JPS60103150A - Manufacture of alnico type sintered magnet alloy - Google Patents

Abstract

PURPOSE:To manufacture a sintered magnet alloy having high density and high magnetic characteristics when an alnico type sintered magnet alloy contg. Ti or Nb is manufactured, by using part of starting materials in the form of an alloy so as to prevent deterioration in the sinterability of the powdered starting materials by oxidation. CONSTITUTION:When an alnico type sintered magnet alloy having a composition obtd. by adding Ti or Nb to a composition consisting of Al, Ni, co and Fe is manufactured, Co and starting materials easy to oxidize such as Al and Ti or Nb as part of starting materials for the alloy are used in the form of a Co-Al- Ti or Co-Al-Nb alloy. Powder of this alloy is blended with other powdered starting materials such as Fe and Ni, and the blend is filled into a metallic mold, press-molded, and sintered at 1,200-1,300 deg.C to manufacture an alnico type sintered magnet alloy contg. Nb or Ti. The starting materials easy to oxidize such as Al and Ti or Nb are hardly oxidized, so the superior sinterability is maintained, and the resulting sintered magnet alloy has high density and high magnetic characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an alnico-based sintered magnet alloy containing Ti and/or Nb having high density and high magnetic properties.

Magnet alloys whose main components are Al, Ni, Co or Al, Ni with the remainder substantially Fe (hereinafter referred to as Alnico magnet alloys) have typical standards such as Alnico 1 to 8, and are generally manufactured using the melt casting method. It is manufactured by
Powder metallurgy is also used to manufacture products with complex shapes and small products.

By MSing alnico magnet alloys using this powder metallurgy method, that is, the sintering method, the complicated process from melting to solution treatment becomes an extremely simple process of mixing raw material powder, molding, and sintering, and also requires a runner. Since this is not necessary, there is an advantage that the overall yield is particularly improved compared to the conventional melting and casting method.

Alnico-based firing #+': As a manufacturing method of magnetic alloy,
Powders of each component element or its alloy such as At*Ni*Co*Cu, i"i, or TiH2rFeTi+Fe are mixed to obtain a desired chemical composition, and then molded, sintered, and A common method is to perform heat treatment. In this case, in order to prevent deterioration of magnetic properties due to oxidation, it is common to use Fe--M alloy powder instead of M.

- However, additives such as Fe--Al, Ti, and Nb are very easily oxidized, and when the above-mentioned single metal powder is used, poor sintering and defects are likely to occur. In particular, Alnico 8-based magnet alloys contain a large amount of Ti t Nb #γ in addition to At, which is one of the main components, so
'10- was more difficult to produce.

The object of the present invention is to improve the above-mentioned drawbacks of the prior art and to propose a method for fabricating an alnico-based sintered magnet alloy with a low sintered density and excellent magnetic properties.

Method for producing alnico-based sintered magnet alloy of the present invention Sea 1: Molding the raw material made of metal powder [7, Heat treatment after sintering the obtained J-shaped body (7: I'J-I Nl l C
o l li'e'47 living body and Tj and/or d
In a method for producing a sintered alnico yarn alloy containing Nb (i7.8 deposited metal), at least part of the raw material contains Co and Al, Tf.
○ As mentioned above, in the past, M, + Ti, and Nb, which are easily oxidized (mk2, nitrided), are used to form γ/
! If used in a hot pot, the raw material powder would oxidize, resulting in a decrease in the quality of frying. Therefore, Kinoe Sokusha etc. were 44+
As a result of various studies, α+ I'J-+ 'l+ was used as a raw material.
It has been found that by using an alloy powder containing Nb and/or Nb (hereinafter referred to as the present alloy powder), oxidation of the raw material powder is effectively prevented and the sintered density is improved. That is, the present alloy powder is chemically relatively Qi-rich, has excellent sinterability, and has a structure after sintering of L-/C.

The preparation of this alloy powder requires 1i of co, M, and Ti or Nb.
It is blended so that it has a ratio that corresponds to the composition of the rod A'
4"i' 4 (produced by mechanically crushing the /C alloy ingot obtained by arranging the pattern yarn and melting layer U1'
good.

In this case, since the main gold c, 1 has good crushability, it is easy to
tZ alloy powder costs 4 chiles! Take. Shall I crush it? 100 mesh V lower (
More favorable u: 250 meshes or less) is more favorable.

This alloy powder prepared in this way contains Ni, C
u.

A raw material is obtained by mixing with each powder of h. In addition, in this case, the prescribed eye (iI acid component is not included, phantom 1, Co.

b'e kl l T1. The components may be adjusted by adding or adding 1FcNb# powder. /, -None Unalloyed powder 100 from the viewpoint of blending powder for component adjustment and prevention of oxidation
The annual allowance is 7 to 10 parts by weight. The reason why Nl + C'ur Fe is not included in this alloy powder is that alnico thread alloy powder has very poor formability, but
This is because by forming a mixed powder, Cu and Fe # exhibit the effect of a metal binder.

When producing an alnico-based di-magnetic magnet alloy using the above raw material powder, it may be carried out, for example, in the following manner.

1 Zuhara■ end the end with gold 2+, Rinuri (filling -16 ~ 1 [
] H” chevron at a pressure of tormi, 1200-1300
Sinter in the range 1 Jlf of °C. The ψ connection is 112 on the vacuum instep.
It is preferable to line 7r inside.

Next, heat treatment is applied to this l# connection, and 1. tR materialization treatment 1. Exercising 1-C alnico sintering and cloth placement 4? It will be done. Here's the heat room" 1
11, solubilization treatment of rust at 900 to 1600°C, "1;
Hold the temperature at 0.5 to 111 degrees Celsius and heat it to 2 to 5 K.
5-60℃ at a temperature of 750-850℃
After holding the axis for a minute, I was released, and the statute of limitations was processed! l! It is appropriate to leave the aging at 500 to 700° C. for 10 to 10 hours (multi-stage aging may also be used).

The scope of the present invention is not limited.

Example 1゜1i”e -50M+ Ni, Co + Cu +
Conventional raw materials consisting of Ti, FeNb, and Fe powders and Co-Al-Ti-Nb alloy powder and N
The raw material according to the present invention, which is a mixture of powders of i, Co, and Fe, was mixed with 7.5% Al-15%Ni-66%Co.
-2,5%Cu-5%'f'i-[], 55%Nb-
% part substantially nJ-containing IC of Fe (9) was blended, and using these raw materials, the pressure of 6t/lri) J was ρ11.
A molded body of X 10 crnm was produced. The molded product of Jl- et al.
rr (/-) 4% 4'? Inside? Perform 5 knots, 1200-1250℃ x 1.1.5b (D solution treatment, 800-850℃ x 10 minutes, etc. (LA
li J,'+A % JJ4 and 5 from 650 °C
00'C21 time/j, 1jJ)), L barit alms 7
Ta. Determine the density and temperature after heat treatment. 1. -/Kotokoro, the values shown in Table 1 are obtained.
I did it.

Table 1 From Table 1, it is clear that the method of the present invention provides a significant improvement in density and magnetic properties.

Further, FIGS. 1(a) and 1(b) show the structures of sintered magnet alloys obtained by the conventional method and the method of the present invention, respectively. From the same figure, it can be seen that the conventional method (when FeNb powder is used, F
e-Nb does not diffuse sufficiently and remains (7), density p1
It is clear that the above is inhibited.

Example 2゜Ingredients were 7.5 M-15Ni-36Co in weight ratio
-2,50-5,5Ti -0,5Nb-73Co -15M -11Ti prepared to have residual Fe
-I Nb alloy powder, carbonyl Ni powder, Cu powder,
Mixed with Fe powder (present powder) and Koi-50A
t, carbonyl Ni powder, Cos, Co powder,
A powder (conventional powder) that is a mixture of Ti l (2 powder, Fe 70 Nb powder, and ■I'O powder) was mixed to give a typical 0 At -
The landscape ratio of Ti-Nb powder for a furnace was varied from 0 to about 50 degrees.

Using each mixed powder, the l+It type, sintering, and heat treatment were performed in the same manner as in Example 1, and the sintered body density and magnetic properties were measured, and the values shown in the second column were obtained.

Revisions to the use of Co-based gold powder, density, and chemical properties, and other matters for JJpf he 5
It is also clear that 0 MJ>rre powder, etc., can be used to a large extent if it is reduced by about 10%.

Example 6゜Car'lti: Ratio: 8.2 A/--14Ni-24C
o-2Cu-0,584-0,2Ti-U,5
Nb+ 8i, 73C to become Fe.

-25M -0,6'll'i -1,5Nb alloy powder and carbonyl Nj' AD r Cu e + Fe powder mixed powder (method of the present invention), Fe-50At, carbonyl N
i, Co powder + Co powder + Fe-30Tt powder,
Using a mixed powder of Fe-70Nb powder and Fe powder (conventional method), molding, sintering in IH2, cooling heat treatment in a magnetic field, and aging treatment β1! When I did this, I got the results shown in Figure 3.

1. Other than Alnico 8 yarn. It is clear from Table 3 that the invention can also be used in the case of "manufacturing H deposit money".

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are micrographs of gold-tone silk weave showing the shrinkage of alnico-based sintered 4iE4 stone alloys obtained by the conventional method and the method of the present invention, respectively. (Kawa Ji・°8 (C included)

Claims (1)

[Claims] An alnico-based sintered magnet alloy in which a raw material made of metal powder is molded, the resulting molded body is sintered, and then heat treated to obtain a magnet alloy mainly composed of AI-HNiHCo + Fe and containing Ti and/or oil. In the method for producing At r
Alnico sintered magnet alloy characterized by using alloy powder containing Ti and/or pigeon The present invention is a method for producing an alnico sintered magnet alloy containing Tt and/or teeth, which has high density and high magnetic properties. Regarding.