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Method for manufacturing micro motor magnet
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A manufacturing method and micro-motor technology, applied in the field of magnet manufacturing, can solve the problems of easy pulverization and corrosion, low Curie temperature point, poor temperature characteristics, etc. Effect
Inactive Publication Date: 2012-07-04
TIANJIN SAMSUNG ELECTRO MECHANICS CO LTD
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Problems solved by technology
[0002] At present, magnetic materials are used in various forms in electronic products to realize the magnetic functions of products; for example, the commonly used magnetic material NdFeB has the advantages of high cost performance and good mechanical properties; the disadvantage is that The Curie temperature point is low, the temperature characteristics are poor, and it is easy to pulverize and corrode; and it is difficult to achieve a circular area of 2.7mm 2 After reaching saturation in the range, control the magnetic field strength to more than 3500G
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Embodiment 1
[0020] A kind of manufacturing method that is used for micro-motor magnet is characterized in that comprising implementation steps as follows:
[0021] (1) The following components are mixed and prepared according to weight %:
[0022] Neodymium 23%-27%;
[0023] Praseodymium 4.5%-6.5%;
[0024] Boron 0.8%-1.4%;
[0025] Dysprosium 2.6%-3.2%;
[0026] Iron 61%-67%;
[0027] Cobalt 0.8%-1.2%;
[0028] Praseodymium and neodymium exist in alloy form, of which neodymium accounts for about 75-80WT% and praseodymium accounts for 20-25WT%; boron and iron exist in alloy form.
[0029] As a binder in powder metallurgy, cobalt can ensure that the cemented carbide has a certain toughness. Cobalt can reach a Curie point of 150°C.
[0030] (2) Mix the powders of the above components evenly and sinter to form a magnet. The sintering temperature is 1000-1100°C, and the sintering time is 6-8 hours; the primary curing temperature is 820-920°C, and the time is 2-4 hours; the secondary...
Embodiment 2
[0034] A kind of manufacturing method that is used for micro-motor magnet is characterized in that comprising implementation steps as follows:
[0035] (1) The following components are mixed and prepared according to WT%:
[0036] Neodymium 22.0kg;
[0037] Praseodymium 5.5kg;
[0038] Boron 1.2kg;
[0039] Dysprosium 3.2kg;
[0040] Iron 67kg;
[0041] Cobalt 1.1kg.
[0042] Others are with embodiment 1.
Embodiment 3
[0044] A kind of manufacturing method that is used for micro-motor magnet is characterized in that comprising implementation steps as follows:
[0045] (1) The following components are mixed and prepared according to weight %:
[0046] Neodymium 24kg;
[0047] Praseodymium 6.5kg;
[0048] Boron 1.4kg;
[0049] Dysprosium 2.9kg;
[0050] Iron 64.4kg;
[0051] Cobalt 0.8kg.
[0052] Others are with embodiment 1.
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Abstract
The invention relates to a method for manufacturing a micro motor magnet, which comprises the following steps of: (1) mixing the following components in percentage by weight: 23 to 27 percent of neodymium, 4.5 to 6.5 percent of praseodymium, 0.8 to 1.4 percent of boron, 2.6 to 3.2 percent of dysprosium, 61 to 67 percent of ferrum and 0.8 to 1.2 percent of cobalt; (2) mixing powder of the components uniformly, sintering to form a magnet at the sintering temperature of between 1,000 and 1,100 DEG C for 6 to 8 hours, performing primary curing at the temperature of between 820 and 920 DEG C for 2to 4 hours, and performing secondary curing at temperature of between 500 and 550 DEG C for 4 to 6 hours, wherein the vacuum degree is less than 7.8*10<-1>Pa; (3) manufacturing to form a magnet with the three-dimensional cylindrical appearance and the volume of 2.7*1 (mm<3>) according to convention, wherein the surface of the magnet is smooth and does not have foreign bodies; and (4) arranging anNi / Cu / Ni anticorrosion protective coating with the thickness of between 10 and 20 micrometers on the surface of the magnet. When the method is used, the magnet can provide enough magnetic flux and magnetic induction strength for a micro motor within a specific volume range, and can meet the requirement of the micro motor in aspects of coercive force and the spread of hysteresis curves, so that the stability of the field intensity of a magnetic field of the magnet in the normal temperature state is ensured effectively.
Description
technical field [0001] The invention relates to a method for manufacturing a magnet, in particular to a method for manufacturing a magnet for a micro-motor. Background technique [0002] At present, magnetic materials are used in various forms in electronic products to realize the magnetic functions of products; for example, the commonly used magnetic material NdFeB has the advantages of high cost performance and good mechanical properties; the disadvantage is that The Curie temperature point is low, the temperature characteristics are poor, and it is easy to pulverize and corrode; and it is difficult to achieve a circular area of 2.7mm 2 After reaching saturation within the range, control the magnetic field strength to above 3500G. [0003] Therefore, how to adjust its chemical composition and adopt surface treatment methods to improve it to meet the requirements of practical applications and ensure its performance is safer and more reliable to meet the needs of the mark...
Claims
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Application Information
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