Overview of isostatic graphite:

Isostatic pressure graphite is made of high purity graphite. Isostatic pressure graphite is a new product developed in the past 50 years in the world, which is closely related to today's high technology. in

Current situation of isostatic graphite in China:

As a global manufacturing country and photovoltaic product producer, China has always maintained a huge demand for isostatic graphite. In recent years, with the rapid development of domestic photovoltaic industry, the demand for isostatic graphite in China is increasing year by year. At the same time, due to the weak technical foundation of China's isostatic graphite production enterprises and the technical blockade of foreign enterprises, the production and quality of China's isostatic graphite have not been effectively improved. In 2011, the demand for isostatic graphite in China reached 18000 tons, while the output of isostatic graphite in the same period was only 9500 tons, and the supply gap reached 8500 tons. At present, the problems of insufficient technology reserve and unreasonable product structure are difficult to be solved in a short time.

The main applications of isostatic graphite are as follows:

Graphite material for Czochralski silicon furnace

Semiconductor single crystal furnace uses graphite material to make Tongguo, heater, heat shield and accessories. Specifications of supporting graphite parts are as follows:

Graphite mould for non ferrous metallurgy continuous casting

In order to shorten the production process, reduce the cost, improve the quality, reduce the labor intensity and environmental pollution, over the past 20 years, the production of metal materials has gradually developed towards the direction of continuous casting.

Up to now, the continuous production of copper and aluminum has been basically realized. High purity graphite is used in the mold, and the continuous casting output of steel has reached more than 80% (but most of the mold does not use graphite).

Isostatic pressure graphite is mainly used in large copper production line. Since 1985, China has introduced more than 30 production lines from Austria, France, Switzerland, Japan and other countries, while the number of domestic production lines designed and manufactured by ourselves has reached more than 100, all using graphite crystallizers.

According to statistics, China's copper output in 2006 has reached more than 3.6 million tons, most of which are continuous casting. Based on the requirement of 2.5kg graphite per ton of copper, the annual demand of graphite is 486t, and the annual demand of graphite blank is 2700t based on the processing yield of 70%. It is predicted that the annual graphite demand will be about 4000t in the near future.

Graphite EDM for EDM is a revolution in die industry. It not only simplifies the traditional technology, but also makes it possible to manufacture special-shaped die. Due to its isotropy, isostatic pressure graphite is the material for the manufacture of spark graphite electrode.

Production of graphite material for quartz crucible mould with monocrystalline silicon

The quartz crucible is the container of Czochralski silicon, while the graphite crucible is used as the molding material to make the quartz crucible.

Other industry applications of isostatic pressure graphite:

In addition to the above several main uses, isostatic pressure graphite is widely used in the fields of cemented carbide (vacuum furnace heater, sintering plate, etc.), mining (making bit mold), chemical industry (heat exchanger and anti-corrosion parts), metallurgy (Tongguo), machinery (mechanical seal), aerospace (nozzle, etc.), graphite reactor (reducer and reflector), etc.

Introduction of foreign manufacturers of isostatic graphite:

Russia and Poland: the development level of isostatic pressure graphite in the two countries is equal, and the development time of the latter is about 20 years later. Due to insufficient investment, the product quality level is far behind that of the United States, Germany, France, Japan and China, which is still in the stage of development and improvement.

Japan: Japan attaches great importance to the development of isostatic graphite.

At present, Japan's isostatic graphite has reached the world advanced level in terms of output, quality, variety, specification and expansion, which is mainly reflected in: many enterprises engaged in the development of isostatic graphite * many: Toyo Carbon Co., Ltd., Toyo carbon (Kapeng) Co., Ltd. (merged by Toyo Carbon Co., Ltd. in 1992), Donghai Carbon Co., Ltd., and new Japan Science and technology Carbon Co., Ltd , yifeichuan Electric Industry Co., Ltd., Dongbei Xiehe Carbon Co., Ltd., Toshiba Ceramics Co., Ltd., Hitachi Chemical Industry Co., Ltd. and Zhaohe electrode Co., Ltd. More product varieties: more than 100 isostatic inks; product specifications *.

*Japan's isostatic pressure graphite is not only used in semiconductor, solar energy, metallurgy, machining, atomic energy and other industries, but also in bioengineering, motor manufacturing and other fields. Total output * high: according to statistics from 1995 to 1996, the annual production capacity of isostatic graphite in Japan is about 13000 tons. In 2008, the total production capacity of isostatic pressing graphite materials of Japanese companies reached about 30000 tons / year, with a rapid growth rate.

The situation of isostatic pressure graphite in China

The development of isostatic pressure graphite (isotropic graphite) in China in the early 1960s, the research of isostatic pressure technology was started in China, and the trial production of carbon, graphite and other powders was carried out. In the mid-1960s, small-scale cold isostatic presses were introduced from home and abroad, and the field of experimental application was further expanded

The manufacturing work is mainly carried out in scientific research institutes and has not formed mass production capacity. In the late 1970s and 1980s, China's carbon production enterprises: Jilin Carbon Factory, Dongxin electric carbon factory, Harbin electric carbon factory and Shanghai Carbon Factory respectively added cold isostatic compressors for carbon material trial production, becoming the first batch of domestic enterprises trying to produce isostatic graphite. Xi'an 43 Institute and Beijing 703 Institute are national defense and military enterprises. They are equipped with cold static compressors and hot static compressors. The graphite materials developed by the Institute are mainly used in aerospace, aviation and other national defense related fields. They have not participated in the development of large-scale high-purity, high-density and high-strength graphite materials. They have only been discussed in theory and have not participated in the market competition.

Main isostatic pressure graphite in China