JPS5974253A - Manganese-aluminum-carbon alloy magnet - Google Patents

Abstract

PURPOSE:To obtain the titled alloy magnet with improved magnetic characteristics such as coercive force and energy product by adding restricted amounts of P and Ni to an Mn-Al-C alloy magnet having a specified composition consisting of Mn, C and Al. CONSTITUTION:A cast billet of an alloy prepared by adding, by weight, <=0.6 part P and 0.2-2.5 parts Ni to 100 parts alloy having a composition consisting of 68.0-73.0wt% Mn, (1/10Mn-6.6)-(1/3Mn-22.2)wt% C and the balance Al or by further adding 0.01-0.5 part Ti is subjected to soln. heat treatment at about 1,100 deg.C, cooling and warm plastic working such as extrusion. The resulting Mn- Al-C alloy magnet can be provided with improved magnetic characteristics. Said small amount of P increases the coercive force, and >=0.2 part Ni produces a significant effect on the magnetic characteristics, yet >2.5 parts Ni reduces the energy product. Ti increases the energy product furthermore when added by said amount.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a manganese-aluminum-carbon (Mn-aluminum-1-C) alloy magnet having completely improved magnetic properties.

The configuration of a conventional example of a leopard. Problems In recent years, Mn 6 B, O ~ 73.0% by weight (hereinafter simply expressed as %), c (i"n - e, e ) ~ (7Mn
-22,2)96 (Mn in the formula represents the weight percent of the manganese component), and the remainder A [Anisotropic Mn-Al-C alloy magnet with excellent magnetic properties was developed. (Japanese Patent Publication No. 54-31448). Also, Mn-A
Mn-A is an alloy with improved magnetic properties of N-C alloy.
71-C-Ni alloy (Japanese Unexamined Patent Publication No. 63-73411)
, Mn-kl-C-Ni-Ti alloy (Japanese Unexamined Patent Publication No. 1983
-83613), Mn-Al-C-P alloy (
Japanese patent application No. 57-3918) has been proposed.

This Mn-5L-C alloy magnet is already used in speakers, electrical equipment, etc., but the coercive force of the magnet becomes larger in equipment such as motors and generators where the magnet is subjected to a reverse magnetic field. In addition, due to the trend toward miniaturization of speakers, electrical equipment, etc., the energy product of magnets (B H) ma
x is required to become more dog-like.

OBJECT OF THE INVENTION The object of the present invention is to improve the magnetic properties of a Mn-AA-Q alloy magnet.

Structure of the Invention In order to achieve the above object, the present invention provides Mn -AN-
It is characterized by adding both phosphorus (P) and nickel (Ni) to the C alloy. Further, the present invention is characterized in that three elements, P, Nl, and further titanium (T1) are added in order to achieve the above object.

According to the present invention, the magnetic properties of the Mn-AA-C alloy magnet, particularly the medicinal magnetic force and energy product, can be improved.

Description of Examples The Mn-Al-C alloy magnet has an Mn-Al-C alloy magnet within the above composition range.
It is manufactured by performing warm plastic working such as extrusion working or compression working in the temperature range of Al-C based alloy'jz530 to 830'C.

Figures 1 to 3 show representative experimental data, in which a cast billet made of a Mn-AA-C alloy within the above composition range with both P and Ni added was subjected to solution heat treatment at 1000°C. Amount added after cooling to room temperature and then warm plastic working (extrusion ratio 6) (expressed as a percentage relative to the alloy 100)
Figure 2 shows changes in medical magnetic force (lHc) and (B H) w&x. The values of tHc and (BH) max are IHC of a Mn-A1-C-Ni alloy (Ni=o, s%) prepared under the same conditions.

(BH) It is expressed as a ratio to wax.

As shown in FIGS. 1 to 3, by adding both P and Ni, tHc after warm plastic working.

(BH) max is significantly improved compared to the Mn-41-C-Ni alloy, especially when 0.01≦P≦0.6 and 0.01≦P≦0.6.
IHC improves by 15% or more in the range of 4≦Ni≦2.0. (BH)max is 0.03≦P≦0.2, 0.4≦
The improvement is about 10% or more in the range of Ni≦1.2. Also P,
Regarding the amount of Ni added, if the amount of P added exceeds 0.6%, non-magnetic r phase will increase in the alloy after heat treatment, and if the amount of Ni added exceeds 2.6%, the amount of non-magnetic r phase will increase in the alloy after heat treatment. (Mn
-AA-Ni phase) increases, the residual magnetic flux density decreases significantly, and (BH)max also decreases. Further, IHC is improved even when P is added in a very small amount, and Ni has a large effect on magnetic properties when it is added in an amount of 0.2% or more. Therefore, the optimum amounts of P and Ni to be added are o<p≦0.6 and 0.2≦Ni≦2.6.

The reason why tic is improved by adding P and Ni is also not clear. However, in isotropic magnets obtained only by heat treatment, IHC does not improve even when P and Ni are added, but it improves in anisotropic magnets after warm plastic working, and P and Ni affect the phase state. As an effect, when the amount of P added is large, the transformation rate of ε phase (high temperature phase)-Pτ phase (magnetic phase) is slowed down, and when the amount of N1 added is large, it becomes faster. Inferring from the above, P and Ni are considered to have a large influence on the energy states of the main constituent elements Mn and Al, and these influences also affect the crystal 1/fO
Due to the effect of warm plastic working which causes grain refinement,
more promoted. It is thought that these factors act in the direction of increasing IHc.

Figures 4 and 6 show a cast billet made by adding the three elements P, Ni, and Ti to an Mn-Ll-C alloy within the above composition range, which was subjected to solution heat treatment at 1000°C and then air-cooled to room temperature. , Next, the change in lHc, (BH) max with respect to the added amount after warm plastic working (extrusion ratio 5) is shown.

However, the values of lHc and (BH) max are the values of Mn-Ll-C-Ni alloy (Ni: 0.8
%) to rHc, (BH) wax.

From Figure 4, regardless of the amount of tHc id Ti added,
It shows a large value almost the same as the tHc of Ni and P-added alloys.

From Fig. 6, with Ti addition of 0.01≦Ti≦0.5 (BH
) max is significantly improved. When we observed the structure of these alloys after heat treatment using a metallurgical microscope, we found that the P-Ni-Ti alloy is the same as the N1-added alloy and the N1-added alloy.
The crystal grains are smaller compared to the 1-P-added alloy, (
It is presumed that the improvement in BH) wax is due to the refinement of crystal grains due to the addition of Ti. From the above, P, Ni, T
The optimal addition amount of i is 0〈P≦Q6゜0.2≦Ni≦2.5
, 0.01≦T1≦0.6te.

Furthermore, the Mn-mu 1-C-P-Ni alloy of the present invention, and the Mn
-kl-C-P-Ni-Ti alloy was studied by adding small amounts of iron (Fe), boron (B), and copper (Cu), each singly or in combination, and the magnetic properties of each were
Alloy without addition of l, B, Cue (Mn-A#-C-P-
Ni alloy, Mn-kl-C-P-Ni-Ti alloy), there was a tendency for it to be almost the same or slightly improved.

Example 1 Mn70.0%, A12 ea, ts%, Co, 5%
A cylindrical alloy billet with an outer diameter of about 18 mm was prepared by melting and casting, and the billet was heated at 1100° C. for about 1 hour and then heated in a furnace. This fillet was extruded at a temperature of 700°C (extrusion ratio 6). When the magnetic property values of the alloy in the dominant magnetization direction after extrusion processing were measured, the residual magnetic flux density Br = 590
0G, IHC=3BOOOe.

(BH) max = 6.2 MG Oe T ;h
f), IH compared with the magnetic property values of the Mn-kl-C-Ni alloy produced under the same conditions as the above P-Ni alloy.
C73; 2s96, (BH)maX is 16%
Improved.

Example 2 A cylindrical alloy billet with an outer diameter of 18 mm was created by melting and casting, with the composition of 69.5% Mn, 29.4% A7, 6% Co, and 1% Po, and 0.4% Ni added. did. This billet was held at 1000° C. for about 1 hour, cooled in air, and extruded at a temperature of 700° C. (extrusion ratio 6). When the magnetic property values in the magnetization dominant direction of the Ni-P added alloy after extrusion processing were measured, Br=eoooe, IHC
:3600G, (BH)max=Otsu OMGOs. Mn- produced under the same conditions as the above P-Ni alloy
Compared to the magnetic property values of 41-C-Ni alloy, tHc was improved by 20% and (BH)max was improved by 10%.

Example 3 Mn 7 o, 29f1. Ajt 29.4%, C
004% (7) Composition (Po, 07%, Ni0 for 7J)
．． A cylindrical alloy fillet with an outer diameter of IElljX containing 6% Ti and 0.1% Ti was prepared by melt casting, and the billet was held at 1100'C for about 1 hour and then air cooled. This billet was extruded at a temperature of 700°C (t! extrusion ratio 6).

When the magnetic property values of the alloy in the magnetization dominant direction after extrusion processing were measured, Br: 6050G, summer HC = 3850
G.

(BH) max=7.4MGO6T4 7'c. Above P
-Mn- manufactured under the same conditions as the Ni-T alloy
A/! -C-Ni alloy and Mn-41-C-Ni-Ti
Alloys were compared. For tic, N1-added alloy, Ni
-26% improvement compared to the Ti-added alloy. (BH)
Wax was improved by 30% compared to the N-added alloy and 12% compared to the N-Ti added alloy.

Effects of the Invention The present invention provides Mn-A71! which has improved coercive force and (BH) max than conventional Mn-kl-C alloy magnets. -Q
-P -Ni alloy magnet, and Mn-A 1-C-P
-Ni-Ti based alloy magnet is provided, and this alloy magnet is suitable for speakers, electrical equipment, etc.

[Brief explanation of the drawing]

Figures 1 to 3 show P, Ni, 9 in Mn-Al-C alloy.
IHC, (B
H) It is a diagram showing the relationship with maX. Figure 1 Ni Fluid port f (Tao Figure 2 Figure 4 Figure 3

Claims (1)

[Claims] (11-z7ga 768,0 to 73.0% by weight, charcoal@-7
M n-6,6) to (T"-22,2)% by weight, the balance being aluminum for 100 parts by weight of the alloy, the total amount of phosphorus is 0.6 weight or less, and the amount of nickel is 0.2 to 2.6 weight. A manganese-aluminum-carbon alloy magnet characterized by the addition of 68.0 to 73.0% manganese (9 fJ by weight) and carbon (■Mn-6,6) to (7Mn-22,2) by weight ,
For 100 parts by weight of an alloy with the balance being aluminum, phosphorus is contained in Q6 parts by weight or less, and nickel is contained in amounts of 0.2 to 2.
A manganese-aluminum-carbon alloy magnet characterized by adding 6 parts by weight and 0.01 to 0.5 parts by weight of titanium.