JP3292893B2 - Microwave absorption heating element - Google Patents
Microwave absorption heating elementInfo
- Publication number
- JP3292893B2 JP3292893B2 JP34816592A JP34816592A JP3292893B2 JP 3292893 B2 JP3292893 B2 JP 3292893B2 JP 34816592 A JP34816592 A JP 34816592A JP 34816592 A JP34816592 A JP 34816592A JP 3292893 B2 JP3292893 B2 JP 3292893B2
- Authority
- JP
- Japan
- Prior art keywords
- microwave
- heating element
- present
- mixture
- zinc oxide
- 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 - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Constitution Of High-Frequency Heating (AREA)
- Electric Ovens (AREA)
- Compounds Of Iron (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、マイクロ波吸収発熱体
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave absorbing heating element.
【０００２】[0002]
【従来技術とその課題】フェライトがマイクロ波を吸収
してマイクロ波エネルギーを熱エネルギーに変換するこ
とはよく知られており、フェライトがマイクロ波加熱装
置（電子レンジ）のマイクロ波吸収発熱体として広く利
用されている。しかしながら、フェライトはマイクロ波
帯においては充分な吸収量を得ることができず、そのた
めマイクロ波吸収発熱体として充分な発熱量が得られな
いという欠点を有している。2. Description of the Related Art It is well known that ferrite absorbs microwaves and converts microwave energy into heat energy. Ferrite is widely used as a microwave-absorbing heating element in microwave heating devices (microwave ovens). It's being used. However, ferrite has a drawback in that a sufficient amount of absorption cannot be obtained in a microwave band, and thus a sufficient amount of heat generation cannot be obtained as a microwave absorption heating element.
【０００３】このような欠点を解消するためにフェライ
トにカーボン粉末や炭化珪素粉末を配合した複合フェラ
イトも開発されている（特公昭５１−１６６６２号公
報、特開平１−１６３９９４号公報等参照）が、耐熱衝
撃性に劣るという欠点を有している。In order to solve such disadvantages, a composite ferrite in which carbon powder or silicon carbide powder is blended with ferrite has also been developed (see Japanese Patent Publication No. 51-16662 and Japanese Patent Application Laid-Open No. 1-163994). And has a drawback of poor thermal shock resistance.
【０００４】また、近年酸化亜鉛ウィスカーを発熱剤と
して用いたマイクロ波吸収発熱体が開発されている（特
開平２−２１６７８９号公報参照）。しかしながら、こ
のマイクロ波吸収発熱体には、マイクロ波エネルギーの
変換効率が低いという欠点がある。In recent years, a microwave-absorbing heating element using zinc oxide whiskers as a heating agent has been developed (see JP-A-2-216789). However, this microwave absorption heating element has a drawback that the microwave energy conversion efficiency is low.
【０００５】[0005]
【課題を解決するための手段】本発明者らは、上記欠点
を有しないマイクロ波吸収発熱体を開発すべく鋭意研究
を重ねるうち、ついに本発明を完成するに至った。Means for Solving the Problems The inventors of the present invention have made intensive studies to develop a microwave absorbing heating element which does not have the above-mentioned disadvantages, and have finally completed the present invention.
【０００６】即ち、本発明は、酸化鉄と酸化亜鉛との混
合物に有機高分子化合物を加え、圧縮成形した後に焼結
してなるマイクロ波吸収発熱体に係る。That is, the present invention relates to a microwave-absorbing heating element obtained by adding an organic polymer compound to a mixture of iron oxide and zinc oxide, compression-molding and then sintering.
【０００７】本発明で用いられる酸化鉄としては、例え
ばＦｅＯ、Ｆｅ2 Ｏ3 、Ｆｅ3 Ｏ4等、好ましくはＦｅ
2 Ｏ3 等が挙げられ、その粒径は特に限定されるもので
はない。The iron oxide used in the present invention includes, for example, FeO, Fe 2 O 3 , Fe 3 O 4, etc.
2 O 3 and the like, and the particle size is not particularly limited.
【０００８】本発明で用いられる酸化亜鉛としても、そ
の粒径は特に限定されるものではなく、また形状も特に
限定されず粒子状、粉状、ウィスカー状等いずれであっ
てもよい。The particle size of the zinc oxide used in the present invention is not particularly limited, and the shape is not particularly limited, and may be any of a particle shape, a powder shape, a whisker shape, and the like.
【０００９】本発明において、酸化鉄と酸化亜鉛との混
合割合としては、特に限定されるものではないが、両者
の混合比が２：９８〜９５：５とするのが好ましく、１
０：９０〜９０：１０とするのが特に好ましい。酸化鉄
の混合割合が少なくなると、マイクロ波吸収効率が低下
するという欠点が生ずる傾向となり、一方逆に酸化鉄の
配合割合が多くなると、焼結時にクラックが発生し易く
なるという傾向が生ずる傾向となり、いずれも好ましく
ない。In the present invention, the mixing ratio of iron oxide and zinc oxide is not particularly limited, but the mixing ratio of the two is preferably from 2:98 to 95: 5, and preferably 1:98 to 95: 5.
The ratio is particularly preferably from 0:90 to 90:10. When the mixing ratio of iron oxide decreases, the disadvantage that microwave absorption efficiency decreases tends to occur.On the other hand, when the mixing ratio of iron oxide increases, cracks tend to occur during sintering. Are not preferred.
【００１０】本発明で用いられる有機高分子化合物とし
ては、従来公知のものを広く使用でき、例えばポリエチ
レン、ポリプロピレン、ポリ塩化ビニル、ポリビニルア
ルコール、ＡＢＳ、ポリアミド、アクリル樹脂等の熱可
塑性樹脂、天然ゴム、ポリクロロプレン、ブタジエンゴ
ム、弗素ゴム、アクリルゴム等のゴム類、フェノール樹
脂、不飽和ポリエステル樹脂、エポキシ樹脂、シリコー
ン樹脂等の熱硬化性樹脂等を挙げることができる。これ
ら有機高分子化合物の中でも、水溶性のポリビニルアル
コールやアクリル樹脂が特に好適である。斯かる有機高
分子化合物の添加量としては、特に限定されないが、酸
化鉄と酸化亜鉛との合計量に対して通常１〜４０重量％
程度、好ましくは２〜１０重量％程度とするのがよい。
有機高分子化合物の添加量が少な過ぎると、焼結時の成
形性が悪くなるという傾向が生ずる傾向となり、逆に有
機高分子化合物の添加量が多過ぎると、焼結体の密度が
上がらないという傾向が生ずる傾向となる。As the organic polymer compound used in the present invention, conventionally known compounds can be widely used, for example, thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, polyvinyl alcohol, ABS, polyamide and acrylic resin, and natural rubber. And rubbers such as polychloroprene, butadiene rubber, fluorine rubber, and acrylic rubber; and thermosetting resins such as phenolic resins, unsaturated polyester resins, epoxy resins, and silicone resins. Among these organic polymer compounds, water-soluble polyvinyl alcohol and acrylic resin are particularly preferable. The amount of the organic polymer compound is not particularly limited, but is usually 1 to 40% by weight based on the total amount of iron oxide and zinc oxide.
And preferably about 2 to 10% by weight.
If the amount of the organic polymer compound is too small, the moldability at the time of sintering tends to deteriorate, and if the amount of the organic polymer compound is too large, the density of the sintered body does not increase. This tends to occur.
【００１１】本発明のマイクロ波吸収発熱体は、酸化鉄
と酸化亜鉛との混合物に有機高分子化合物を加え、圧縮
成形した後に焼結することにより得られる。有機高分子
化合物を添加するに先立って、酸化鉄と酸化亜鉛との混
合物を予め仮焼しておいてもよい。圧縮成形及び焼結
は、常法に従って行ない得る。例えば圧縮成形時の成形
圧力は、通常２００ｋｇ／ｃｍ2 以上とするのがよく、
また焼結は８００〜１３５０℃程度、好ましくは１００
０〜１３５０℃程度で行なうのがよい。The microwave absorbing heat generating element of the present invention is obtained by adding an organic polymer compound to a mixture of iron oxide and zinc oxide, compression-molding, and then sintering. Prior to adding the organic polymer compound, a mixture of iron oxide and zinc oxide may be calcined in advance. Compression molding and sintering can be performed according to conventional methods. For example, the molding pressure during compression molding is usually preferably 200 kg / cm 2 or more,
Sintering is performed at about 800 to 1350 ° C., preferably 100 ° C.
It is preferable to carry out at about 0 to 1350 ° C.
【００１２】[0012]
【実施例】以下に実施例を掲げて本発明をより一層明ら
かにする。The present invention will be further clarified with reference to the following examples.
【００１３】実施例１ Ｆｅ2 Ｏ3 （試薬特級）３０．０ｇ及びＺｎＯ（試薬特
級）２７０．０ｇを自動混合機を用いて混合した後、ポ
リビニルアルコール水溶液（試薬特級、固形物換算１
５．８ｇ）を加え、更に混合した。この混合物を５００
ｋｇ／ｃｍ2 の圧力で成形し、この成形体を大気中で図
１に示す温度スケジュールで焼結し、本発明のマイクロ
波吸収発熱体を得た。Example 1 After 30.0 g of Fe 2 O 3 (special grade of reagent) and 270.0 g of ZnO (special grade of reagent) were mixed by using an automatic mixer, an aqueous polyvinyl alcohol solution (special grade of solid reagent, 1
5.8 g) was added and further mixed. This mixture is
The molded body was molded at a pressure of kg / cm 2 , and the molded body was sintered in the air at a temperature schedule shown in FIG. 1 to obtain a microwave absorbing heating element of the present invention.
【００１４】実施例２ Ｆｅ2 Ｏ3 （試薬特級）６０．０ｇ及びＺｎＯ（試薬特
級）２４０．０ｇを自動混合機を用いて混合した後、ポ
リビニルアルコール水溶液（試薬特級、固形物換算１
５．８ｇ）を加え、更に混合した。以下実施例１と同様
にして、本発明のマイクロ波吸収発熱体を得た。Example 2 60.0 g of Fe 2 O 3 (special grade of reagent) and 240.0 g of ZnO (special grade of reagent) were mixed using an automatic mixer, and then an aqueous solution of polyvinyl alcohol (special grade of solid reagent, 1
5.8 g) was added and further mixed. Thereafter, in the same manner as in Example 1, a microwave absorption heating element of the present invention was obtained.
【００１５】実施例３ Ｆｅ2 Ｏ3 （試薬特級）９０．０ｇ及びＺｎＯ（試薬特
級）２１０．０ｇを自動混合機を用いて混合した後に、
この混合物を１２００℃で１時間大気中で仮焼し、粉砕
した。この仮焼生成物にポリビニルアルコール水溶液
（試薬特級、固形物換算１５．８ｇ）を加え、更に混合
した。この混合物を２０００ｋｇ／ｃｍ2の圧力で成形
し、この成形体を大気中で図１に示す温度スケジュール
で焼結し、本発明のマイクロ波吸収発熱体を得た。Example 3 After 90.0 g of Fe 2 O 3 (special grade reagent) and 210.0 g of ZnO (special grade reagent) were mixed using an automatic mixer,
This mixture was calcined in the air at 1200 ° C. for 1 hour and pulverized. To this calcined product, an aqueous polyvinyl alcohol solution (special reagent grade, 15.8 g in terms of solids) was added and further mixed. This mixture was molded at a pressure of 2000 kg / cm 2 , and the molded body was sintered in the air at a temperature schedule shown in FIG. 1 to obtain a microwave absorbing heat generating body of the present invention.
【００１６】実施例４ Ｆｅ2 Ｏ3 とＺｎＯとの混合割合を８０：２０（重量
比）とする以外は、実施例１と同様にして、本発明のマ
イクロ波吸収発熱体を得た。Example 4 A microwave absorbing heating element of the present invention was obtained in the same manner as in Example 1 except that the mixing ratio of Fe 2 O 3 and ZnO was changed to 80:20 (weight ratio).
【００１７】実施例５ Ｆｅ2 Ｏ3 とＺｎＯとの混合割合を９０：１０（重量
比）とする以外は、実施例１と同様にして、本発明のマ
イクロ波吸収発熱体を得た。Example 5 A microwave absorbing heating element of the present invention was obtained in the same manner as in Example 1 except that the mixing ratio of Fe 2 O 3 and ZnO was 90:10 (weight ratio).
【００１８】上記実施例１〜５で得られた各マイクロ波
吸収発熱体の焼結密度を測定した。また、各マイクロ波
吸収発熱体を電子レンジ〔定格発振周期数２４５０ＭＨ
ｚ、日立ホームテック（株）製〕内に入れ、放射温度計
〔ＩＲ−３０８、中温域，ガラス越し用、ミノルタ
（株）製〕を用いて発熱温度を測定した。更に各マイク
ロ波吸収発熱体の亀裂状態も調べた。これらの結果を表
１に示す。The sintered density of each of the microwave-absorbing heating elements obtained in Examples 1 to 5 was measured. In addition, each microwave absorbing and heating element is placed in a microwave oven [rated oscillation cycle number of 2450 MHz.
z, manufactured by Hitachi Hometech Co., Ltd.], and the exothermic temperature was measured using a radiation thermometer [IR-308, medium temperature range, through glass, manufactured by Minolta Co., Ltd.]. Further, the crack state of each microwave absorbing heat generating element was also examined. Table 1 shows the results.
【００１９】[0019]
【表１】 [Table 1]
【００２０】比較例１ バリウムフェライトとチタン酸バリウムとを重量比で７
５：２５となるように秤量、混合し、更にポリビニルア
ルコールバインダーを添加し、混合した。この混合物を
５００ｋｇ／ｃｍ2 の圧力で直径２０ｍｍのペレットに
成形した後、更に２０００ｋｇ／ｃｍ2 の圧力でＣＩＰ
成形した。その成形体を６００℃まで徐々に加熱し、２
時間保持し、バインダーを除去した後、１３００℃で２
時間焼結した。この焼結体は変形した。またバインダー
除去の段階をなくし、急激に加熱した場合にはクラック
が発生した。Comparative Example 1 Barium ferrite and barium titanate in a weight ratio of 7
The mixture was weighed and mixed at 5:25, and a polyvinyl alcohol binder was further added and mixed. This mixture was formed into pellets having a diameter of 20 mm at a pressure of 500 kg / cm 2 and then CIP was further formed at a pressure of 2000 kg / cm 2.
Molded. The molded body is gradually heated to 600 ° C.
After holding for a time and removing the binder,
Sintered for hours. This sintered body was deformed. In addition, when the step of removing the binder was omitted and heating was performed rapidly, cracks occurred.
【００２１】比較例２ バリウムフェライトと酸化亜鉛とを重量比で７０：３０
となるように秤量、混合し、更にポリビニルアルコール
バインダーを添加し、混合した。この混合物を３００ｋ
ｇ／ｃｍ2 の圧力で成形した。その成形体を３００℃／
時で昇温し、１２００℃で２時間焼結した。焼結体は、
電子レンジ中で約１分間で９００℃以上に発熱し、激し
い亀裂の発生は生じなかった。バリウムフェライト／チ
タン酸バリウム系に比べると、この系は優れた耐熱衝撃
性を示したが、反応により生成するＢａＯが材料の化学
的安定性に悪影響を及ぼした。即ちＢａＯは水を吸い易
く、またＣＯ2 とも反応し易く、変質し易かった。Comparative Example 2 Barium ferrite and zinc oxide were mixed in a weight ratio of 70:30.
Were weighed and mixed so as to obtain, and a polyvinyl alcohol binder was further added and mixed. 300k of this mixture
It was molded at a pressure of g / cm 2 . 300 ° C /
Then, the temperature was raised, and sintering was performed at 1200 ° C. for 2 hours. The sintered body is
Heat was generated to 900 ° C. or more in a microwave oven for about 1 minute, and no severe cracking occurred. Compared to the barium ferrite / barium titanate system, this system exhibited excellent thermal shock resistance, but the BaO formed by the reaction adversely affected the chemical stability of the material. That is, BaO was easy to absorb water, easily reacted with CO 2, and easily deteriorated.
【００２２】[0022]
【発明の効果】本発明のマイクロ波吸収発熱体は、安定
した発熱性及び良好な耐熱衝撃性を有し、しかもマイク
ロ波エネルギーの変換効率に高いものである。The microwave-absorbing heating element of the present invention has stable heat generation and good thermal shock resistance, and has a high microwave energy conversion efficiency.
【図１】成形体を焼結する際の温度スケジュールを示す
グラフである。FIG. 1 is a graph showing a temperature schedule for sintering a compact.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−216789（ＪＰ，Ａ) 特開 平４−137482（ＪＰ，Ａ) 特開 昭50−8126（ＪＰ，Ａ) 特開 平２−217719（ＪＰ，Ａ) 特開 平３−25888（ＪＰ，Ａ) 特開 平１−166723（ＪＰ，Ａ) 特開 昭63−108122（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H05B 6/74 C01G 49/00 C04B 35/453 F24C 7/02 561 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-216789 (JP, A) JP-A-4-137482 (JP, A) JP-A-50-8126 (JP, A) JP-A-2-8 217719 (JP, A) JP-A-3-25888 (JP, A) JP-A-1-166723 (JP, A) JP-A-63-108122 (JP, A) (58) Fields investigated (Int. 7 , DB name) H05B 6/74 C01G 49/00 C04B 35/453 F24C 7/02 561
Claims (2)
子化合物を加え、圧縮成形した後に焼結してなるマイク
ロ波吸収発熱体。1. A microwave-absorbing heating element obtained by adding an organic polymer compound to a mixture of iron oxide and zinc oxide, compression molding and sintering.
から９５：５である請求項１記載のマイクロ波吸収発熱
体。2. The mixing ratio of iron oxide and zinc oxide is 2:98.
2. The microwave-absorbing heating element according to claim 1, wherein the ratio is from 95 to 95: 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34816592A JP3292893B2 (en) | 1992-12-28 | 1992-12-28 | Microwave absorption heating element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34816592A JP3292893B2 (en) | 1992-12-28 | 1992-12-28 | Microwave absorption heating element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06203950A JPH06203950A (en) | 1994-07-22 |
| JP3292893B2 true JP3292893B2 (en) | 2002-06-17 |
Family
ID=18395191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34816592A Expired - Fee Related JP3292893B2 (en) | 1992-12-28 | 1992-12-28 | Microwave absorption heating element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3292893B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101314384B1 (en) * | 2011-04-07 | 2013-10-04 | 서덕동 | Metal oxide composition heated by microwave irradiation, organic/inorganic composition and product comprising the same |
| CN108285261B (en) * | 2018-03-20 | 2024-02-06 | 中国石油大学(北京) | Device for treating oily sludge by microwaves and treatment method thereof |
| CN108439766B (en) * | 2018-03-20 | 2024-01-23 | 中国石油大学(北京) | Method for treating oily sludge |
| CN108409106B (en) * | 2018-03-20 | 2024-05-07 | 中国石油大学(北京) | Microwave treatment method and equipment for oily sludge |
-
1992
- 1992-12-28 JP JP34816592A patent/JP3292893B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06203950A (en) | 1994-07-22 |
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