Research And Development Of Free Cutting High Conductivity Tellurium Copper Alloy- SCALE STEEL.
Tellurium copper is a tellurium bronze material, tellurium and copper alloy, tellurium copper containing 0.4-0.7% tellurium has good machining performance; Copper telluride containing 50% tellurium and 50% copper is used as an intermediate alloy. American ASTM standard C14500, is the United States according to its industrial development requirements in the 1960s successfully developed a high conductivity free cutting copper alloy material, to fill the gap of copper alloy precision processing materials. Tellurium copper[SCALE STEEL] alloy material has both good free cutting performance and excellent electrical and thermal conductivity, as well as corrosion resistance and electric ablation resistance. It has good cold and hot processing performance, and can be forged, cast, extruded and drawn, and molded by punching. Products can be processed into plate, sheet, bar, wire, pipe and other profiles and a variety of profiles.
Properties Classification Of Tellurium Copper Alloys
(1) high conductivity tellurium copper base alloy
High conductivity tellurium copper alloys are usually denoted by DT. Tellurium copper alloy and silver copper have excellent electrical and thermal conductivity, in addition to corrosion resistance, excellent arc performance. Tellurium copper alloy materials of excellent comprehensive performance meet the European Union and our country in recent years, respectively in the about banning the use of certain hazardous substances in electrical and electronic equipment directive and the electronic information product pollution control management measures "such as stipulated in the law banned [SCALE STEEL]in electronic electrical equipment used in the newly introduced contain lead, mercury, hexavalent chromium, polybrominated benzene ether and polybrominated biphenyl and other harmful substances Customs requirements. Tellurium copper, however, has its own advantages: it has good hot and cold working performance, and its chip performance is better than silver copper, and can even replace lead brass. The main excellent properties are introduced: 1) it has high conductivity. Tellurium copper alloy is very high compared with copper, than the same performance of red copper is more than 10%-13%, and more than silver copper 10%-15%, such tellurium copper alloy conductivity 94% to 98%; 2) With high thermal conductivity. 22% more than pure silver, 28% more than red copper; 3) Good electric arc resistance. Under the condition of high conductivity, the strength of tellurium alloy can be improved by adjusting the processing conditions, so as to obtain high strength and high conductivity tellurium alloy. DT tellurium copper alloy material with its excellent performance, is widely used in manufacturing electronics, home appliances, transportation, electrical parts, in the field of high conductivity, high thermal conductivity and other fields has a great role, in the future development can even be used to replace silver copper, in many industries have a great [SCALE STEEL]space for development, has a commercial prospect.
(2) High Strength Magnesium Telluride Copper Base Alloy
The code name of high strength magnesium tellurium copper alloy is generally expressed by MDT. This kind of alloy is a kind of high performance copper alloy with high conductivity, excellent arc resistance and good mechanical properties. It is widely used in the relevant parts of high-speed railway network. This kind of product has the following characteristics: 1) good physical performance, good collocation between each other; [SCALE STEEL] 2) Excellent electric arc resistance. This kind of alloy is mainly concentrated in German enterprises, and is widely used in connectors, commutators and other electrical industries. And our country is mainly in the development test stage, China railway Institute and so on have applied for relevant patents. In other countries, a small number of such alloys are produced, mainly in developed countries.
(3) Free Cutting Phosphorus Tellurium Copper Base Alloy
The designation of high strength magnesium tellurium copper alloy is generally indicated by PDT. This kind of alloy is widely used in chemical industry, machinery, welding and other manufacturing industries by virtue of its excellent cutting performance, electric arc resistance, corrosion resistance and conductivity, and high productivity [SCALE STEEL]of manufacturing parts, low cost performance. And because of its good cutting performance, it can be used to make a variety of cutting device cutting nozzle, welding head, battery electrode and other aspects, and this kind of alloy non-toxic can also be used to make life supplies, such as utensils, etc..
C14500 tellurium copper alloy is a new alloy material with 0.40-0.70% tellurium and 0.004-0.012% phosphorus in copper. The bar made of it has excellent cutting performance. It can be used for high-speed cutting on the automatic lathe, and the cutting is not filamentous. It has been widely used in Europe, America, Japan and other [SCALE STEEL]developed countries, mainly used for: high conductivity, high conductivity, corrosion resistant precision electronic and electrical components, advanced mechanical and electrical parts, casting and thread cutting parts, plumbing fittings, electrical contact parts, automobile parts, welding and cutting advanced nozzle, motor and switch parts, etc. Can be made into round bar, hexagonal bar, special-shaped bar external supply.
High-conductivity tellurium copper alloys used in electrical contact materials are mostly produced by companies in the United States, Europe, Japan and South Korea. Through the relevant analysis of the shoe copper alloy market, we can clearly recognize that tellurium copper alloy has superior performance, its wide application prospect and potential market has been widely recognized. But at the same time, the market [SCALE STEEL]feedback is high processing costs, the main alloy component tellurium market is high and the material is strategic, so only a part of the high precision products used in tellurium. The development of tellurium copper alloy rod has just started in China, luoyang, Sichuan, Shenyang, Guangdong, Zhejiang and other places have started trial production, market potential is great.
Alloy product testing program
(1) Casting Process Parameters
In order to explore the casting process and find out the excellent process parameters, two different crystallizers with copper inner sleeve and copper and graphite inner sleeve were used in the industrial test, and two kinds of water pressure and casting speed were used to compare the performance of the ingot, so as to determine the best [SCALE STEEL]process parameters.
In addition, in the test process, in order to reduce the cost and minimize the accumulation of materials, we first get smelting experience in the medium frequency furnace, and then use the power frequency induction furnace for production. In the trial production of the power frequency induction furnace, we use the way of half furnace melting and single casting.
(2) Extrusion And Drawing Process Parameters
The mechanical properties of tellurium copper alloy rod is the second difficulty in the research and development work. The way to solve this problem is to optimize the combination of extrusion and drawing technology, in order to meet the performance requirements without annealing, considering the reasonable combination [SCALE STEEL]of performance requirements and cost. In order to improve the surface quality of the product, water seal extrusion is used when extrusion, and the ingot cast by iron mold must be turned and milling before extrusion. In order to explore and optimize the extrusion process, two extrusion schemes are formulated, respectively extrude A ф 31mm, ф 35mm bar blank, and then stretch, the mechanical properties of the finished products are tested. The extruded products should be pickled before stretching, and the elongation coefficient of each stretch time should be calculated respectively to make the processing rate of each pass more uniform. [SCALE STEEL]Material, hardness, required mold and equipment performance should be considered in the design of drawing passes to ensure that each pass can be successfully completed.
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