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 pipe production process -- Splendid precision of Qing Yun county casts Ltd.
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Wear-resistant pipe production process
【 Source： 】 【 Addtime：2010-02-01 】 【 Font：Big Middle Small 】
　　Wear-resistant pipe is a self-propagating high-temperature synthesis - centrifuge manufacture. Is to seamless steel tubes on the centrifuge tube mold, in the steel added to a mixture of iron oxide powder and aluminum powder, which in the chemical mixture called thermite, centrifuge tubes reaches a certain speed rotation mode, via a Mars ignite thermite, thermite immediately their combustion, combustion wave spreading quickly, the following occurs in the spread of violent chemical reactions:

2Al + Fe2O3 = Al2O3 +2 Fe +836 KJ

3Fe3O4 +8 Al = 4Al2O3 +9 Fe +3265 KJ

Thermite reaction resultant of stabilized α-Al2O3 (ie corundum) and iron, while large amount of heat released. These heat such as adiabatic conditions, the adiabatic temperature can reach 3753K and 3509K, which makes steel pipe inside the original material as well as the resultant reaction, even if the melting point of 2045 ℃ corundum are also all turned into melt. Because the response very quickly, and only a few seconds, melt reactants under the centrifugal force, rapidly according to the proportion of size separation, the proportion of iron (7.85g/cm3) for Al2O3 ratio (3.95g/cm3) twice the iron heavier by centrifugal force, knocking pipe wall, a lighter Al2O3 are located in the inner layer of iron. Due to the rapid absorption of heat pipe and heat transfer, Al2O3, and Fe will soon reach freezing point, hierarchical coagulation. The final formation of wear-resistant pipes from the inside to the outside, respectively corundum ceramic layer over layer of iron-based, as well as the external steel layer, high-temperature molten iron liquid and Al2O3 liquid contact with the pipe wall, so that outside the pipe wall in the semi - dissolved state, so that the formation of iron metallurgical bonding layer and the steel, iron, corundum ceramic layer and between layers are combined to form a solid, its combination of pressure-shear strength (that is, out in the axial direction when the strength of the ceramic laminate) ≥ 15MPa; wear-resistant pipe crushing intensity (that is, from outside the tube when the tube crushing strength of ceramic) ≥ 350MPa;
Addtime：2010-02-01　　Views：102
 
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