www.public4you.fora.pl

px941934

Sintered molybdenum in the cracks of slab

Molybdenum powder agglomeration bond more closely, suggesting that the microscopic particles and more small particles have higher surface energy, b crack fracture surface bridge effect \As the sintering temperature, the pre-burn deformed molybdenum powder particles further softening, was molten state, molybdenum powder particles increases the contact area, and more closely. melted under high temperature molybdenum powder particles increased and reached a peak of atomic motion , close bonding between the contact surface of molybdenum powder particles 33 No. 2 Liu Renzhi, etc.: sintering of molybdenum in the cracks of slab 41 * to provide atomic access to high-temperature heat energy and convert the kinetic energy required for high-speed movement, the kinetic energy large enough to overcome the potential energy between atoms, the two surface atoms of molybdenum powder particles of molybdenum powder by the first break the shackles of the original into a new molybdenum powder particle surface, then sintered to form the initial neck, with the further rise of temperature high atomic motion increases the contact surface increases, then two or more than 2 molybdenum powder particles gradually merged into a large molybdenum grain. repression hole formed in the process, it has gained in the pre-burn local improvements, along the hole in the direction of high-temperature sintering is not binding, so the direction of the grain growth of the holes more rapidly, gradually reduce the size of hole is much larger than its size hole on both sides of the metal atom motion can overcome the distance, with the sintering completed, cooling the emergence of sintered products are layered so retained. 4 Conclusion reunion of different states of molybdenum powder mixed, model,[link widoczny dla zalogowanych], pre-burn and sintering,[link widoczny dla zalogowanych], the fracture section of each process scanning electron microscope analysis,[link widoczny dla zalogowanych], detecting voids Evolution of the initial prototype and subsequent formation of internal micro-cracks or pores in the process, and discuss their analysis of the causes, draw the following conclusions: (1) molybdenum powder agglomeration effects susceptible to arch-pressure process in the formation of the initial empty; (2) during the burn due to the gravity of these holes have smaller scale; (3) hole size in the sintering process further reduced and ultimately become retained within the layer. References [1] Xu Zhichang Zhang Ping. molybdenum powder and the reunion of the similarity principle [J]. China's Molybdenum Industry, 1997,21 (3) :29-32. [2] Xu Zhichang, Zhang Ping. agglomeration of fine molybdenum powder and its effect on the molybdenum Sijia [ ,J]. China's Molybdenum Industry, 2001,25 (6) :86-87 In 2009 the main producer of molybdenum in the recent program cuts, most large molybdenum producers announced production cuts in 2009. U.S. Freeport-Mc-MoRan Copper & Gold Inc.: Plan American cut 10 million pounds Henderson Mine / year (annual production in the region 2008 to 4000 million pounds), cut mine in Peru CerroVerde 3 million pounds / year (2008 production of 300 million pounds). Canada ThompsonCreekMetals Company: plans to produce from 2000 to 2400 million pounds / year (2500 to 2008 produced 26 million pounds). Chile's Codelco,[link widoczny dla zalogowanych],: is expected to produce 50 million pounds / year (2008 production of 55 million pounds). Chile Antofagasta Mining: plans to produce 17.85 million pounds / year (2008 and 2007 production was 17.2 million pounds and 2250 million pounds). U.S. Kennecott Corporation: 2008 production of 23.37 million pounds, compared with 32,[link widoczny dla zalogowanych],850,000 pounds in 2007 has been reduced, has not yet revealed its plans for production in 2009, but given the the current low grade ore, molybdenum production is expected in 2009 will decline. (Source: \Global stainless crude steel production of 25.9 million t, down 6.9%, compared with 2006 decreased by 2%. 2008 4 quarter of the global stainless steel production by 30%, resulting in a sharp decline in annual production. by the financial crisis, Global vehicle production dropped significantly, so the global stainless steel crude steel fell to 4-quarter of the 4.8 million t, equivalent to the level of Q2 2004. In 2008 the main areas of stainless steel crude steel production are: (1) Asia (excluding China ): 8.1 million t (down 10.3%); (2) China: 6.9 million t (down 3.6%); (3) Western Europe and Africa: 8.3 million t (down 4.8%); (4) United States: 2.3 million t (down 11.1%); (5) Central and Eastern Europe: 333,000 t (down 8.6%). (Source: Antaike 2009-03-16)
More articles related to topics：

ugg boots billig Fluorite in refractory multiple m

uggs australia Status and prospects of foreign min

[link widoczny dla zalogowanych]