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 Posted: Sat 0:43, 20 Nov 2010 Post subject: ugg boots uk Sintering Process of NdFeB magnets _3 |
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Sintering Process of NdFeB magnets
. Magnet in the Adsorption of volatile substances or gases such as hydrogen, oxygen,[link widoczny dla zalogowanych], carbon and its compounds are more easily eliminated in a vacuum [33, the holes left by the flow of some Nd-rich phase filled, not filled, leaving a defect in the sample , making the lower level of the densification of the sample, the remaining magnetic flux density decreases, leading to energy product is also reduced. It can be seen from Figure 2,[link widoczny dla zalogowanych], the sample sintered magnets in the grain boundary is not obvious. Many of the white bright spot for the Nd-rich lamellar phase, a large main phase of black organizations, and other irregular black spots for the defects. NdFeB magnets Nd content is higher,[link widoczny dla zalogowanych], the more rich Nd phase, sintered Nd-rich phase when the melt into liquid, and flow, penetrate into the gaps between powder particles, the particles will also be rearranged, adjusted,[link widoczny dla zalogowanych], and make the sinter rapid densification j. Figure 2 is the white tissue inside the cavity Nd-rich phase defect left behind after evaporation. Contrast Figure 2a and Figure 2b, can be found in Figure 2b than in Figure 2a voids and other defects in fewer and smaller. This is because the sintering process,[link widoczny dla zalogowanych], high vacuum (<1.0 × 10Pa) sintered in favor of the timely discharge of volatile substances in L2]. NdFeB ternary phase diagram analysis shows 【4], Nd-rich phase (Nd content of 8O%, rest Fe) in the liquid state above 655 ℃, so the vacuum in the vicinity of 1080 ℃ burn, it will surely result in Nd-rich phase volatile, resulting in the sintering process of sintered Nd-rich phase less; while Nd-rich phase around the hole after volatile will make larger holes; part of the Nd-rich lamellar phase, after evaporation, the formation of a crystal clear sheet defects. In the sample sintered in argon, fewer of these defects (as shown in Figure 2b). Argon atmosphere in the sintering by, for safety reasons, but also to reduce costs, inflation pressure is usually 5.0 × 10Pa, and this vacuum of low pressure conditions (atmospheric pressure is 1.0 × 2 Magnitude , et al: NdFeB magnets sintered sintering process of Figure 2 SEM photographs of samples one by one ~ a vacuum sintering-b - argon atmosphere sintering 10jPa). Nd-rich phase is difficult to be volatile, so the rich have more references: Nd liquid flow, which filled the early after volatile gas and other impurities [1] solution Zhenlin, Tian Wei. Chen Liansheng. NdFeB permanent magnetic alloy sintering process leaving voids and other defects in, making the organization as shown in Figure 2b more uniform grain growth and aggregation of magnetic properties [J]. Rare Metal Materials and it is for the sample remanence, intrinsic coercivity magnetic properties such as references to comprehensive engineering, 2003,32 (4) :264-267. High, H-B curves of the rectangular degree of testing and better (see Figure 1). [2] Tan Chunlin, Shu-Xin Bai, Zhang Hong. Tempering materials on sintered NdFeB permanent magnet material 12 Group 3 Conclusions (1 Organization): 6 and 4 - 66 of magnetic. A pair of Chinese non-ferrous metals can impact of '2 OO2 ・ above results show that the protective argon sintered samples [3] TenaudP, LemaireH ・ VialF ・ Recentimprovementsin magnetic properties and microstructure of the consistency ratio should be sintered in a vacuum NdFeBsineredmagne [J] ・ Mg \:. One. . 2 'a pavilion MA / m high-energy product Guo mIj. Therefore, Lu 1 North junction NdFeB permanent magnetic materials preparation process, the sintering process of deflation [5] Yuxgg, Qigch, zh. Tichn. Effect. f After the protection should be argon filled. So, - TYNN to SitNdFBMg. tMi. tt. Mg. ti. P to avoid opening a mechanical pump, Roots pump and diffusion pump and other high-power electrical design formanceEJ]. Speci1Ste1, 2003,24 (5) :16-18. Equipment to save energy, but this can improve the product better pass rate and integrated magnetic properties. To meet the needs of information technology to expand academic exchanges of the channels have joined the magazine \On the publication of copyright royalties to use one-time charges and benefits. If authors do not agree with the article into the database, please declare manuscripts, publication will be properly addressed. Moreover, according to \The editorial department moved one by one hundred%, respect one percent visions one by one peak
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