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<table cellpadding="3" cellspacing="0" width="100%" class="forumline"> <thead> <caption><table border="0" cellspacing="0" cellpadding="0" width="100%" class="forumheader"> <tr> <td align="left" valign="bottom" width="25"><img src="http://picsrv.fora.pl/AcidTechTiger/images/hdr_left.gif" width="25" height="27" alt="" /></td> <td align="center" class="forumheader-mid">Topic review</td> <td align="right" valign="bottom" width="25"><img src="http://picsrv.fora.pl/AcidTechTiger/images/hdr_right.gif" width="25" height="27" alt="" /></td> </tr></table></caption> </thead> <tbody> <tr> <th class="thCornerL" width="22%" height="26">Author</th> <th class="thCornerR">Message</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>lompiacv</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/AcidTechTiger/images/post_old.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Tue 17:13, 18 Jan 2011<span class="gen"> </span> Post subject: Moncler online High-strength Nb-Al intermetallic c</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">High-strength Nb-Al intermetallic compounds and the development of smelting technology <br /> <br /> <br />Material. They also discussed the Preparation of a precision casting parts, with a high melting compound and technology development of the small 々 27 BU induction skull melting method is to ask trial Nb belly casting compounds,<a href="http://www.monclerjackens.net" target="_blank">Moncler online</a>, and has been successful. Nb-AI binary system with Nb, A1 (AI5 phase), Nt) (phase) and Al, Nb three compounds, but in the state diagram on the composition of the coverage is not determined. This study used induction skull melting method to take samples, l873K heat 7 x-ray diffraction congested nose after observing the levitation melting. High temperature x-ray diffraction observation of field tests, modified the traditional binary state diagram. In the modified state diagram, Nb, AI single-phase range from a 20at% A1 Nb to Nb a 23at% A1, the composition range of state of the map than the traditional narrow, and the niobium side of the movement. It is noteworthy that the stoichiometric composition of Nb-25at% A1 at room temperature for a (1873K heat treatment) is not NInAI single phase, but the Al + Nld two-phase state. The results show that. Nb-A1 system Al5 type of aluminum atoms in the lattice structure and stability of niobium atom positions are not completely rule in the state,<a href="http://www.monclerjackens.net" target="_blank">Moncler jacken</a>, but the package sets the replacement of niobium and aluminum atoms and lattice irregularities such as lack of road. So you can consider adding in the element Nb in solid solution to strengthen the crystal structure. Select the third element tungsten and molybdenum. Nb intermetallic melting technical problems to be solved there are three: First, the uniformity of molten material; the second is control of high precision components; third smelting technology of high purity. Taking into account the above points,<a href="http://www.uggsstivali.org" target="_blank">ugg italia</a>, the use of high frequency induction skull melting metal smelting NbAl asked compounds, which turned the research of high melting furnace heat. This section of the furnace are divided into 16 water-cooled copper crucible and the split-type large-capacity power supply, can be melt mixing and melting the atmosphere through the control components for high precision control of melting. Deviation of each component can be controlled in lat% less oxygen and nitrogen impurity element tangled in 3 × 10% less carbon-l × 10% less; and that these impurities are the raw materials with people. When the pollution is not melting. This method can be used include NbAl Fund melting intermetallic compound including a variety of 9-1o niobium alloy, melt the weight up to 10kg. Casting mold material requirements used in contact with NbAl melt does not react, do not melt and thermodynamic properties of stability. Japanese study of various oxide materials. Yttrium oxide was selected. Yttrium oxide in the cast in a mold casting is a precision three-dimensional free surface of the leaf-shaped, composed of a Nb 19at% A1, and the cast with no burning, no cracks and good appearance. And no reaction layer surface structure, phase and chemical composition are uniform. Prepared by the above method of turning a variety of lines cut into tensile test ingot sample films, the following tensile test at 2073K, a strain rate of 5x10. Tian plus tungsten and molybdenum in the Nb-A1-X ternary system, high temperature strength are greatly improved, and in the vicinity of the AI5 stoichiometric composition with the highest intensity of single-phase state. Nb a 20at% A1-5at% W alloy in the time of maximum intensity l873K l42MPa, and Nb a 26.1at% A1-4.4at% Mo the maximum intensity in the l873K was 130.2MPa, the highest strength aluminum when Taiwan, one volume and Nb-A1 w Department of Al-rich side than the bias and improve the 6at%, which Nb-A1 ternary system phase diagram of a Mo phase region in the A15 to the closely related Al-rich side of the expansion of the morning. Fund of the two Nb intermetallic compound specific strength than traditional body-centered cubic lattice structure is 20% or more niobium Jishejinti expected as gas turbine blades and other aircraft engine materials. Platinum, molybdenum and its alloys to take advantage of a variety of small cross section ion beam-based study of modern work has been made in various fields of technology, widely used enough. Produce 30-100A Current and l0-25keV energy ion source required a lot of technical issues raised. 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