qvod电影 快播电影 伦理电影 电影天堂
qvod电影 快播电影 伦理电影 电影天堂
qvod电影 快播电影 伦理电影 电影天堂
qvod电影 快播电影 伦理电影 电影天堂
qvod电影 快播电影 伦理电影 电影天堂
qvod电影 快播电影 伦理电影 电影天堂
qvod电影 快播电影 伦理电影 电影天堂
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新闻 -- Wear-resistant elbow elbow comparison with the traditional -- Splendid precision of Qing Yun county casts Ltd.
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Wear-resistant elbow elbow comparison with the traditional
【 Source： 】 【 Addtime：2010-02-01 】 【 Font：Big Middle Small 】
Wear elbow to get the favor of the market and continue to replace some traditional anti-wear material, the root cause lies in its excellent product quality, as well as with traditional anti-wear materials, such as cast stone, cast and centrifugal casting ceramic material in comparison to possess many advantages.

(A) Performance Comparison

1. Cast stone

The bend of each plant before most of them are using cast stone elbow, this material is characterized by brittle, cracking and surface wear backpacks, wall thickness 25-35 mm, some close to 40 mm, inside a short time frayed and split open, pulverized coal as the gap to the outer wear, their life, it was only an overhaul period. And often within the pores, easy to stay hidden, once Mo Chuan, live beyond repair.

2. Cast

Cast steel (including alloy) is widely used in wear areas, its manufacturing process is relatively simple. But the material itself due to the performance limitations and process constraints, the surface hardness of steel materials (about 60) was much lower than the ceramic (80 above), the wear resistance equal to only a few tenth to a lower ceramic, (see specific data Powder Metallurgy, Central South University of the wear test report and the Japanese island of Kyushu Institute of Industrial Ceramics jet wear test results), with its manufacturing elbow has put into operation more than a year on the Mochuan situation. In addition, the thickness of steel pipes large, very heavy, and the high carbon content, relatively poor weldability required to spot weld heat treatment, to the on-site installation and maintenance of considerable difficulty.

3. Centrifugal casting ceramic composite pipes

The process uses centrifugal casting method of self-spreading shape, using mainly their own material and chemical reactions, exothermic combustion temperature, combustion wave spreading in the process of synthesis of new materials technology.

This method forming the inner surface of the ceramic composite pipes replaced a ceramic layer, and carbon steel, manganese steel compared to the improvement of wear resistance to a certain extent, but due to reaction temperature is not high (an average of no more than 1200 ℃), reaction time short, to restore the out of alumina still remained at low-temperature phase β-Al2O3, and failed to convert the high-temperature phase α-Al2O3 (change in temperature is over 1300 ℃). With the alumina, but the high temperature phase of alumina and alumina low-temperature phase between the strength, hardness and density performance worlds apart. Because the response time is short, low-temperature phase of alumina and molten iron centrifugal separation is not complete, resulting ceramic layer is not dense and loose particles, hardness low. Wear elbow lining paste 95 ceramics, alumina content is not less than 95%, and all high-temperature phase α-Al2O3, the sintering temperature up to 1670 ℃, to ensure the material quality. From a practical look at the effect of wear, wear elbow and durable time is composite ceramic bend over 5 times.

And the centrifugal casting composite ceramic tube technology decision is made not suited to bend and size of the head, general technical conditions, the composite ceramic tube can only be made straight, and making a bend or size of the head, must be divided into a number of straight pipe Duan welding, molding and size of the first bend after the wall is not a streamlined structure which will hinder material handling and reduces to contribute.

Meanwhile, the kinds of technology produced by ceramic tubes, micro-cracks and more brittle and fragile, easy to partially off failure, but after falling beyond repair.

In addition, from the hanger bearing capacity of the boiler, the steel elbow, composite ceramic elbow are based on the weight and thickness to win, and some elbow wear and tear facing the wall more than 40 millimeters thick, from the machine design, was undoubtedly hanger increase in weight, shortening the service life.
Addtime：2010-02-01　　Views：130
 
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