JPS58126945A - Manufacture of rare earth cobalt magnet - Google Patents

Abstract

PURPOSE:To improve production efficiency in manufacturing titled magnet and stabilize magnetic characteristics by heat treating an alloy ingot containing rare earth metals and Co of specified composition, solution treating and homogenizing it as it is, and ageing for magnetic hardening. CONSTITUTION:An alloy of desired composition, for instance Sm (CO0.594Fe0.32 Cu0.07Zr0.016)7.9 is prepared by melting an ingot of R2Co17 group metallic compound in inert atmosphere. R represents one or more of rare earth elements including Sm and Y, Ce, and M represents combination of one or more of Ti, Zr, Hf etc., and 0.1<=X<=0.4, 0.01<=Y<=0.1, 0.001<=Z<=0.1, 6.5<=A<=8.8. The alloy ingot is heated to 1,100-1,200 deg.C in Ar gas atmosphere, kept at 700-900 deg.C for 2-50hr and cooled. The cooled ingot is crushed and mixed with organic binder. Then, it is formed in magnetic field and cured. Thus, a resin bound rare earth cobalt magnet of desired shape is manufactured cheaply and allowing mass production.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a permanent magnet of the type R,003, containing a rare earth metal (hereinafter referred to as R) and a 00 intermetallic compound qivcco. R(Col-X-y-zFe
xOuyMsnA (where R: 8mj> and one or a combination of two or more rare earth elements centered on C@, M: one or two of Tie Zr tBf e Eii *Muj * M Oe Or e V +W Combination of species or more α1≦×≦α49α01≦Y≦α1.
Alloys made with 0.001≦Z≦α19&5≦A≦a8) have a high residual flux density (Br) and a coercive force (!I
It is a practical permanent 6 stone with a large H (1, 10), a high temperature, and excellent characteristics. Conventional main system R1Co,
Y-type permanent magnets have been manufactured by melting, casting, pulverizing, powder, magnetic field forming, sintering, heat treatment, and magnetization. % of heavy alloy magnets are sintered-Neppo Riko i! The six ki characteristics are determined by this. In the sintering range of 1100℃~120'0℃, A
re! ! This is carried out in an inert atmosphere such as e.g. or in vacuum. Subsequently, solution treatment was performed at 1000 to 1150°C in the same atmosphere, followed by rapid cooling to below 50°C, followed by an IC treatment of 400°C to 9°C.
It is heated to 00°C and subjected to aging treatment mt-. Usually, it is magnetically hardened using the Koushitomo method to increase coercive force. However, with the sintering method, satisfactory magnetic properties cannot be obtained without undergoing such a complicated heat treatment process, and it is quite difficult to reduce large variations. In addition, in order to carry out large-scale menstruation, it is easy to use a large amount of equipment.The object of the present invention is to improve a resin-bonded foundation stone. That is, (1) heat treatment is performed in the form of an alloy ingot, which stabilizes the S gas properties and improves performance, and facilitates mass production. In addition, the variation in magnetic performance can be extremely reduced. 0. By subjecting the ingot to solution homogenization treatment and then subjecting it to an aging treatment for magnetic hardening, production efficiency and stabilization of magnetic properties can be achieved.

If this book is specifically detailed, Rg 001? The intermetallic compound ingot is melted in an inert atmosphere to produce an alloy with a desired composition. The macrostructure of the alloy ingot is predominantly columnar. Next to VC r 1100℃ in glass atmosphere
Heat to ~1200°C for 4 to 50 hours, then continue to heat at 70°C.
It is assumed that the process consists of heating and holding at mWl of 0° C. to 900° C. for 2 to 50 hours and cooling. At this time, the solution treatment is
In order to homogenize the casting structure, the next step was rt6 aging treatment.
In order to create a uniformity of the precipitate, preferably 110
Preferably, the temperature is 0°C to 1180°C for 4 hours to 24 hours. Aging m at cooling rate ffl from solution treatment, 2°C/min to 50°C/min
It is desirable to reach fK. If the aging temperature is below 700°C, precipitation hardening will be insufficient, and if it exceeds 900°C, coarsening of the precipitates will occur, which is unsuitable. When the cooling rate wjL after aging is less than α1°C/min, it is industrially undesirable because the tube requires a long time, and when it is more than 30°C/min, it is insufficient for the formation of precipitates. In this way, solution treatment and aging can be performed in the same furnace and in the same process, so that it can: ■ Prevent the generation of non-uniform precipitates during cooling; ■ Improve industrial productivity; Braking force 1 for the generation of precipitation nuclei due to heating is eliminated 1
You will get a lot of effects. The ingot that has undergone the necessary heat treatment is crushed, mixed with organic 9-component pinter, molded in a magnetic field, and cured, thereby making it possible to mass-produce magnets of desired shapes at low cost.

The present invention will be explained below with reference to Examples.

*: m Example 1 8n+ (('O1+n*Feo-a*oua, oyZ
An alloy of 30 mm and 30 mm was cast in a high-frequency melting furnace into an iron rust mold.

The macrostructure of the alloy ingot was columnar as a whole. Next, the alloy is heated and heat treated in a precision tubular furnace while flowing IAr gas α41/1 lkf.

FIG. 1 shows an example of a conventional heat treatment pattern in which the heat treatment was carried out in 12 times (referred to as solution treatment CBF3T) and aging (referred to as AGK). FIG. 92 shows a heat treatment pattern according to the method of the present invention. In the conventional method, a heat treatment furnace T-2 was used, but in the method of the present invention, the same furnace was used.

Note that cooling rate 1 from IRt diagram BETgf (1150°C)
1rt, %10℃/min"t'500℃1 te, cool tj
j.

The cooling rate after the aging treatment was 2°C to 5°C/min up to 300°C. At temperatures below 300°C, there is no possibility of precipitate formation, so temperatures below n are ignored and heat treated for 7 hours, then coarsely ground with a T-stamp mill, and then finely ground with a ball mill to a particle size of 2μ to 50μ. Add and knead the fcl fine powder thus prepared and one-component epoxy resin T1,9 wt.
A 15×1 oxt 3% prismatic sample was pressure molded without applying an applied magnetic field of 18 KOθ. 145℃xt5 for the molded body
Cured by heating for an hour. As shown in Table 1, the characteristics of the cord produced in this way are xHQ UK/x compared to the conventional method.
Ho (squareness) t-takara-rtb was able to be obtained.

The 6-air characteristics of the method of the present invention are the same as those of the conventional sintered 8mC0@
It is extremely beneficial to the industry that it is now possible to provide magnets of the 1 level.

Example 2 8 m (C6, H*-V Fev 0u6-6y Z
r641H) Change in alloy IV of composition q, H V=0.
28. α30+CL54+α40 4 types were melted and cast in a high-frequency melting furnace. For casting, 1 kI of each was poured into a mold. The macrostructure of the ingot was mainly columnar. Here, we increased the amount of iron (Fa) and investigated changes in xHa and saturation magnetization (4π ■ θ).
The sample was treated with the heat treatment pattern shown in the figure. The furnace is the same, and the atmosphere rJAr gas (L2~α41/-
A friend who goes in a state of flux. The alloy ingot was roughly crushed and formed into 6 stones under the same conditions as in Example 1, and evaluated using a B-H measuring machine. In the conventional heat treatment (same pattern as in Figure 1), for example, V = α34. It was possible to obtain xHo of about 4 KOel for xHa, and about 10 KOe for the high iron assembly system using the single force sword method, which was difficult to put into practical use with permanent sharpening stones. The aim of the non-examples was to have the effect of expanding the practical permanent S-stone composition range of intercalary compounds. In other words, the price can be reduced by reducing the amount of CO, which has become expensive in recent years.
t9 It has become easier to put it into practical use as an industrial material and 4πIa
The effect of accelerating the practical application of resin-bonded magnets having a high t-value and high energy accumulation was also obtained. FIG. 4 shows the correlation between the change in V(Fe) and [(o, 4π) in non-example.

As detailed in the Examples, the method of the present invention improves the performance of resin-bonded magnets and increases industrial productivity, and is beneficial to the industry.

[Brief explanation of the drawing]

Figure 1: Heat treatment pattern of conventional method (!l!Example Conventional Figure 12: Heat treatment pattern of the method of the present invention (Example 1)
) Figure 3...Heat treatment pattern m4 of the method of the present invention that fails in Example 2...Execution? A diagram showing the correlation between changes in Fe (V) and XHo + 4π at 112Vc. Applicant Suwa Seikosha Co., Ltd. Agent Mogami Patent Attorney / Figure 2

Claims (1)

[Claims] RCCo1-x-y-xhaxOuyMz)A (where R: one or more combinations of rare earth elements centered on 8m and Y + Oe t-, M: Ti. ZrtHfe81+AJ *Mo+Or+V+ Combination of W01 type or Fi2 or more α1≦×≦114.αo1
≦Y≦α1rlOD1≦Z:l;111 &5≦A≦
a8) 't' table size n, 6 sets of alloy ingots) heat treatment, crushing, mixing binder, molding during molding, curing resin bonded rare earth; 1 in the manufacturing method of Pulte magnets
000℃ to 700℃ in the cooling process immediately after solution homogenization treatment at 1200℃? A method for producing rare earth cobalt magnets that undergoes aging treatment and magnetic hardening at one time after OOC.