JP2001080960A - Production of zirconia refractory and zirconia refractory manufactured by the same - Google Patents
Production of zirconia refractory and zirconia refractory manufactured by the sameInfo
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- JP2001080960A JP2001080960A JP25120599A JP25120599A JP2001080960A JP 2001080960 A JP2001080960 A JP 2001080960A JP 25120599 A JP25120599 A JP 25120599A JP 25120599 A JP25120599 A JP 25120599A JP 2001080960 A JP2001080960 A JP 2001080960A
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- zirconia
- powder
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- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、熱膨脹係数が小
さく、したがって、繰り返し高温に加熱されてもクラッ
クが発生することのない耐久性に優れたジルコニア耐火
物の製造方法およびこの製造方法により作製したジルコ
ニア耐火物に関するものであり、特にこの発明は、熱膨
脹係数が小さく、したがって、繰り返し高温に加熱され
てもクラックが発生することのない耐久性に優れたジル
コニア耐火物からなる電子セラミックス部品、磁性材料
などを焼成するためのセッターの製造方法およびこの製
造方法により作製したジルコニア耐火物製セッターに関
するものである。The present invention relates to a method for producing a zirconia refractory which has a small coefficient of thermal expansion and is excellent in durability without cracks even when repeatedly heated to a high temperature, and has been produced by this method. The present invention relates to a zirconia refractory, and more particularly to an electronic ceramic component and a magnetic material made of a zirconia refractory having a small coefficient of thermal expansion and thus having excellent durability without cracks even when repeatedly heated to a high temperature. The present invention relates to a method for producing a setter for firing such as, and a zirconia refractory setter produced by the method.
【０００２】[0002]
【従来の技術】従来、純粋のジルコニアは融点が２７１
５℃と高く、耐食性にも優れているために、耐熱または
耐火材料として多く使用されているが、ジルコニアは１
０００℃付近に単斜晶系から正方晶系へ転移する体積変
化を伴う相変態があるために、ジルコニア粉末を成形、
焼成して得られた耐火物は、温度が上昇して１０００℃
付近に近付くと体積が急激に変化し、クラックが発生し
たり形状が崩れたりするところから耐火物として使用す
ることはできない。そのため、ジルコニアに外量で数重
量％のＣａＯ，Ｙ2 Ｏ3 ，ＭｇＯ，ＣｅＯ2 などの安定
化剤を固溶したジルコニア（以下、安定化ジルコニアと
呼ぶ）粉末を作製し、この安定化ジルコニア粉末を成
形、焼成することにより耐火物（例えばセッターなど）
を製造している。この安定化ジルコニア粉末は電融炉で
溶融したジルコニアに外量で数重量％のＣａＯ，Ｙ2 Ｏ
3 ，ＭｇＯ，ＣｅＯ2 などの安定化剤を添加し固溶し、
粉砕することにより製造するものであるが、ジルコニア
は融点が２７１５℃と高いところから電融炉で溶融する
には大規模で高価な装置を必要とし、したがって、安定
化ジルコニア粉末は高価なものとならざるを得ない。2. Description of the Related Art Conventionally, pure zirconia has a melting point of 271.
Because of its high temperature of 5 ° C and excellent corrosion resistance, it is often used as a heat-resistant or fire-resistant material.
Since there is a phase transformation accompanied by a volume change from monoclinic to tetragonal around 000 ° C, zirconia powder is molded,
The temperature of the refractory obtained by firing is 1000 ° C.
When it approaches the vicinity, the volume changes drastically, and it cannot be used as a refractory because of the occurrence of cracks and the collapse of the shape. Therefore, zirconia (hereinafter, referred to as stabilized zirconia) powder in which a stabilizer such as CaO, Y 2 O 3 , MgO, and CeO 2 in an external amount of several weight% is dissolved in zirconia is prepared. Refractory (for example, setter) by molding and firing powder
Has been manufactured. This stabilized zirconia powder is added to zirconia melted in an electric melting furnace by an amount of several weight% of CaO, Y 2 O.
3 , Add a stabilizer such as MgO, CeO 2 and solid solution,
Although zirconia is manufactured by pulverization, zirconia has a high melting point of 2715 ° C. and requires a large-scale and expensive apparatus for melting in an electric melting furnace. Therefore, stabilized zirconia powder is expensive. I have to be.
【０００３】そのために、単斜晶系の天然ジルコニアを
一部使用してジルコニア耐火物を製造しようとする試み
も成されている。この方法は、特開平２−１６４７６７
号公報に記載されているように、４２〜１００メッシュ
（１４９〜４００μｍ）：２２〜２８重量％、１００〜
２００メッシュ（７４〜１４９μｍ）：２２〜２８重量
％、３２５メッシュアンダー（４４μｍ以下）：３０〜
３５重量％に粒度調整された安定化ジルコニアに、平均
粒径１０μｍ以下に粒度調整された単斜晶系の天然ジル
コニア（例えば、バテライト）を５〜２５重量％混合
し、得られた混合粉末を成形し、焼成する方法である。
この方法で得られたジルコニア耐火物は、単斜晶系の天
然ジルコニアを一部原料粉末として使用しているため
に、コストを低く抑えることができ、しかも高い強度と
耐食性を有し、熱膨脹係数が低い特性を有している。[0003] For this reason, attempts have been made to produce zirconia refractories by partially using monoclinic natural zirconia. This method is disclosed in JP-A-2-164767.
No. 42, 100 mesh (149 to 400 μm): 22 to 28% by weight, 100 to 100%
200 mesh (74 to 149 μm): 22 to 28% by weight, 325 mesh under (44 μm or less): 30 to
5 to 25% by weight of monoclinic natural zirconia (for example, vaterite) having a particle size adjusted to an average particle size of 10 μm or less is mixed with stabilized zirconia having a particle size adjusted to 35% by weight, and the obtained mixed powder is mixed. It is a method of molding and firing.
Since the zirconia refractory obtained by this method partially uses monoclinic natural zirconia as a raw material powder, the cost can be kept low, and it has high strength and corrosion resistance, and has a coefficient of thermal expansion. Have low characteristics.
【０００４】[0004]
【発明が解決しようとする課題】しかし、この方法で得
られたジルコニア耐火物は高い強度と耐食性を有し、熱
膨脹係数が低い特性を有しているものの、熱サイクルを
伴う使用を繰り返すとクラックの発生は避けられず、十
分な耐久性が得られないという欠点があった。例えば、
圧電素子、誘電体などの電子セラミックス材料の焼成に
は支持台としてジルコニア耐火物製セッターが使用され
るが、近年、電子セラミックス部品の一層の値下げ要求
が激しくなっているために、この電子セラミックス部品
を焼成するためのセッターのコストダウンが求められ、
またセッターを一層長期間繰り返し使用することをが求
められている。しかし、従来のジルコニア耐火物製セッ
ターは耐久性という観点から見て十分に満足できるもの
ではなかった。However, the zirconia refractories obtained by this method have high strength and corrosion resistance and low thermal expansion coefficients, but when used repeatedly with thermal cycling, cracks occur. There is a drawback that generation of unavoidable is inevitable and sufficient durability cannot be obtained. For example,
A zirconia refractory setter is used as a support for the firing of electronic ceramic materials such as piezoelectric elements and dielectrics. Cost reduction of the setter for firing
Further, there is a demand for the re-use of the setter for a longer period of time. However, the conventional zirconia refractory setters have not been sufficiently satisfactory from the viewpoint of durability.
【０００５】[0005]
【課題を解決するための手段】そこで、本発明者等は、
上述のような観点から、一層の高強度と耐食性を有し、
低価格でかつ繰り返し使用に耐えることのできるジルコ
ニア耐火物を開発すべく研究を行った結果、従来の特開
平２−１６４７６７号公報に記載の粒度調整された安定
化ジルコニア粉末の添加量を少くし、それに伴って平均
粒径１０μｍ以下に粒度調整された単斜晶系の天然ジル
コニアの混合割合を増やし、さらに水酸化カルシウムま
たは酸化カルシウム粉末を添加混合して得られた混合粉
末を作製し、この混合粉末を成形し、焼成して得られた
ジルコニア耐火物は、従来のジルコニア耐火物と比べ
て、熱膨脹係数が低く、耐食性、耐久性および強度が向
上し、さらに原料粉末として高価な安定化ジルコニア粉
末の添加量を少くし、安価な単斜晶系の天然ジルコニア
粉末を多く添加するのでコストを下げることができる、
という研究結果が得られたのである。Means for Solving the Problems Accordingly, the present inventors have
In view of the above, it has even higher strength and corrosion resistance,
As a result of researching to develop a zirconia refractory which is inexpensive and can withstand repeated use, the amount of the stabilized zirconia powder having a controlled particle size described in the prior art JP-A-2-164767 was reduced. Accordingly, the mixing ratio of monoclinic natural zirconia whose particle size has been adjusted to an average particle size of 10 μm or less was increased, and a mixed powder obtained by adding and mixing calcium hydroxide or calcium oxide powder was produced. The zirconia refractory obtained by molding and firing the mixed powder has a lower coefficient of thermal expansion, improved corrosion resistance, durability, and strength than conventional zirconia refractories, and is furthermore expensive stabilized zirconia as a raw material powder. The amount of powder added is reduced, and the cost can be reduced because a large amount of inexpensive monoclinic natural zirconia powder is added.
The research result was obtained.
【０００６】この発明は、上記の研究結果に基づいてな
されたものであって、 （１）粒径：１４９〜４００μｍの安定化ジルコニア粉
末：１０〜２０重量％、 粒径：７４〜１４９μｍ未満の安定化ジルコニア粉末：
１０〜２０重量％、 粒径：４４μｍ以下の安定化ジルコニア粉末：２０〜３
０重量％、 粒径：１０μｍ以下の単斜晶系天然ジルコニア粉末：３
０〜６０重量％、 からなる配合組成の混合粉末に、さらに水酸化カルシウ
ム粉末を酸化カルシウム換算値でまたは酸化カルシウム
粉末をいずれも外量で３．０〜４．０重量％添加し混合
して得られた混合粉末を成形し、焼成する耐久性に優れ
たジルコニア耐火物の製造方法、 （２）前記（１）記載の製造方法で作製した耐久性に優
れたジルコニア耐火物、に特徴を有するものである。The present invention has been made on the basis of the above-mentioned research results. (1) A stabilized zirconia powder having a particle size of 149 to 400 μm: 10 to 20% by weight, a particle size of 74 to less than 149 μm Stabilized zirconia powder:
10 to 20% by weight, particle size: stabilized zirconia powder having a particle size of 44 μm or less: 20 to 3
0% by weight, particle size: monoclinic natural zirconia powder of 10 μm or less: 3
0 to 60% by weight, and 3.0 to 4.0% by weight of calcium hydroxide powder in terms of calcium oxide equivalent or calcium oxide powder are added to the mixed powder having a composition of: A method for producing a zirconia refractory having excellent durability, which is obtained by molding and firing the obtained mixed powder, and (2) a zirconia refractory having excellent durability produced by the production method described in (1) above. Things.
【０００７】この発明の製造方法で作られたジルコニア
耐火物は耐久性に優れているところから、各種の製品を
焼成するための支持体あるいは電気炉、ガス炉の耐火物
として使用できるが、特に電子セラッミク部品、磁性材
料などの電子材料を焼成するためのセッターとして好適
である。したがって、この発明は、 （３）粒径：１４９〜４００μｍの安定化ジルコニア粉
末：１０〜２０重量％、 粒径：７４〜１４９μｍ未満の安定化ジルコニア粉末：
１０〜２０重量％、 粒径：４４μｍ以下の安定化ジルコニア粉末：２０〜３
０重量％、 粒径：１０μｍ以下の単斜晶系天然ジルコニア粉末：３
０〜６０重量％、 からなる配合組成の混合粉末に、さらに水酸化カルシウ
ム粉末を酸化カルシウム換算値でまたは酸化カルシウム
粉末をいずれも外量で３．０〜４．０重量％添加し混合
して得られた混合粉末を成形し、焼成する耐久性に優れ
たジルコニア耐火物製セッターの製造方法、 （４）前記（３）記載の製造方法で作製した耐久性に優
れたジルコニア耐火物製セッター、に特徴を有するもの
である。The zirconia refractory produced by the production method of the present invention has excellent durability, and therefore can be used as a support for firing various products or as a refractory for electric furnaces and gas furnaces. It is suitable as a setter for firing electronic materials such as electronic ceramic parts and magnetic materials. Therefore, the present invention provides: (3) a stabilized zirconia powder having a particle size of 149 to 400 μm: 10 to 20% by weight; a stabilized zirconia powder having a particle size of 74 to less than 149 μm:
10 to 20% by weight, particle size: stabilized zirconia powder having a particle size of 44 μm or less: 20 to 3
0% by weight, particle size: monoclinic natural zirconia powder of 10 μm or less: 3
0 to 60% by weight, and 3.0 to 4.0% by weight of calcium hydroxide powder in terms of calcium oxide equivalent or calcium oxide powder are added to the mixed powder having a composition of: A method for manufacturing a durable zirconia refractory setter, which is obtained by molding and firing the obtained mixed powder, (4) a durable zirconia refractory setter prepared by the method described in (3) above; It is characterized by the following.
【０００８】この発明の耐久性に優れたジルコニア耐火
物の製造方法で粒径：１０μｍ以下の単斜晶系天然ジル
コニア粉末の添加量を３０〜６０重量％にしたのは、３
０重量％未満では絶対的な熱膨張係数が大きくなり、得
られたジルコニア耐火物製セッターを繰り返し使用する
とクラックが発生して十分な耐久性が得られないので好
ましくなく、一方、６０％重量を越えて添加すると、微
粉量が多くなりすぎて、相対的に粗粉末量が少くなり過
ぎることから粒度配合上、成形が難しく、歩留まりが著
しく低下するので好ましくないことによるものである。
粒径：１０μｍ以下の単斜晶系天然ジルコニア粉末の添
加量は４５〜５５重量％の範囲にあることが一層好まし
い。この発明の耐久性に優れたジルコニア耐火物の製造
方法で添加する水酸化カルシウム粉末を酸化カルシウム
換算値でまたは酸化カルシウム粉末をいずれも外量で
３．０〜４．０重量％にしたのは、３．０重量％未満の
添加では得られたジルコニア耐火物を十分に安定化させ
ることができず、繰り返し使用するとクラックが発生し
て十分な耐久性が得られないので好ましくなく、一方、
４．０％重量を越えて添加すると、安定化に寄与しない
水酸化カルシウムまたは酸化カルシウムが含まれて強度
が低下するので好ましくないことによるものである。In the method for producing a zirconia refractory having excellent durability according to the present invention, the amount of the monoclinic natural zirconia powder having a particle size of 10 μm or less is set to 30 to 60% by weight.
If it is less than 0% by weight, the absolute coefficient of thermal expansion becomes large, and if the obtained zirconia refractory setter is used repeatedly, cracks occur and sufficient durability cannot be obtained. If it is added in excess, the amount of fine powder becomes too large and the amount of coarse powder becomes relatively small, so molding is difficult in terms of particle size blending, and the yield is significantly reduced, which is not preferable.
The addition amount of the monoclinic natural zirconia powder having a particle size of 10 μm or less is more preferably in the range of 45 to 55% by weight. The reason why the calcium hydroxide powder added in the method for producing a zirconia refractory having excellent durability according to the present invention is 3.0 to 4.0% by weight in terms of calcium oxide or in terms of the external amount of both calcium oxide powders is as follows. If the addition is less than 3.0% by weight, the obtained zirconia refractory cannot be sufficiently stabilized, and if used repeatedly, cracks occur and sufficient durability cannot be obtained, which is not preferable.
If the content exceeds 4.0% by weight, calcium hydroxide or calcium oxide which does not contribute to stabilization is contained, and the strength is lowered.
【０００９】この発明の耐久性に優れたジルコニア耐火
物は、粒径：１４９〜４００μｍの安定化ジルコニア粉
末：１０〜２０重量％、粒径：７４〜１４９μｍ未満の
安定化ジルコニア粉末：１０〜２０重量％、粒径：４４
μｍ以下の安定化ジルコニア粉末：２０〜３０重量％、
粒径：１０μｍ以下の単斜晶系天然ジルコニア粉末：３
０〜６０重量％からなる配合組成の混合粉末に、さらに
水酸化カルシウム粉末を酸化カルシウム換算値でまたは
酸化カルシウム粉末をいずれも外量で３．０〜４．０重
量％添加し、混合し、得られた混合粉末を成形したのち
焼成することにより作製する。前記水酸化カルシウムま
たは酸化カルシウム粉末の添加は、水酸化カルシウム粉
末を添加する方が酸化カルシウム粉末を添加するよりも
熱サイクル回数の多いジルコニア耐火物を得ることがで
きるので好ましい。また混合粉末の成形体を焼成するた
めの温度は１５００〜１５５０℃である。このようにし
て得られたジルコニア耐火物は、従来よりも熱膨張係数
を下げることができ、熱サイクルに対する強度が向上
し、使用寿命が延びる。その理由として従来のジルコニ
ア耐火物よりも微細な安定化粉末が増えたことによるも
のと考えられる。The highly durable zirconia refractory of the present invention is a stabilized zirconia powder having a particle size of 149 to 400 μm: 10 to 20% by weight, and a stabilized zirconia powder having a particle size of 74 to less than 149 μm: 10 to 20. % By weight, particle size: 44
μm or less stabilized zirconia powder: 20 to 30% by weight,
Particle size: monoclinic natural zirconia powder of 10 μm or less: 3
To a mixed powder having a composition of 0 to 60% by weight, calcium hydroxide powder is added in an amount of 3.0 to 4.0% by weight in terms of calcium oxide, or both are added and mixed, and mixed. The obtained mixed powder is formed by molding and then firing. The addition of the calcium hydroxide or calcium oxide powder is preferred because the addition of calcium hydroxide powder can provide a zirconia refractory having a larger number of thermal cycles than the addition of calcium oxide powder. The temperature for firing the mixed powder compact is 1500 to 1550 ° C. The zirconia refractory obtained in this way can have a lower coefficient of thermal expansion than before, improve the strength against thermal cycling, and extend the service life. It is considered that the reason for this is that finer stabilized powders than conventional zirconia refractories have increased.
【００１０】[0010]
【発明の実施の形態】原料粉末として、酸化カルシウム
で安定化した電融ジルコニアを粉砕して得られた表１に
示される粒度の安定化ジルコニア粉末および単斜晶系天
然ジルコニアを粉砕して得られた粒径：１０μｍ以下の
天然ジルコニア粉末を用意した。これら原料粉末を表１
に示される割合で配合し混合して混合粉末を作製し、さ
らにこの混合粉末に、水酸化カルシウム粉末を酸化カル
シウム換算値でまたは酸化カルシウム粉末をいずれも外
量で表１に示される割合に配合し混合して混合粉末を作
製し、得られた混合粉末を成形して縦：１００ｍｍ×
横：１００ｍｍ×高さ：４ｍｍの寸法をもった圧粉体を
作製し、この圧粉体を大気雰囲気中、温度：１５００℃
に２時間保持した後、放冷の条件で焼結することにより
表１に示される本発明ジルコニア耐火物（以下、本発明
耐火物と云う）１〜５および従来ジルコニア耐火物（以
下、従来耐火物と云う）１〜２を作製した。BEST MODE FOR CARRYING OUT THE INVENTION As raw material powder, stabilized zirconia powder having a particle size shown in Table 1 obtained by grinding electrofused zirconia stabilized by calcium oxide and monoclinic natural zirconia are obtained. A prepared natural zirconia powder having a particle size of 10 μm or less was prepared. Table 1 shows these raw material powders.
Is mixed in the proportions shown in Table 1 to prepare a mixed powder, and further, calcium hydroxide powder is added to this mixed powder in terms of calcium oxide or calcium oxide powder is added in the external amount in the proportions shown in Table 1. And mixed to prepare a mixed powder, and the obtained mixed powder is molded and lengthwise: 100 mm ×
A green compact having dimensions of 100 mm in width × 4 mm in height was prepared, and this green compact was heated in an air atmosphere at a temperature of 1500 ° C.
After sintering for 2 hours, the zirconia refractories of the present invention (hereinafter referred to as the present refractories) 1 to 5 and the conventional zirconia refractories (hereinafter referred to as conventional refractories) shown in Table 1 1) and 2).
【００１１】これら本発明耐火物１〜５および従来耐火
物１〜２について、密度および曲げ強度を測定し、さら
に熱サイクル試験を行い、それらの結果を表１に示し
た。なお、前記熱サイクル試験は、本発明耐火物１〜５
および従来耐火物１〜２をそれぞれアルミナ敷板上に載
置した後これを電気炉に装入し、常温から１４５０℃ま
でを２００℃／ｈｒにて昇温し、１４５０℃で２時間保
持した後、１４５０℃から常温まで２００℃／ｈｒにて
降温する焼成パターンを１熱サイクルとし、クラックが
発生するまで繰り返し行ってクラックの発生が顕在化し
て使用不可になるまでの熱サイクル回数を測定すること
により行った。The refractories 1 to 5 of the present invention and the conventional refractories 1 and 2 were measured for density and bending strength, and further subjected to a heat cycle test. The results are shown in Table 1. The heat cycle test was performed according to the present refractories 1-5.
After placing the conventional refractories 1 and 2 on the alumina base plate, respectively, they were placed in an electric furnace, and the temperature was raised from room temperature to 1450 ° C. at 200 ° C./hr, and held at 1450 ° C. for 2 hours. A firing pattern in which the temperature is decreased from 200 to 1450 ° C. at a rate of 200 ° C./hr is defined as one heat cycle, and is repeated until a crack is generated, and the number of heat cycles until the crack becomes apparent and becomes unusable is measured. Was performed.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【発明の効果】表１に示される結果から、本発明耐火物
１〜５は従来耐火物１〜２に比べて、いずれも高密度で
かつ曲げ強度が大きく、さらに使用不可になるまでの熱
サイクル回数も格段に多いことから、耐久性に優れてい
ることが明らかである。上述のように、この発明の製造
方法で作製したジルコニア耐火物は、優れた特性を有す
るだけでなく、使用する原料粉末も安価な単斜晶系天然
ジルコニア粉末を多く使用するところから、コストを下
げることができ、特にコスト要求の激しい電子材料の焼
成用セッターとして有用なものである。From the results shown in Table 1, the refractories 1 to 5 of the present invention have higher densities and higher flexural strengths than the conventional refractories 1 and 2, and furthermore, the heat required until they become unusable. Since the number of cycles is remarkably large, it is clear that the durability is excellent. As described above, the zirconia refractory produced by the production method of the present invention not only has excellent properties, but also uses a large amount of inexpensive monoclinic natural zirconia powder as a raw material powder to be used. It can be reduced, and is particularly useful as a firing setter for electronic materials, which are extremely costly.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4G030 AA07 AA08 AA12 AA14 AA17 BA25 GA09 GA11 GA13 HA25 4G031 AA03 AA04 AA07 AA08 AA12 BA25 GA02 GA03 GA04 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4G030 AA07 AA08 AA12 AA14 AA17 BA25 GA09 GA11 GA13 HA25 4G031 AA03 AA04 AA07 AA08 AA12 BA25 GA02 GA03 GA04
Claims (4)
コニア粉末：１０〜２０重量％、 粒径：７４〜１４９μｍ未満の安定化ジルコニア粉末：
１０〜２０重量％、 粒径：４４μｍ以下の安定化ジルコニア粉末：２０〜３
０重量％、 粒径：１０μｍ以下の単斜晶系天然ジルコニア粉末：３
０〜６０重量％、からなる配合組成の混合粉末に、さら
に水酸化カルシウム粉末を酸化カルシウム換算値でまた
は酸化カルシウム粉末をいずれも外量で３．０〜４．０
重量％添加し混合して得られた混合粉末を成形し、焼成
することを特徴とする耐久性に優れたジルコニア耐火物
の製造方法。1. A stabilized zirconia powder having a particle size of 149 to 400 μm: 10 to 20% by weight, a stabilized zirconia powder having a particle size of 74 to less than 149 μm:
10 to 20% by weight, particle size: stabilized zirconia powder having a particle size of 44 μm or less: 20 to 3
0% by weight, particle size: monoclinic natural zirconia powder of 10 μm or less: 3
0 to 60% by weight of the mixed powder, and further, calcium hydroxide powder in terms of calcium oxide or calcium oxide powder in an external amount of 3.0 to 4.0.
A method for producing a highly durable zirconia refractory, comprising molding and firing a mixed powder obtained by adding and mixing by weight%.
を特徴とする耐久性に優れたジルコニア耐火物。2. A zirconia refractory having excellent durability, produced by the production method according to claim 1.
コニア粉末：１０〜２０重量％、 粒径：７４〜１４９μｍ未満の安定化ジルコニア粉末：
１０〜２０重量％、 粒径：４４μｍ以下の安定化ジルコニア粉末：２０〜３
０重量％、 粒径：１０μｍ以下の単斜晶系天然ジルコニア粉末：３
０〜６０重量％、からなる配合組成の混合粉末に、さら
に水酸化カルシウム粉末を酸化カルシウム換算値でまた
は酸化カルシウム粉末をいずれも外量で３．０〜４．０
重量％添加し混合して得られた混合粉末を成形し、焼成
することを特徴とする耐久性に優れたジルコニア耐火物
製セッターの製造方法。3. A stabilized zirconia powder having a particle size of 149 to 400 μm: 10 to 20% by weight, a stabilized zirconia powder having a particle size of 74 to less than 149 μm:
10 to 20% by weight, particle size: stabilized zirconia powder having a particle size of 44 μm or less: 20 to 3
0% by weight, particle size: monoclinic natural zirconia powder of 10 μm or less: 3
0 to 60% by weight of the mixed powder, and further, calcium hydroxide powder in terms of calcium oxide or calcium oxide powder in an external amount of 3.0 to 4.0.
A method for producing a zirconia refractory setter having excellent durability, comprising molding and firing a mixed powder obtained by adding and mixing by weight.
を特徴とする耐久性に優れたジルコニア耐火物製セッタ
ー。4. A durable zirconia refractory setter produced by the production method according to claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25120599A JP2001080960A (en) | 1999-09-06 | 1999-09-06 | Production of zirconia refractory and zirconia refractory manufactured by the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25120599A JP2001080960A (en) | 1999-09-06 | 1999-09-06 | Production of zirconia refractory and zirconia refractory manufactured by the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001080960A true JP2001080960A (en) | 2001-03-27 |
Family
ID=17219268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25120599A Pending JP2001080960A (en) | 1999-09-06 | 1999-09-06 | Production of zirconia refractory and zirconia refractory manufactured by the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001080960A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2090554A1 (en) * | 2008-02-18 | 2009-08-19 | Refractory Intellectual Property GmbH & Co. KG | Refractory slag band |
| KR20180037382A (en) * | 2016-10-04 | 2018-04-12 | 주식회사 우진더블유티피 | Ceramic reflector of high quality and low cost for crystal growth of oxides and manufacturing method thereof |
| US10407349B2 (en) | 2015-04-24 | 2019-09-10 | Corning Incorporated | Bonded zirconia refractories and methods for making the same |
-
1999
- 1999-09-06 JP JP25120599A patent/JP2001080960A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2090554A1 (en) * | 2008-02-18 | 2009-08-19 | Refractory Intellectual Property GmbH & Co. KG | Refractory slag band |
| WO2009103949A1 (en) * | 2008-02-18 | 2009-08-27 | Refractory Intellectual Property Gmbh & Co Kg | Refractory slag band |
| EA017317B1 (en) * | 2008-02-18 | 2012-11-30 | Рефректори Интеллекчуал Проперти Гмбх Унд Ко Кг | A refractory article for ladle as the ladle shroud, stopper rod, submerged entry nozzle or tube |
| US20130045856A1 (en) * | 2008-02-18 | 2013-02-21 | Norman Edward Rogers | Refractory slag band |
| US8809214B2 (en) * | 2008-02-18 | 2014-08-19 | Refractory Intellectual Property Gmbh & Co. Kg | Refractory slag band |
| US10407349B2 (en) | 2015-04-24 | 2019-09-10 | Corning Incorporated | Bonded zirconia refractories and methods for making the same |
| KR20180037382A (en) * | 2016-10-04 | 2018-04-12 | 주식회사 우진더블유티피 | Ceramic reflector of high quality and low cost for crystal growth of oxides and manufacturing method thereof |
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