FERRITE SINTERED MAGNET

• Main Authors: TAKAMI, TAKASHI, OGATA, YASUNOBU
• Format: Patent
• Language: English; French; Japanese
• Published: 24.03.2005
• Edition: 7
• Subjects: ARTIFICIAL STONE; BASIC ELECTRIC ELEMENTS; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; ELECTRICITY; INDUCTANCES; LIME, MAGNESIA; MAGNETS; METALLURGY; REFRACTORIES; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; SLAG; TRANSFORMERS; TREATMENT OF NATURAL STONE

A ferrite sintered magnet, which has a basic composition represented by the general formula: A1-x-y+aCax+bRy+cFe2n-zCoz+dO19 (atomic ratio)[wherein a,b,c and d are the amounts of A element, Ca, R element and Co, respectively, being added in the step of pulverizing an oxide magnetic material, and are figures satisfying the following requirements: 0.03 <= x <= 0.4, 0.1 <= y <= 0.6, 0 <= z <= 0.4, 4 <= n <= 10, x+y < 1, 0.03 <= x+b <= 0.4, 0.1 <= y+c <= 0.6, 0.1 <= z+d <= 0.4, 0.50 <= [(1-x-y+a)/(1-y+a+b)] <= 0.97, 1.1 <= (y+c)/(z+d) <= 1.8, 1.0 <= (y+c)/x <= 20 and 0.1 <= x/(z+d) <= 1.2. La présente invention concerne un aimant fritté de ferrite qui possède une de composition Basic représentée par la formule générale: A1-x-y+aCax+bRy+cFe2n-zCoz+dO19 (rapport atomique)[dans laquelle a,b,c et d sont les quantités de l'element A, de Ca, de l'élémenr R et de Co, respectivement, ajoutées dans l'étape de pulvérisation d'un matériau oxyde magnétique et, sont des nombres qui satisfont aux équations suivantes: 0.03 = x = 0.4, 0.1 = y = 0.6, 0 = Z = 0.4, 4 = n = 10, x+y < 1, 0.03 = x+b = 0.4, 0.1 = y+c = 0.6, 0.1 = z+d = 0.4, 0.50 = [(1-x-y+a)/(1-y+a+b)] = 0.97, 1.1 = (y+c)/(z+d) = 1.8, 1.0 = (y+c)/x = 20 and 0.1 = x/(z+d) = 1.2.