JPH0346439B2 - - Google Patents
Info
- Publication number
- JPH0346439B2 JPH0346439B2 JP57147743A JP14774382A JPH0346439B2 JP H0346439 B2 JPH0346439 B2 JP H0346439B2 JP 57147743 A JP57147743 A JP 57147743A JP 14774382 A JP14774382 A JP 14774382A JP H0346439 B2 JPH0346439 B2 JP H0346439B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- thermal conductivity
- heat
- single crystal
- refrigeration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/16—Oxides
- C30B29/22—Complex oxides
- C30B29/28—Complex oxides with formula A3Me5O12 wherein A is a rare earth metal and Me is Fe, Ga, Sc, Cr, Co or Al, e.g. garnets
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Hard Magnetic Materials (AREA)
Description
【発明の詳細な説明】
［発明の属する技術分野］
この発明は磁気冷凍作業物質の製造方法にかか
わる。DETAILED DESCRIPTION OF THE INVENTION [Technical Field to Which the Invention Pertains] This invention relates to a method for producing magnetically refrigerated materials.
［従来技術とその問題点］
磁性体の磁気熱量効果を利用した磁気冷凍機は
気体冷凍機に比べ単位体積あたりの冷凍能力が高
く、冷凍機の小型化が可能という長所を持つが、
一方、気体冷凍の場合は、気体そのものが冷却さ
れる対象であるのに対し、磁気冷凍の場合は断熱
消磁で冷えた磁性体により冷却対象から吸熱する
過程、および断熱磁化で昇温した磁性体から排熱
する過程の２つの熱交換過程があり、冷凍効率の
向上のためにはこの吸熱・排熱の熱交換過程に要
する時間を最小限に抑える必要がある。従つて、
磁気冷凍作業物質に用いる磁性体は、磁気モーメ
ントが大きいだけでなく、冷凍機の動作温度範囲
で熱伝導率の高いものが望ましい。[Prior art and its problems] Magnetic refrigerators that utilize the magnetocaloric effect of magnetic materials have the advantage of having a higher cooling capacity per unit volume than gas refrigerators and allowing the refrigerator to be made more compact.
On the other hand, in the case of gas refrigeration, the gas itself is the object to be cooled, whereas in the case of magnetic refrigeration, the process of absorbing heat from the object to be cooled by a magnetic material cooled by adiabatic demagnetization, and the magnetic material heated by adiabatic magnetization. There are two heat exchange processes: the process of exhausting heat from the refrigerator, and in order to improve the refrigeration efficiency, it is necessary to minimize the time required for this heat exchange process of heat absorption and exhaust heat. Therefore,
It is desirable that the magnetic material used for the magnetic refrigeration material not only have a large magnetic moment but also a high thermal conductivity within the operating temperature range of the refrigerator.
一般に絶縁体の熱伝導率は温度が下るとともに
増加し、10〜40Kで最大となり、さらに温度が下
がると減少する。このピークより低温側の熱伝導
率は結晶内部の欠陥に依存し、欠陥の数が増えれ
ば熱伝導率が低下する。このため磁性体単結晶塊
体より磁気冷凍作業物質を製造するに際し、いか
にして結晶内部の結晶欠陥を取り除き、熱伝導率
の良い良質の作業物質を得るかが問題である。 Generally, the thermal conductivity of an insulator increases with decreasing temperature, reaches a maximum between 10 and 40 K, and decreases as the temperature decreases further. Thermal conductivity at temperatures lower than this peak depends on the defects inside the crystal, and as the number of defects increases, the thermal conductivity decreases. Therefore, when producing a magnetic refrigeration working material from a magnetic single crystal block, the problem is how to remove crystal defects inside the crystal and obtain a high-quality working material with good thermal conductivity.
［発明の目的］
本発明は、磁気冷凍機に用いる磁気作業物質の
極低温温度領域における熱伝導率の向上を目的と
する。[Object of the Invention] The object of the present invention is to improve the thermal conductivity of a magnetic working material used in a magnetic refrigerator in a cryogenic temperature region.
［発明の概要］
この発明は、磁性体単結晶塊体より磁気冷凍作
業物質を切り出し、加工・整形する際に生ずる結
晶欠陥を熱処理することにより除去し、熱伝導率
の良い磁気冷凍作業物質を製造するものである。[Summary of the Invention] The present invention is to cut out a magnetic refrigerated material from a single crystal block of magnetic material, remove crystal defects that occur during processing and shaping through heat treatment, and create a magnetic refrigerated material with good thermal conductivity. It is manufactured.
［発明の効果］
本発明により極低温温度領域での磁気作業物質
の熱伝導特製を改善できる。[Effects of the Invention] The present invention makes it possible to improve the heat conduction properties of magnetic working materials in the cryogenic temperature range.
［実施例］
図はガドリニウムガリウムガーネツト（GGG）
単結晶塊体より直方体形状に切り出し、表面をラ
ツピング仕上げした試料２と、さらにその試料を
1400℃にて10時間熱処理した後40時間以上かけて
徐々に冷却してできた試料１の熱伝導率の測定結
果の比較である。図にみられるように20K以下で
熱伝導率が向上している。従つて、20K以下で動
作する磁気冷凍機ではGGG単結晶を加工後、ア
ニーリング処理することにより、熱伝導特性のよ
い磁気冷凍作業物質を製造できる。[Example] The figure shows gadolinium gallium garnet (GGG)
Sample 2 was cut into a rectangular parallelepiped shape from a single crystal block, and the surface was finished with wrapping.
This is a comparison of the measurement results of thermal conductivity of Sample 1, which was heat treated at 1400°C for 10 hours and then gradually cooled over 40 hours. As seen in the figure, the thermal conductivity improves below 20K. Therefore, in a magnetic refrigerator that operates at 20K or lower, by processing and annealing the GGG single crystal, it is possible to produce a magnetic refrigeration material with good thermal conductivity.
［その他実施例１］
上記のGGGの熱処理温度は400℃と1400℃の間
に選べる。[Other Examples 1] The heat treatment temperature for the above GGG can be selected between 400°C and 1400°C.
［発明のその他実施例２］
上記のGGG以外にDy3Al5O12（CAG），
Gd3Al5O12（GAG），GdPO4，Dy2Ti2O7等の磁性
体単結晶塊体から切り出し、加工・整形したもの
をアニーリング処理することにより、熱伝導特性
のよい磁気冷凍作業物質を製造できる。[Other embodiment 2 of the invention] In addition to the above GGG, Dy 3 Al 5 O 12 (CAG),
Magnetic refrigeration work with good heat conduction properties is achieved by cutting, processing and shaping a single crystal block of magnetic material such as Gd 3 Al 5 O 12 (GAG), GdPO 4 , Dy 2 Ti 2 O 7 , and annealing it. Substances can be manufactured.
図面は、表面をラツピング仕上げしたGGGと、
さらにその試料を1400℃にて10時間熱処理した試
料の熱伝導率の測定結果の特性図である。
The drawing shows GGG with wrapping finish on the surface,
It is a characteristic diagram of the measurement result of the thermal conductivity of the sample which was further heat-treated at 1400°C for 10 hours.
Claims (1)
り出し加工・整形した後、アニーリングにより結
晶内部の格子欠陥を除去することを特徴とする磁
気冷凍作業物質の製造方法。1. A method for producing a magnetic refrigeration material, which comprises cutting out the magnetic refrigeration material from a magnetic single crystal block, processing and shaping the material, and then removing lattice defects inside the crystal by annealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57147743A JPS5939799A (en) | 1982-08-27 | 1982-08-27 | Production of operating material for magnetic refrigeration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57147743A JPS5939799A (en) | 1982-08-27 | 1982-08-27 | Production of operating material for magnetic refrigeration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5939799A JPS5939799A (en) | 1984-03-05 |
| JPH0346439B2 true JPH0346439B2 (en) | 1991-07-16 |
Family
ID=15437135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57147743A Granted JPS5939799A (en) | 1982-08-27 | 1982-08-27 | Production of operating material for magnetic refrigeration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5939799A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116972547A (en) * | 2022-04-24 | 2023-10-31 | 中国科学院金属研究所 | Application of rare earth fluoride monocrystal in magnetic refrigeration |
-
1982
- 1982-08-27 JP JP57147743A patent/JPS5939799A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5939799A (en) | 1984-03-05 |
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