ÿþ<HTML> <HEAD> <TITLE>Anisotropy AlNiCo Alloy Magnet</TITLE> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META name="keywords" content="alnico,alnico magnet,alnico alloy,anisotropy alnico,anisotropy alnico magnet,anisotropy alnico alloy,anisotropy magnet"> <meta NAME="description" CONTENT="Anisotropy alnico magnets are oriented by heating above a critical temperature, and cooling in the presence of a magnetic field, anisotropic alnico alloys generally have greater magnetic capacity in a preferred orientation than isotropic types"> <STYLE TYPE="TEXT/CSS"> <!-- A { text-decoration: none } A {color:#000000; font-family: Helvetica, Arial; font-size: 10px; text-decoration: none;} A:hover {font-family: Helvetica, Arial; font-size: 10px; text-decoration: none;} td {font-family: Helvetica, Arial; font-size: 11px;} .linkcell {padding-left: 10px; font-family: Helvetica, Arial; font-size: 10px;} hr {color: #000000} //.unnamed1 {font-family: Arial, Helvetica, sans-serif; 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Of the more commonly available magnets, only rare-earth magnets such as neodymium and samarium-cobalt are stronger. Alnico magnets produce magnetic field strength at their poles as high as 1500 gauss (0.15 tesla), or about 3000 times the strength of Earth's magnetic field. Some brands of alnico are isotropic and can be efficiently magnetized in any direction. Other types, such as alnico 5 and alnico 8, are anisotropic, with each having a preferred direction of magnetization, or orientation. Anisotropic alloys generally have greater magnetic capacity in a preferred orientation than isotropic types. Alnico's remanence (B<sub>r</sub>) may exceed 12,000 G (1.2 T), its coercivity (H<sub>c</sub>) can be up to 1000 oersted (80 kA/m), its energy product ((BH)<sub>max</sub>) can be up to 5.5 MG·Oe (44 T·A/m). This means alnico can produce a strong magnetic flux in closed magnetic circuit, but has relatively small resistance against demagnetization.</p> <p>Anisotropic alnico magnets are oriented by heating above a critical temperature, and cooling in the presence of a magnetic field. Both isotropic and anisotropic alnico require proper heat treatment to develop optimum magnetic properties  without it alnico's coercivity is about 10 Oe, comparable to technical iron, which is a soft magnetic material. After the heat treatment alnico becomes a composite material, named "precipitation material" it consists of iron and cobalt rich precipitates in rich-NiAl matrix. Alnico's anisotropy is oriented along the desired magnetic axis by applying an external magnetic field to it during the precipitate particle nucleation, which occurs when cooling from 900 &deg;C (1,650 &deg;F) to 800 &deg;C (1,470 &deg;F), near the Curie point.</p> <h2>Anisotropy Alnico Alloy characteristics </h2> <table width="564" border="1"> <tr align="center"> <td width="73" rowspan="2">Characteristics<br> Grade</td> <td width="37">Max Energy Product<br> (BH)<sub>max</sub></td> <td width="60">Residual Induction<br> B<sub>r</sub></td> <td width="56">Coercive Force<br> H<sub>CB</sub></td> <td width="53">Intrinsic Coercive Force<br> H<sub>cj</sub></td> <td width="57">Recoil Permeability<br> &micro;<sub>rec</sub></td> <td width="36">Density<br> d</td> <td width="52">Temp. Coefficient<br> &alpha;(B<sub>r</sub>)</td> <td width="31">Curie Temp.<br> T<sub>c</sub></td> <td width="45">Proposal Coercive Field</td> </tr> <tr align="center"> <td>MGOe<br>(kJ/m<sup>3</sup>)</td> <td>KGs<br>(mT)</td> <td>Oe<br>(KA/m)</td> <td>Oe<br>(KA/m)</td> <td>&#8212;</td> <td>g/cm<sup>3</sup></td> <td>%/K</td> <td>&deg;C</td> <td>KOe<br>(KA/m)</td> </tr> <tr align="center"> <td>AlNiCo35/5</td> <td>4.4-4.9<br>(35-39)</td> <td>11-12<br>(1100-1200)</td> <td>600-650<br>(48-52)</td> <td>630-680<br>(50-54)</td> <td>5.0</td> <td>7.20</td> <td>-0.02</td> <td>850</td> <td>2.5<br>(200)</td> </tr> <tr align="center"> <td>AlNiCo29/6</td> <td>3.6-4.1<br>(29-33)</td> <td>9.7-10.9<br>(970-1090)</td> <td>730-800<br>(58-64)</td> <td>755-825<br>(60-66)</td> <td>4.50</td> <td>7.20</td> <td>-0.02</td> <td>860</td> <td>2.8<br>(220)</td> </tr> <tr align="center"> <td>AlNiCo33/11</td> <td>4.2-4.8<br>(33-38)</td> <td>7.0-8.0<br>(700-800)</td> <td>1350-1450<br>(107-115)</td> <td>1400-1500<br>(111-119)</td> <td>2.20</td> <td>7.20</td> <td>-0.01</td> <td>860</td> <td>4.9<br>(390)</td> </tr> <tr align="center"> <td>AlNiCo39/12</td> <td>4.9-5.4<br>(39-43)</td> <td>8.3-9.0<br>(830-900)</td> <td>1450-1550<br>(115-123)</td> <td>1500-1600<br>(119-127)</td> <td>2.30</td> <td>7.25</td> <td>-0.01</td> <td>860</td> <td>5.2<br>(410)</td> </tr> <tr align="center"> <td>AlNiCo44/12</td> <td>5.5-6.0<br>(44-48)</td> <td>9.0-9.5<br>(900-950)</td> <td>1500-1600<br>(119-127)</td> <td>1560-1660<br>(124-132)</td> <td>2.50</td> <td>7.25</td> <td>-0.01</td> <td>860</td> <td>5.6<br>(450)</td> </tr> <tr align="center"> <td>AlNiCo37/15</td> <td>4.6-5.1<br>(37-41)</td> <td>7.0-7.5<br>(700-750)</td> <td>1800-1900<br>(143-151)</td> <td>1880-1980<br>(150-158)</td> <td>1.90</td> <td>7.10</td> <td>-0.01</td> <td>870</td> <td>6.7<br>(530)</td> </tr> </table> <div align="center"><br><img src="images/anisotropy_alnico.jpg" alt="anisotropy alnico alloy" width="266" height="208"></div> <div align="center"><br><img src="images/alloy_aniso.gif" alt="anisotropic alnico alloy demagnetization curve"></div> </div> <div align="right" class="style15"><SPAN class=style14>&lt;</SPAN> <a href="productsc4.html"><FONT color=#0066ff size=+1>back</FONT></a> <SPAN class=style14>&gt;</SPAN> <span class="style14">&lt;</span> <a href="productsc6.html"><font color="#0066FF" size="+1">next</font></a> <span class="style14">&gt;</span></div></td> </tr> </table></td> </tr> </table></td> </tr> <tr> <td height="13" width="241"> <table width="164" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="164" bgcolor="#990000">&nbsp;</td> </tr> </table></td> <td width="49" height="13"><img src="images/spacer.gif" width=49 height=1 alt=""></td> <td width="240" height="13"><img src="images/spacer.gif" width=233 height=1 alt=""></td> <td height="13" width="92"><img src="images/spacer.gif" width=89 height=1 alt=""></td> <td height="13" width="49">&nbsp;</td> <td height="13" width="76">&nbsp;</td> </tr> </table> <table width="100%" border="0" cellpadding="0" cellspacing="0"> <tr> <td height="34" bgcolor="#990000"><div align="center"><font color="#FFFFFF"> &copy; Since 2004 Yuxiang Magnetic Material Ind. 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