Production Process Of Atomized Bronze Powder

Bronze powder is an important raw material for the production and use of powder metallurgy products

. Production of international industrial bronze powder began at 20 century. The production methods used at that time are restoring copper oxidation and electrolysis. After 1950s, there are new production methods for bronze powder: replacement precipitation and hydrometallurgy method. Then the atomization method emerges.

In 1958, China began the trial of bronze powder (FCu 663). It was about the production test of electrolytic bronze powder at that time. In the mid-1960s, electrolytic bronze powder trial to be successful and put small batch production. The mid-1970s, China has established a production line of the first electrolytic bronze powder. In the 1980s and 1990s, with the rapid development of China's national economy, the bronze powder was substantially increased. In order to meet market demand, the number of large enterprises by tapping the potential of innovation and technological transformation, the bronze powder production-fold. In the meantime, have established and developed more than l0 bronze powder manufacturers, National bronze powder production capacity of about 4000t, annual average production is about 1400t.

Alternative to electrolysis in the production of bronze powder, when the devaluation of the atomization milling method. Practice has proved that a single atomization production of bronze powder bulk density and poor formability drawback in practical applications can not be replaced by electrolytic bronze powder. Therefore, the use of water atomization, coupled with the subsequent treatment process, such as redox developed to meet the environmental needs of low bulk density of bronze powder.

Industrialization atomized bronze powder production method by gas atomization and water atomization method. Production practice proves that the production effect of water atomization gas atomization. The same particle size and particle size composition of the water atomization and gas atomization bronze powder, the same follow-up treatment conditions, the oxidation effect and the finished product bulk density is different. Study its causes, water atomized powder particle shape irregular powder than aerosolization, and thus more conducive to speed up the oxidation rate.

The oxidation process has great influence on the production of high-performance and low loose density bronze powders. It is found that in oxidation process, the oxidation time and oxidation temperatures have a great influence on the oxidation effect of metal powder. In particular, in the same oxidation time and oxidation temperature, oxidation is particularly affected the oxidation effect. Oxidation method is divided into static and dynamic in two ways. Static oxidation, the oxidation rate of the bronze powder is very slow, and prone to agglomeration; dynamic oxidation is not, so the oxidation effect is very good. Such as under in 5000C/3h condition, static oxidation of the bronze powder dynamic oxidation content is 7.5%. The bulk density is 3.80g/cm3.Dynamic oxidation content of bronze powder oxygen is 18.7% and bulk density is 2.32g/cm3.

AOR method of production of bronze powder, due to the microscopic shape of irregular, low oxygen content, good formability, process performance and stability, and it could replace the electrolytic copper powder. Require a higher friction material used in iron-based products and green strength carbon products. Several well-known powder metallurgy and electric carbon enterprises have use the powders in large-scale. It is found that the effect is very satisfactory.

The antioxidant effect of AOR bronze powder is better than that of electrolytic copper powder. Under the same conditions, the antioxidant effect of the AOR method bronze powder is 2 times than electrolytic copper powders. This is particularly important to manufacturers of diamond tools. Because these enterprises use a small amount bronze powder every time, thus requiring a long shelf life of the powder.Source:http://www.mhcmp.com

by: anelwew

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