storage is more likely to show the problem of perpendicular. Before using should to check whether the packaging is damaged or deformed.
3. Molybdenum wire installation
Molybdenum wire is easily deformed and broken, so it should not be bended in the process of installation. If there are bends, the bends should be cut off to avoid broken wires in the course of operation. In the course of the use the cutting fluid should be replaced, because cutting fluid after a long time use will turn to black, which will directly affect the performance of molybdenum wire, leading to molybdenum wire fracture.
The composite rod-shaped molybdenum electrode is a molybdenum rod at the hot end and molybdenum disilicide or stainless steel at the cold end. Cold end of the molybdenum disilicide or stainless steel used in the transition zone, while the hot end of the molybdenum rods are safe through the transition zone. As the
molybdenum disilicide is very brittle, and easy to contaminate the glass and foaming, so in the design process, molybdenum disilicide length should to well be designed so that it will not to touch the glass. In addition, during installation, should be careful to prevent breakage. Composite rod-shaped molybdenum electrode cold end can also use stainless steel, but the stainless steel material must be a special heat-resistant steel and nickel-based alloy has widely used at home and abroad.
As is well known, molten lead glass uses tin dioxide ceramic as the electrode material. However, in recent years, people have tried to connect tin dioxide ceramic materials with molybdenum electrode used for lead glass production, which is a new electrode material. When the lead glass is melted by this kind of composite electrode, cooling water must be supplied to the inside of the electrode so that the hot end can be sufficiently cooled and the molten glass is not contaminated.
Composite electrode can reduce the cost of the electrode assembly. Commonly used composite rod-shaped electrode is made up of molybdenum electrode cap, molybdenum tube, molybdenum tube base, stainless steel water-cooled bracket, electrode bricks and other components. In order to prevent electrode oxidation at the high-temperature, it has been proposed to provide a water cooling tube inside the electrode. The electrode with water cooling tube inside has been put into use in the 70s of last century. To add water in the electrode cooling tube, the composite electrode diameter should be bigger and the current density can be smaller, thereby reducing the erosion of the electrode.
According to the experiment found that the electrode with a cold water pipe in furnace didn’t need to be replaced. Installed in the cold water pipe in electrode, the circulating cooling water will not go through the low temperature side of the stainless steel parts, rather than through the hot side of the molybdenum electrode part.
Molybdenum wire is a kind of molybdenum products, it has the excellent properties, such as high melting point (2620 ℃), high density (10.2g/cm3), high strength rare refractory metals, thermal expansion coefficient, good thermal conductivity, high strength, high temperature, wear resistance, corrosion resistance and other excellent physical and chemical properties. Molybdenum wire applications are widely, which is usually used in the fields of aviation and aerospace, metallurgy, machinery and electronics, automobile manufacturing and so on. According to its application, it can be divided into spraying molybdenum wire, molybdenum cutting wire, molybdenum heating wire and so on. Molybdenum wire is mainly used in the picture tube industry, spraying industry and wire cutting industry.
In the picture tube industry, molybdenum wire is mainly used in electron gun and the annual demand is about 15 million meters. There are high requirements on molybdenum wire in this industry, including molybdenum content (greater than 99.5%), specifications (0.127mm, 37.3mg / 200mm) and impurities and so on.
Molybdenum wire has good high temperature, wear resistance and high strength properties, so it is often used in the molybdenum coating industry for spraying automotive wear-resistant devices such as gearbox and push fork fork, engine piston ring, synchronous ring, brake pads, heat moment adders, cylinder body surfaces and others. Molybdenum wire used in the spraying industry has the following requirements, the minimum purity more than 99.5%, strict controlled on C, Na, O2 and other impurity elements. At the same time, molybdenum wire surface should to be smooth, no cracks, burrs, oil and other defects.
The application amount of molybdenum cutting wire in cutting field in 2000 reached 260 million meters, and in the future the application amount will continue to grow. Molybdenum cutting wire used in cutting industry has some requirements, such as molybdenum content not less than 99.3%, having good tensile strength, low elongation, large crimp rate, uniform diameter, and the surface without oxide layer.
Molybdenum wire is an important product among molybdenum finished products and its total production accounted for 13% of molybdenum deep processing product’s total output. China molybdenum wire is divided into pure molybdenum wire and doped molybdenum wire and the diameter is generally between 0.051 to 0.350mm. The brands of China molybdenum wires are Mo1, Moδ, Mo2, Mo3, Mo3 δ. There Mo1 and Mo2 are pure molybdenum and Mo3 is doped molybdenum wire which is doped with Ca, Mg and other elements. Molybdenum wire main production processes are mainly as follows: First, through the powder metallurgy method can obtain molybdenum powder and the metal powder after sintering will produce molybdenum bar.
Secondary, the molybdenum bar is processed rotary forging or rolling to obtain molybdenum rod. Finally, after tensile process the manufacturers can manufacture molybdenum wire with required diameter. Compared with foreign molybdenum wire, there are some shortages on China molybdenum wire. The main problem is simple product structure. Besides, molybdenum billet is lighter and the average length of molybdenum wire is shorter. Further, uneven thickness of molybdenum wire is obvious and the surface has some shortcomings, such as trench, burr and easy to break and other.
China's molybdenum wire trade developed rapidly in recent years, from 1996 to 2000, molybdenum wire exports accounted for 22.3% of imports and exports total trade volume. The exported molybdenum wire is mainly used in the picture tube industry, molybdenum coating industry and wire cutting industry.
At present, China's molybdenum wire production technology and equipment have been very perfect, and with the development of production technology, China molybdenum wire can not only meet the domestic market, but also can demand foreign market, so there are more than 10 tons molybdenum wire for export.
However, China's molybdenum wire in quality, innovation and other aspects still has some problems. In order to accelerate the development of molybdenum wire, China should first accelerate the development of molybdenum leading company to concentrate other scattered enterprises, in order to scale, multi-species, high-quality produce molybdenum wire. In addition, the molybdenum companies should through purchase the advanced production equipment and improve production methods to improve the quality of molybdenum wire products. Finally, they should combine with market demand to develop new varieties.