JPH1192230A - Composite sintered product from boron nitride and spinel - Google Patents
Composite sintered product from boron nitride and spinelInfo
- Publication number
- JPH1192230A JPH1192230A JP9253075A JP25307597A JPH1192230A JP H1192230 A JPH1192230 A JP H1192230A JP 9253075 A JP9253075 A JP 9253075A JP 25307597 A JP25307597 A JP 25307597A JP H1192230 A JPH1192230 A JP H1192230A
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- JP
- Japan
- Prior art keywords
- spinel
- composite sintered
- boron nitride
- sintered body
- mgo
- 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.)
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Links
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- Ceramic Products (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば溶鋼等の溶
融金属の処理に用いる耐熱衝撃性、耐溶損性に優れた窒
化硼素とスピネルの複合焼結体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite sintered body of boron nitride and spinel having excellent thermal shock resistance and erosion resistance used for treating molten metal such as molten steel.
【０００２】[0002]
【従来の技術】従来、溶融金属の処理に用いる治具、例
えば測温用の保護管、ノズル、ブレークリング等におい
て、耐熱衝撃性や溶融金属に対する化学的安定性が要求
される場合に、窒化硼素（ＢＮ）材、窒化硼素／窒化珪
素（ＢＮ／Ｓｉ3 Ｎ4 ）系複合材、窒化硼素／窒化アル
ミニウム／アルミナ（ＢＮ／ＡｌＮ／Ａｌ2 Ｏ3 ）系複
合材等が使用されている。2. Description of the Related Art Conventionally, in a jig used for treating molten metal, for example, a protective tube for temperature measurement, a nozzle, a break ring, etc., when heat shock resistance and chemical stability to molten metal are required, nitriding is performed. A boron (BN) material, a boron nitride / silicon nitride (BN / Si 3 N 4 ) -based composite material, a boron nitride / aluminum nitride / alumina (BN / AlN / Al 2 O 3 ) -based composite material, and the like are used.
【０００３】しかしながら、このような窒化硼素系材料
は、１０００℃以上の温度下で溶融金属と接触すると、
溶融金属やスラグ成分との長時間の化学的反応による溶
損に加えて、溶融金属の対流による激しい摩耗作用を受
けて組織強度の弱いＢＮは欠落してしまい、充分な耐溶
損性が得られないという問題があった。However, when such a boron nitride-based material comes in contact with a molten metal at a temperature of 1000 ° C. or more,
In addition to erosion due to long-term chemical reaction with molten metal and slag components, BN with weak tissue strength is lost due to severe wear caused by convection of the molten metal, and sufficient erosion resistance is obtained. There was no problem.
【０００４】そこで、耐溶損性の向上を図るため、ＢＮ
／Ｓｉ3 Ｎ4 ／ＡｌＮ／Ａｌ2 Ｏ3系複合焼結体（特開
昭６０−９６５７５号公報）、ＢＮ／ＡｌＮ／ＭｇＯ系
複合焼結体（特開平７−２７７８３０号公報）、更には
ＢＮ／Ｓｉ3 Ｎ4 系複合材料又はＢＮ／サイアロン系複
合材料に、アルミナ（Ａｌ2 Ｏ3 ）、ジルコニア（Ｚｒ
Ｏ2 ）、ＭｇＯ（マグネシア）、スピネル（ＭｇＡｌ2
Ｏ4 ）のうちから選ばれる１種以上の物質を焼結させた
表面層で被覆したＢＮ系複合材料（特開平４−２８０８
８７号公報）等が提案されている。Therefore, in order to improve the erosion resistance, BN
/ Si 3 N 4 / AlN / Al 2 O 3 -based composite sintered body (JP-A-60-96575), BN / AlN / MgO-based composite sintered body (JP-A-7-277830), and Alumina (Al 2 O 3 ), zirconia (Zr) are added to a BN / Si 3 N 4 composite material or a BN / Sialon composite material.
O 2 ), MgO (magnesia), spinel (MgAl 2
BN-based composite material coated with a surface layer obtained by sintering at least one substance selected from O 4 ) (Japanese Patent Laid-Open No. 4-2808).
87 has been proposed.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前２者
の複合焼結体では、溶融金属に浸漬した際に焼結体表面
に存在するＢＮが欠落し、耐溶損性の改善効果が充分で
ない。後者の複合材料では、長時間の浸漬において表面
層が基材から剥離しやすくなり、特に熱衝撃が加わる状
況などでは、耐溶損性が不足する問題がある。そこで、
耐熱衝撃性に優れ、長時間の浸漬においても溶損が非常
に少ない材料の提供が待たれていた。However, in the former two composite sintered bodies, BN existing on the surface of the sintered body when immersed in a molten metal is missing, and the effect of improving erosion resistance is not sufficient. In the latter composite material, there is a problem that the surface layer is easily peeled off from the base material during long-term immersion, and the erosion resistance is insufficient particularly in a situation where a thermal shock is applied. Therefore,
It has been desired to provide a material having excellent thermal shock resistance and having very little erosion even after long-term immersion.
【０００６】上記目的を達成するために、本発明者らは
鋭意検討した結果、以下のことを見いだし、本発明を完
成させたものである。 （ａ）ＢＮとスピネル（ＭｇＡｌ2 Ｏ4 ）を適量含む焼
結体は、耐熱衝撃性と耐溶損性のバランスに優れた材料
となる。 （ｂ）特に、耐熱衝撃性、耐溶損性は、ＢＮとスピネル
の各々の粒子又は粒子塊の平均の大きさが１００μｍ以
下のときに優れる。ここで、「粒子又は粒子塊」とは、
ＢＮ／スピネル複合焼結体においては、ＢＮ又はスピネ
ルのそれぞれの単一粒子又はその単一粒子が偏析した多
粒子の塊を意味し、その焼結原料である混合粉末におい
ては、それぞれの一次粒子とその凝集塊のことである。 （ｃ）ＢＮとスピネル（ＭｇＡｌ2 Ｏ4 ）を適量含む上
記複合焼結体を、溶融金属等に浸漬した際に、その表面
にＭｇＯ・Ａｌ2 Ｏ3 スピネルを主成分とする密着性の
極めて高い被膜が形成され、耐溶損性が一段と優れたも
のとなる。The present inventors have conducted intensive studies to achieve the above object, and as a result, have found the following and completed the present invention. (A) A sintered body containing an appropriate amount of BN and spinel (MgAl 2 O 4 ) is a material having an excellent balance between thermal shock resistance and erosion resistance. (B) In particular, thermal shock resistance and erosion resistance are excellent when the average size of each particle or particle mass of BN and spinel is 100 μm or less. Here, “particles or particle mass”
In the BN / spinel composite sintered body, it means a single particle of BN or spinel or a mass of multi-particles in which the single particle is segregated. And its agglomerates. (C) When the above-mentioned composite sintered body containing an appropriate amount of BN and spinel (MgAl 2 O 4 ) is immersed in a molten metal or the like, the surface of the composite sintered body has an extremely close adhesion mainly composed of MgO · Al 2 O 3 spinel. A high coating is formed, and the erosion resistance is further improved.
【０００７】[0007]
【課題を解決するための手段】すなわち、本発明は、六
方晶窒化硼素１０〜９０重量％と、ＭｇＯ・Ａｌ2 Ｏ 3
スピネル９０〜１０重量％とからなる窒化硼素とスピネ
ルの複合焼結体である。また、本発明は、六方晶窒化硼
素とＭｇＯ・Ａｌ2 Ｏ3 スピネルの複合焼結体の表面
に、ＭｇＯ・Ａｌ2 Ｏ3 スピネル質を主成分とする被膜
が形成されてなることを特徴とする窒化硼素とスピネル
の複合焼結体である。That is, the present invention provides six
10 to 90% by weight of cubic boron nitride and MgO.AlTwo O Three
Boron nitride comprising 90 to 10% by weight of spinel and spine
This is a composite sintered body of The present invention also provides a hexagonal boron nitride.
Element and MgO / AlTwo OThreeSurface of composite sintered body of spinel
And MgO / AlTwo OThreeSpinel-based coating
Boron nitride and spinel, characterized by the formation of
Is a composite sintered body.
【０００８】[0008]
【発明の実施の形態】以下、更に詳しく本発明を説明す
る。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.
【０００９】本発明のＢＮ／スピネル複合焼結体は、六
方晶窒化硼素１０〜９０重量％と、ＭｇＯ・Ａｌ2 Ｏ3
スピネル９０〜１０重量％とからなるものである。六方
晶窒化硼素が１０重量％未満では、耐熱衝撃性と機械加
工性が低下し、また９０重量％を超えると耐溶損性が低
下する。特に好ましい六方晶窒化硼素の割合は、２０〜
８０重量％である。一方、スピネルが９０重量％を超え
ると、耐熱衝撃性と機械加工性が低下し、また１０重量
％未満では、耐溶損性が低下する。特に好ましいスピネ
ルの割合は、８０〜２０重量％である。The BN / spinel composite sintered body of the present invention comprises 10 to 90% by weight of hexagonal boron nitride and MgO.Al 2 O 3
Spinel 90 to 10% by weight. When the content of hexagonal boron nitride is less than 10% by weight, the thermal shock resistance and machinability are reduced, and when it exceeds 90% by weight, the erosion resistance is reduced. A particularly preferred ratio of hexagonal boron nitride is 20 to
80% by weight. On the other hand, when the spinel content exceeds 90% by weight, the thermal shock resistance and machinability decrease, and when it is less than 10% by weight, the erosion resistance decreases. A particularly preferred ratio of spinel is 80 to 20% by weight.
【００１０】本発明のＢＮ／スピネル複合焼結体には、
その製造上、原料粉末等から不可避的に混入する、Ｓｉ
Ｏ2 、ＣａＯ、ＭｇＯ、Ｆｅ2 Ｏ3 、Ａｌ2 Ｏ3 、Ｎａ
2 Ｏ、ＡｌＮ、Ｓｉ3 Ｎ4 、ＺｒＢ2 、ＺｒＯ2 、Ｓｉ
Ｃ等が含まれていても差し支えない。これらの割合は、
少ないほど好ましいが、合計で１０重量％まで許容でき
る。とくに、ＡｌＮ、Ｓｉ3 Ｎ4 の混入は、それらがス
ピネルのＡｌ2 Ｏ3 分と反応してＡｌＯＮ、ＳｉＡｌＯ
Ｎ等の酸窒化物を生成し、耐溶損性を低下させるので注
意が必要である。[0010] The BN / spinel composite sintered body of the present invention includes:
Due to its production, Si which is inevitably mixed
O 2 , CaO, MgO, Fe 2 O 3 , Al 2 O 3 , Na
2 O, AlN, Si 3 N 4 , ZrB 2 , ZrO 2 , Si
C or the like may be contained. These percentages are
A smaller amount is preferred, but a total of up to 10% by weight is acceptable. In particular, AlN and Si 3 N 4 are mixed when they react with Al 2 O 3 of the spinel to form AlON, SiAlO.
Care must be taken because oxynitrides such as N are generated and the erosion resistance is reduced.
【００１１】本発明のＢＮ／スピネル複合焼結体を構成
する粒子又は粒子塊の平均の大きさは、ＢＮ、スピネル
共に１００μｍ以下であることが好ましい。ＢＮの粒子
又は粒子塊の平均の大きさが１００μｍを超えると耐摩
耗性が低下し、スピネルの粒子又は粒子塊の平均の大き
さが１００μｍを超えると耐溶損性が低下する。特に好
ましいＢＮ及びスピネルの粒子又は粒子塊の平均の大き
さは５０μｍ以下である。It is preferable that the average size of the particles or particle aggregates constituting the BN / spinel composite sintered body of the present invention is 100 μm or less for both BN and spinel. If the average size of the BN particles or particle mass exceeds 100 μm, the abrasion resistance decreases, and if the average size of the spinel particles or the particle mass exceeds 100 μm, the erosion resistance decreases. Particularly preferred average size of BN and spinel particles or particle mass is 50 μm or less.
【００１２】本発明のＢＮ／スピネル複合焼結体は、六
方晶窒化硼素粉末、ＭｇＯ粉末及びＡｌ2 Ｏ3 粉末の混
合粉末、又は六方晶窒化硼素粉末とスピネル粉末の混合
粉末を原料とし、常圧焼結法又は加圧焼結（ホットプレ
ス、ＨＩＰ等）によって製造することができる。[0012] The BN / spinel composite sintered body of the present invention is prepared from a mixed powder of hexagonal boron nitride powder, MgO powder and Al 2 O 3 powder or a mixed powder of hexagonal boron nitride powder and spinel powder. It can be manufactured by a pressure sintering method or a pressure sintering (hot press, HIP, etc.).
【００１３】六方晶窒化硼素粉末原料の酸素量は１〜４
重量％程度が好ましい。スピネル成分は、ＭｇＯ粉末と
Ａｌ2 Ｏ3 粉末を重量比２：３〜１：９の範囲で個別に
添加しても良いし、スピネル粉末を用いても良い。各々
の粒子又は粒子塊の平均の大きさについては、９０μｍ
以下、特に５０μｍ以下が好ましい。原料粉末の混合
は、ボールミル、振動ミル、ミキサー等の混合機を用い
て行われる。The oxygen content of the hexagonal boron nitride powder raw material is 1 to 4
% By weight is preferred. As the spinel component, MgO powder and Al 2 O 3 powder may be individually added in a weight ratio of 2: 3 to 1: 9, or spinel powder may be used. 90 μm for the average size of each particle or particle mass
The thickness is particularly preferably 50 μm or less. The mixing of the raw material powders is performed using a mixer such as a ball mill, a vibration mill, and a mixer.
【００１４】常圧焼結の場合、金型若しくはＣＩＰを用
い成形圧０．１〜５ｔｏｎ／ｃｍ2で成形後、温度１５
００〜２０００℃、窒素、アルゴン等の不活性雰囲気中
で行えばよい。ホットプレスの場合、温度１５００〜２
０００℃、圧力５０〜１５０ｋｇ／ｃｍ2 の条件で行
う。In the case of normal pressure sintering, after molding using a mold or CIP at a molding pressure of 0.1 to 5 ton / cm 2 ,
It may be performed at 00 to 2000 ° C. in an inert atmosphere such as nitrogen or argon. In case of hot press, temperature 1500-2
It is performed under the conditions of 000 ° C. and pressure of 50 to 150 kg / cm 2 .
【００１５】以上によって製造された本発明のＢＮ／ス
ピネル複合焼結体は、従来のＢＮ／Ｓｉ3 Ｎ4 系複合焼
結体やＢＮ／ＡｌＮ／Ａｌ2 Ｏ3 系複合焼結体と比較し
て、耐溶損性に優れたものとなる。The BN / spinel composite sintered body of the present invention produced as described above is compared with a conventional BN / Si 3 N 4 composite sintered body or a BN / AlN / Al 2 O 3 composite sintered body. Therefore, it is excellent in erosion resistance.
【００１６】次の本発明は、六方晶窒化硼素とＭｇＯ・
Ａｌ2 Ｏ3 スピネルの複合焼結体の表面に、ＭｇＯ・Ａ
ｌ2 Ｏ3 スピネル質を主成分とする被膜を形成させたも
のである。このような構造とすることによって、耐溶損
性が一段と高まったものとなる。Next, the present invention relates to hexagonal boron nitride and MgO.
On the surface of the composite sintered body of Al 2 O 3 spinel, MgO
It is formed by forming a coating mainly composed of l 2 O 3 spinel. With such a structure, the erosion resistance is further improved.
【００１７】本発明のコア部を構成する、六方晶窒化硼
素とＭｇＯ・Ａｌ2 Ｏ3 スピネルの複合焼結体は、上記
した本発明のＢＮ／スピネル複合焼結体が適用され、そ
の表面に形成させる被膜は、ＭｇＯ・Ａｌ2 Ｏ3 スピネ
ル質を主成分とするものである。被膜の厚みとしては、
数〜数百μｍである。なお、コア部及び被膜には、上記
した不可避不純物の混入は許容できる。The BN / spinel composite sintered body of the present invention is applied to the composite sintered body of hexagonal boron nitride and MgO.Al 2 O 3 spinel constituting the core of the present invention. The coating to be formed is composed mainly of MgO.Al 2 O 3 spinel. As the thickness of the coating,
It is several to several hundred μm. Note that the inevitable impurities described above can be allowed to enter the core and the coating.
【００１８】本発明のように、被膜がＭｇＯ・Ａｌ2 Ｏ
3 スピネル質であり、コア部がＢＮ／スピネル複合焼結
体であるものは、上記した本発明のＢＮ／スピネル複合
焼結体を溶融金属中に浸漬させることによって製造する
ことができる。このように、上記した本発明のＢＮ／ス
ピネル複合焼結体は、本発明のＭｇＯ・Ａｌ2 Ｏ3 スピ
ネル質被覆型複合焼結体の製造原料としても使用でき
る。As in the present invention, the coating is made of MgO.Al 2 O
(3) A BN / spinel composite sintered body having a core of a BN / spinel composite sintered body can be manufactured by immersing the above-described BN / spinel composite sintered body in a molten metal. Thus, the above-described BN / spinel composite sintered body of the present invention can be used as a raw material for producing the MgO.Al 2 O 3 spinel-coated composite sintered body of the present invention.
【００１９】本発明におけるＭｇＯ・Ａｌ2 Ｏ3 スピネ
ル質被膜は、一般的に多孔質であること、スピネル同士
が連続的に粒接合していること、コア部のスピネル粒子
に比べて緻密化していること、コア部の界面では被膜と
コア部のスピネル同士がこれまた粒接合していて密着性
が大であること、これらの理由から熱衝撃が加わったり
溶融金属中に長時間浸漬されても、良好な耐溶損性を示
すこと、更にはたとえ被膜が剥離したとしても溶融金属
と接触している間はコア部から新たな被膜が再生される
こと、等において、特開平４−２８０８８７号公報等の
従来の焼結型被覆層とは異なっているものである。The MgO.Al 2 O 3 spinel coating of the present invention is generally porous, has a continuous grain connection between spinels, and is denser than spinel particles in the core. At the interface of the core, the coating and the spinel of the core are also grain-bonded to each other and have high adhesion.For these reasons, even if thermal shock is applied or immersed in the molten metal for a long time, Japanese Unexamined Patent Publication No. Hei 4-280872 shows that the coating exhibits good erosion resistance and that a new coating is regenerated from the core portion while in contact with the molten metal even if the coating is peeled off. Are different from the conventional sintered type coating layer.
【００２０】[0020]
【実施例】以下、本発明を実施例、比較例をあげて更に
具体的に説明する。EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples.
【００２１】実施例１〜３ 比較例１〜２ 六方晶窒化硼素粉末（酸素量２％ 平均粒径４μｍ）と
ＭｇＯ・Ａｌ2 Ｏ3 スピネル粉末（平均粒径５μｍ）を
表１に示す割合とし、ボールミルで３時間、均一に混合
した。それを黒鉛ダイス中に充填し、１７００℃、２時
間ホットプレス焼結してＢＮ／スピネル複合焼結体を製
造した。この複合焼結体から、直径２０ｍｍ×長さ１５
０ｍｍの評価用サンプルを切削加工し、以下の方法に従
い、耐溶損性、粒子又は粒子塊の平均の大きさ、被膜の
形成の有無、及び耐熱衝撃性を測定した。それらの結果
を表１に示す。Examples 1 to 3 Comparative Examples 1 and 2 Hexagonal boron nitride powder (oxygen content 2%, average particle size 4 μm) and MgO.Al 2 O 3 spinel powder (average particle size 5 μm) were set in proportions shown in Table 1. The mixture was uniformly mixed in a ball mill for 3 hours. It was filled in a graphite die and hot-press sintered at 1700 ° C. for 2 hours to produce a BN / spinel composite sintered body. From this composite sintered body, a diameter of 20 mm and a length of 15 mm
A sample for evaluation of 0 mm was cut, and the erosion resistance, the average size of particles or particle mass, the presence or absence of a coating, and the thermal shock resistance were measured according to the following methods. Table 1 shows the results.
【００２２】（１）耐溶損性：評価用サンプルを１６０
０℃の溶銑中に８時間浸漬した後の直径の減少量を測定
した。 「○」：溶損量小で良好。「×」溶損量大。(1) Melting resistance: 160 samples for evaluation
The amount of decrease in diameter after immersion in hot metal at 0 ° C. for 8 hours was measured. "O": good with small amount of erosion. "X" Large amount of erosion.
【００２３】（２）粒子又は粒子塊の大きさ：ＣＯＭＰ
Ｏ像（１００倍）の６０ｍｍ×６０ｍｍの領域につい
て、最大のものから２０点の大きさのＢＮ及びスピネル
の粒子又は粒子塊の大きさを測定し、それを平均した。(2) Particle or particle mass: COMP
With respect to the 60 mm × 60 mm area of the O image (100 ×), the size of the BN and spinel particles or particle masses having the size of 20 points from the largest was measured and averaged.
【００２４】（３）被膜の形成：溶銑浸漬後の評価用サ
ンプルの目視観察と、断面のＳＥＭ観察を行い、コア部
表面への被膜の形成状態を調べた。 「○」：スピネル被膜形成が確認された。 「×」：被
膜形成なし。(3) Formation of Coating: The evaluation sample after immersion in the hot metal was visually observed and the cross section was observed by SEM to examine the state of formation of the coating on the core surface. "O": Spinel film formation was confirmed. “×”: No film formation.
【００２５】また、形成された被膜のＸ線回折を行った
ところ、ＭｇＯ・Ａｌ2 Ｏ3 スピネルが検出され、更に
ＥＰＭＡ分析を行った結果、微量のＳｉ、Ｃａが検出さ
れた。また、コア部は、ＢＮ／スピネル複合焼結体であ
り、微量のＣａＯ・Ｂ2 Ｏ3が含まれていることをＸ線
回折で確認した。Further, when the formed coating film was subjected to X-ray diffraction, MgO.Al 2 O 3 spinel was detected, and as a result of EPMA analysis, trace amounts of Si and Ca were detected. The core portion was a BN / spinel composite sintered body, and it was confirmed by X-ray diffraction that a small amount of CaO.B 2 O 3 was contained.
【００２６】（４）耐熱衝撃性：評価用サンプルを６０
０℃に予熱後、溶銑に浸漬した際に、サンプルに生じた
クラックの発生状況を目視で観察した。 「○」：クラックの発生なし。 「△」：小クラッ
クが発生。「×」：クラックが発生し折損した。(4) Thermal shock resistance: 60 samples for evaluation
After preheating to 0 ° C., when immersed in hot metal, the state of cracks generated in the sample was visually observed. "O": No cracks occurred. "△": Small cracks occurred. “×”: Cracks were generated and broken.
【００２７】実施例４ 六方晶窒化硼素粉末（酸素量３％ 平均粒径０．１μ
ｍ）とＭｇＯ・Ａｌ2 Ｏ 3 スピネル粉末（平均粒径０．
４μｍ）を用いたこと以外は、実施例１と同様にしてＢ
Ｎ／スピネル複合焼結体を製造した。その評価結果を表
１に示す。Example 4 Hexagonal boron nitride powder (oxygen content 3%, average particle size 0.1 μm)
m) and MgO · AlTwo O ThreeSpinel powder (average particle size of 0.
4 μm), except that B
An N / spinel composite sintered body was manufactured. Table showing the evaluation results
It is shown in FIG.
【００２８】実施例５ 実施例１で調合された六方晶窒化硼素粉末とＭｇＯ・Ａ
ｌ2 Ｏ3 スピネル粉末との混合粉末を、２ｔｏｎ／ｃｍ
2 の圧力でＣＩＰ成形後、１７００℃、２時間、窒素雰
囲気（１ｋｇ／ｃｍ2 ）で常圧焼結し、ＢＮ／スピネル
複合焼結体を製造した。その評価結果を表１に示した。Example 5 Hexagonal boron nitride powder prepared in Example 1 and MgO.A
powder mixed with l 2 O 3 spinel powder is 2 ton / cm
After CIP molding at second pressure, 1700 ° C., 2 hours, and pressureless sintering in a nitrogen atmosphere (1 kg / cm 2), to produce a BN / spinel composite sintered body. Table 1 shows the evaluation results.
【００２９】実施例６ ＭｇＯ・Ａｌ2 Ｏ3 スピネル粉末の代りに、ＭｇＯ粉末
とＡｌ2 Ｏ3 粉末の混合粉末を用いたこと以外は、実施
例１と同様にしてＢＮ／スピネル複合焼結体を製造し
た。その評価結果を表１に示す。Example 6 A BN / spinel composite sintered body was produced in the same manner as in Example 1 except that a mixed powder of MgO powder and Al 2 O 3 powder was used instead of the MgO · Al 2 O 3 spinel powder. Was manufactured. Table 1 shows the evaluation results.
【００３０】参考例１ 六方晶窒化硼素粉末とＭｇＯ・Ａｌ2 Ｏ3 スピネル粉末
とボールミルによる混合時間を１０分としたこと以外
は、実施例１と同様にしてＢＮ／スピネル複合焼結体を
製造した。その評価結果を表１に示す。Reference Example 1 A BN / spinel composite sintered body was produced in the same manner as in Example 1 except that the mixing time of the hexagonal boron nitride powder, the MgO.Al 2 O 3 spinel powder and the ball mill was changed to 10 minutes. did. Table 1 shows the evaluation results.
【００３１】[0031]
【表１】 [Table 1]
【００３２】実施例６ 実施例１で製造されたＢＮ／スピネル複合焼結体から、
５０ｍｍ角で厚さ３０ｍｍの直方体を切り出し、その表
面に４０ｍｍ角で深さ２０ｍｍの窪みを形成し容器を作
製した。この容器にＳＵＳ材１０ｇを投入し、アルゴン
ガス雰囲気下、１６５０℃で３０分間加熱処理した後、
容器内面の侵食状況を肉眼観察し、同様にして試験され
たＢＮ／Ｓｉ3 Ｎ4 複合焼結体容器と比較したところ、
本発明のＢＮ／スピネル複合焼結体容器のほうが耐溶損
性に優れていた。Example 6 From the BN / spinel composite sintered body manufactured in Example 1,
A rectangular parallelepiped of 50 mm square and 30 mm thick was cut out, and a 40 mm square and 20 mm deep recess was formed on the surface thereof to produce a container. 10 g of the SUS material was put into this container, and after a heat treatment at 1650 ° C. for 30 minutes under an argon gas atmosphere,
The state of erosion on the inner surface of the container was visually observed and compared with a BN / Si 3 N 4 composite sintered container that was similarly tested.
The BN / spinel composite sintered body container of the present invention had better erosion resistance.
【００３３】[0033]
【発明の効果】本発明のＢＮ／スピネル複合焼結体は、
従来のＢＮ／Ｓｉ3 Ｎ4 複合焼結体等に比べて溶融金属
に対する耐溶損性に優れたものである。このようなＢＮ
／スピネル複合焼結体は、溶融金属の例えば保護管、ノ
ズル等として使用することができる。また、ＭｇＯ・Ａ
ｌ2 Ｏ3 スピネル質被覆構造のＢＮ／Ｓｉ3 Ｎ4 複合焼
結体の製造用原料としても使用することができる。The BN / spinel composite sintered body of the present invention
Compared to conventional BN / Si 3 N 4 composite sintered bodies and the like, it has excellent erosion resistance to molten metal. Such a BN
The / spinel composite sintered body can be used as a molten metal, for example, as a protective tube, a nozzle or the like. Also, MgO · A
It can also be used as a raw material for producing a BN / Si 3 N 4 composite sintered body having a l 2 O 3 spinel coating structure.
【００３４】本発明のＭｇＯ・Ａｌ2 Ｏ3 スピネル質被
覆構造のＢＮ／スピネル複合焼結体は、溶融金属に対す
る耐溶損性、耐熱衝撃性に極めて優れたものであり、し
かも長時間の浸漬においても溶損量が非常に少ないもの
である。このようなＢＮ／スピネル複合焼結体は、溶融
金属の例えば保護管、ノズル等として使用することがで
きる。The BN / spinel composite sintered body having the MgO.Al 2 O 3 spinel-coated structure of the present invention has extremely excellent erosion resistance and thermal shock resistance to a molten metal, and can be used for a long period of immersion. Also have a very small amount of erosion. Such a BN / spinel composite sintered body can be used as a molten metal, for example, as a protective tube, a nozzle or the like.
フロントページの続き (72)発明者 中村 美幸 福岡県大牟田市新開町１ 電気化学工業株 式会社大牟田工場内Continued on the front page (72) Inventor Miyuki Nakamura 1 Shinkaicho, Omuta-shi, Fukuoka Prefecture Inside the Omuta Plant of Denki Kagaku Kogyo Co., Ltd.
Claims (2)
ｇＯ・Ａｌ2 Ｏ3 スピネル９０〜１０重量％とからなる
窒化硼素とスピネルの複合焼結体。1 to 10% by weight of hexagonal boron nitride;
A composite sintered body of boron nitride and spinel consisting of gO.Al 2 O 3 spinel 90 to 10% by weight.
ピネルの複合焼結体の表面に、ＭｇＯ・Ａｌ2 Ｏ3 スピ
ネル質を主成分とする被膜が形成されてなることを特徴
とする窒化硼素とスピネルの複合焼結体。2. A composite film comprising hexagonal boron nitride and MgO.Al 2 O 3 spinel formed on the surface of a composite sintered body of MgO.Al 2 O 3 spinel. Composite sintered body of boron nitride and spinel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25307597A JP3587493B2 (en) | 1997-09-18 | 1997-09-18 | Composite sintered body of boron nitride and spinel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25307597A JP3587493B2 (en) | 1997-09-18 | 1997-09-18 | Composite sintered body of boron nitride and spinel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1192230A true JPH1192230A (en) | 1999-04-06 |
| JP3587493B2 JP3587493B2 (en) | 2004-11-10 |
Family
ID=17246152
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25307597A Expired - Fee Related JP3587493B2 (en) | 1997-09-18 | 1997-09-18 | Composite sintered body of boron nitride and spinel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3587493B2 (en) |
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1997
- 1997-09-18 JP JP25307597A patent/JP3587493B2/en not_active Expired - Fee Related
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| JP3587493B2 (en) | 2004-11-10 |
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