JPS6183627A - Production of powdery zirconium oxide - Google Patents
Production of powdery zirconium oxideInfo
- Publication number
- JPS6183627A JPS6183627A JP59205950A JP20595084A JPS6183627A JP S6183627 A JPS6183627 A JP S6183627A JP 59205950 A JP59205950 A JP 59205950A JP 20595084 A JP20595084 A JP 20595084A JP S6183627 A JPS6183627 A JP S6183627A
- Authority
- JP
- Japan
- Prior art keywords
- zirconium
- water
- seeds
- added
- hydroxide
- 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.)
- Granted
Links
Abstract
Description
【発明の詳細な説明】
本発明は部分安定化酸化ジルコニウム粉体の製造方法に
関するものであり、更に詳細には中和共沈法により水酸
化ジルコニウムを析出せしめるに当たり、種子として少
量の水酸化ジルコニウムを添加することを特徴とする酸
化ジルコニウム粉体の製造方法に関するものである。Detailed Description of the Invention The present invention relates to a method for producing partially stabilized zirconium oxide powder, and more specifically, in precipitating zirconium hydroxide by a neutralization coprecipitation method, a small amount of zirconium hydroxide is used as seeds. The present invention relates to a method for producing zirconium oxide powder, which comprises adding zirconium oxide powder.
近年部分安定化酸化ジルコニウム粉体は高強度、高靭性
の酸化ジルコニウム成形体が広範な分野において使用さ
れるようになったため種々その製造方法が検討されてい
る。この部分安定化酸化ジルコニウム粉体の製造方法と
しては、■水溶性ジルコニウム化合物にイツトリウム、
マグネシウム、セリウム、カルシウム等の化合物を安定
化剤として加え、次いでアルカリで中和処理した後濾過
、水洗し、乾燥、焼成する方法、■オキシ塩化ジルコニ
ウムまたはジルコニウムアルコキシドに安定化剤を加え
、加水分解させて得た水酸化物を乾燥、焼成する方法、
等がある。In recent years, partially stabilized zirconium oxide powders have come to be used in a wide range of fields as high-strength, high-toughness zirconium oxide molded bodies, and various methods for producing them have been studied. As for the production method of this partially stabilized zirconium oxide powder, ■ Yttrium is added to the water-soluble zirconium compound.
A method in which compounds such as magnesium, cerium, and calcium are added as a stabilizer, and then neutralized with an alkali, followed by filtration, washed with water, dried, and calcined.■ A stabilizer is added to zirconium oxychloride or zirconium alkoxide, and hydrolyzed. A method of drying and firing the hydroxide obtained by
etc.
■の方法は■の加水分解法に比較し原料が廉価で工業的
規模での生産が可能であるとの利点を有するものの水酸
化ジルコニウムに安定化剤が均質に分散していないため
か析出物である水酸化ジルコニウムを主体とするゲル（
以下単に水酸化ジルコニウムと称する）を乾燥、焼成し
ても均質な組成及び結晶子を有する部分安定化酸化ジル
コニウム粉体が得られないという欠点ををする。Method (2) has the advantage that the raw materials are cheaper than the hydrolysis method (2) and can be produced on an industrial scale. A gel mainly composed of zirconium hydroxide (
Even if zirconium hydroxide (hereinafter simply referred to as zirconium hydroxide) is dried and calcined, a partially stabilized zirconium oxide powder having a homogeneous composition and crystallites cannot be obtained.
かかる事情下に鑑み本発明者等は、中和共沈法における
上述の欠点を解決すべく鋭意検討した結果、イツトリウ
ム、マグネシウム、セリウム、カルシウム等の金属塩を
酸化ジルコニウムに対し２．５〜４．０モル％となるよ
うに添加した水溶液のｐ Ｈが約４〜５近傍に於いて水
溶液の粘度が急増し、溶液の全体攪拌が困難な状態を生
起し、ｐＨが約５を越えると再び溶液粘度が低下すると
いう現象が生じることを見出した。しかしてこの中和処
理時に於ける溶液の一時的粘度上昇が安定化剤としての
水酸化物のジルコニウムの水酸化物の粒子表面或いは粒
子近傍への均質な析出を妨げ、結果として均質な組成及
び結晶子を有する部分安定化酸化ジルコニウム粉体を得
ることが出来ない原因であると推定し、中和処理時に於
いて粘度上昇が少なく、析出反応系の均一な攪拌が可能
な方法を見出すべく更に研究を市ねた結果、中和処理に
際し予め水溶液中に析出する水酸化ジルコニウムの核と
なるような種子水酸化ジルコニウムを添加存在せしめる
場合にはｐＨ４〜５の段階に於いても殆ど粘度上昇を招
くことな（中和処理し得ることを見出し、本発明を完成
するに至った。In view of these circumstances, the inventors of the present invention have made extensive studies to solve the above-mentioned drawbacks of the neutralization coprecipitation method, and have found that metal salts such as yttrium, magnesium, cerium, and calcium have a ratio of 2.5 to 4 to zirconium oxide. The viscosity of the aqueous solution increases rapidly when the pH of the aqueous solution added to the solution is around 4 to 5, making it difficult to stir the entire solution, and when the pH exceeds about 5, It has been found that a phenomenon occurs in which the viscosity of the solution decreases. However, the temporary increase in viscosity of the solution during the neutralization process prevents the homogeneous precipitation of zirconium hydroxide as a stabilizer on the particle surface or in the vicinity of the particles, resulting in a homogeneous composition and We presume that this is the reason why it is not possible to obtain partially stabilized zirconium oxide powder with crystallites, and we are working further to find a method that minimizes the increase in viscosity during neutralization and allows for uniform stirring of the precipitation reaction system. As a result of research, we have found that when seed zirconium hydroxide is added in advance to form the nucleus of zirconium hydroxide precipitated in an aqueous solution during neutralization treatment, there is almost no increase in viscosity even at a pH of 4 to 5. The present inventors have discovered that it is possible to perform neutralization treatment without causing any harmful effects, and have completed the present invention.
すなわち本発明は、焼成後の組成が酸化物換算で酸化ジ
ルコニウムに対し酸化イツトリウム、酸化マグネシウム
、酸化セリウムおよび酸化カルシウムの少なくとも１種
が２．５〜４．０モル％となる如く水溶性ジルコニウム
化合物とイツトリウム、マグネシウム、セリウムおよび
カルシウムの少なくとも１種の水溶性金属塩とを加え、
次いでアルカリ或いは炭酸アルカリを添加して析出物を
生成せしめ、得られた析出物を濾過、水洗し、乾燥、焼
成する酸化ジルコニウム粉体の製造方法に於いて、アル
カリ或いは炭酸アルカリの添加時に析出物に対して１〜
１０重量部の水酸化ジルコニウムを種子として添加する
ことを特徴とする酸化ジルコニウム粉体の製造方法を提
供するにある。That is, the present invention provides a water-soluble zirconium compound such that the composition after firing is 2.5 to 4.0 mol % of at least one of yttrium oxide, magnesium oxide, cerium oxide, and calcium oxide based on zirconium oxide. and at least one water-soluble metal salt of yttrium, magnesium, cerium and calcium,
Next, in a method for producing zirconium oxide powder, in which an alkali or alkali carbonate is added to form a precipitate, the resulting precipitate is filtered, washed with water, dried, and calcined. 1 to
The present invention provides a method for producing zirconium oxide powder, characterized in that 10 parts by weight of zirconium hydroxide is added as seeds.
以下本発明方法を更に詳細に説明する。The method of the present invention will be explained in more detail below.
本発明の実施に際し使用される水溶性ジルコニウム化合
物としては、焼成後酸化ジルコニウムを形成するもので
あれば特にその種類は制限されないが、例えばオキシ塩
化ジルコニウム、硫酸ジルコニウムまたは塩基性炭酸ジ
ルコニウム或いはこれらの混合物等が挙げられる。The type of water-soluble zirconium compound used in carrying out the present invention is not particularly limited as long as it forms zirconium oxide after firing, but for example, zirconium oxychloride, zirconium sulfate, basic zirconium carbonate, or a mixture thereof. etc.
他方、水溶性金属塩としては焼成後酸化イツトリウム、
酸化マグネシウム、酸化セリウムおよび酸化力ルソウム
を形成するものであればよ（、イツトリウム、マグネシ
ウム、セリウムおよびカルシウムの塩化物、硝酸塩、硫
酸塩または酢酸塩およびアルカリ金属塩、更にはこれら
の混合物が使用される。On the other hand, as water-soluble metal salts, yttrium oxide after calcination,
chlorides, nitrates, sulphates or acetates and alkali metal salts of yttrium, magnesium, cerium and calcium, as well as mixtures thereof, may be used, provided that they form magnesium oxide, cerium oxide and russium oxide. Ru.
水溶性ジルコニウム化合物に対する水溶性金属塩の添加
混合割合は焼成後の形態として酸化ジルコニウムに対し
酸化物換算で２．５〜４．０モル％の範囲で用いられる
。酸化ジルコニウムに対する金属塩の添加混合割合が上
述の範囲を外れる場合には、この粉体を原料として得ら
れる焼結体の機械的強度が弱くなり適当ではない。The mixing ratio of the water-soluble metal salt to the water-soluble zirconium compound is in the range of 2.5 to 4.0 mol% in terms of oxide based on the zirconium oxide in the form after firing. If the mixing ratio of the metal salt to zirconium oxide is out of the above-mentioned range, the mechanical strength of the sintered body obtained using this powder as a raw material will be weakened, which is not appropriate.
所定量の水溶性ジルコニウム化合物に安定化剤としての
水溶性金属塩を加え、十分に攪拌混合した溶液には次い
で公知の方法に従い水酸化ナトリウム、水酸化カリウム
、水酸化アンモニウム等のアルカリ或いは炭酸ナトリウ
ム、炭酸水素ナトリウム、炭酸アンモニウム等の炭酸ア
ルカリ、および種子として析出が予定される水酸化ジル
コニウム重量の１〜１０重量％の水酸化ジルコニウムを
添加、攪拌して徐々に中和し、沈澱物を析出させる。A water-soluble metal salt as a stabilizer is added to a predetermined amount of a water-soluble zirconium compound, and the solution is thoroughly stirred and mixed. Then, according to a known method, an alkali such as sodium hydroxide, potassium hydroxide, ammonium hydroxide, or sodium carbonate is added. , alkali carbonates such as sodium hydrogen carbonate and ammonium carbonate, and 1 to 10% by weight of zirconium hydroxide based on the weight of zirconium hydroxide that is expected to be precipitated as seeds are added, stirred and gradually neutralized to precipitate. let
本発明方法の特徴ばかがる中和処理時、種子として析出
量に対し１〜１０重量％の水酸化ジルコニウムを添加存
在せしめる所にあり、これにより理由は詳らかではない
が種子無添加の場合には中和析出過程において特定のｐ
Ｈ域で無数の微小な水酸化ジルコニウム結晶が発生し、
この結晶が急速に三次元の網目構造を形成、その内部に
水を取り込むことにより急激な粘度上昇を生起するので
あるが、種子が存在する場合には該種子により微小な結
晶の発生が抑制され、中和析出速度が調整され、異常な
粘度上昇が防止し得るものであると推測される。The feature of the method of the present invention is that during the neutralization treatment, 1 to 10% by weight of zirconium hydroxide is added as seeds based on the amount of precipitated seeds. is a specific p in the neutralization precipitation process.
Countless tiny zirconium hydroxide crystals are generated in the H region,
These crystals rapidly form a three-dimensional network structure, which takes in water and causes a rapid increase in viscosity. However, if seeds are present, the seeds suppress the formation of microcrystals. It is presumed that the neutralization precipitation rate can be adjusted and an abnormal increase in viscosity can be prevented.
種子として添加する水酸化ジルコニウムの組成は所望と
する製品と同一組成のものであれば特にその製法は制限
されないが、好ましくは種子として添加する溶液と同一
の組成液から中和法により析出せしめた水酸化ジルコニ
ウムを用いるのが良い。The composition of the zirconium hydroxide added as seeds is not particularly limited as long as it has the same composition as the desired product, but it is preferably precipitated by a neutralization method from a solution with the same composition as the solution added as seeds. It is better to use zirconium hydroxide.
本発明方法の実施に際し、種子としての水酸化ジルコニ
ウムは予想される中和共沈量に対し１〜１０］ｉ量％の
範囲内で添加存在せしめる。添加する種子量が１重量％
未満では粘度急増に対する抑制効果が小さく、また１０
重量％を越える場合には添加量に見返る効果はなく、む
しろ経済上好ましくない。When carrying out the method of the present invention, zirconium hydroxide as seeds is added in an amount of 1 to 10]i% based on the expected amount of neutralized coprecipitate. The amount of seeds added is 1% by weight.
If it is less than 10, the effect of suppressing the rapid increase in viscosity is small;
If it exceeds % by weight, there will be no reciprocal effect on the amount added, and it is rather unfavorable from an economic standpoint.
中和処理時に於ける種子水酸化ジルコニウムの添加は中
和共沈せしめる液中に中和共沈開始前に分散させておく
方法、或いは中和用のアルカリ等の溶液中に予め分散さ
せておく方法等が挙げられるが、いずれの方法を適用し
てもよく、勿論これらの方法を組合せることも可能であ
る。When adding seed zirconium hydroxide during the neutralization process, it can be dispersed in the neutralization coprecipitation solution before the start of neutralization coprecipitation, or it can be dispersed in advance in an alkali solution for neutralization. Any method may be used, and it is of course possible to combine these methods.
かくして中和、沈澱析出させて得たジルコニウムの水酸
化物は公知方法により濾過し、溶液を分離した後水洗、
乾燥し、次いで６００〜１３００℃の温度で焼成される
。The zirconium hydroxide thus obtained by neutralization and precipitation is filtered by a known method, the solution is separated, and then washed with water.
It is dried and then fired at a temperature of 600-1300°C.
焼成温度が６００℃よりも低いと水酸化ジルコニウムが
完全に酸化ジルコニウム粉末に変換できず、他方１３０
０℃を越える場合には酸化ジルコニウム粉体の粒子が粗
大化するので好ましくない。If the firing temperature is lower than 600°C, zirconium hydroxide cannot be completely converted to zirconium oxide powder;
If the temperature exceeds 0°C, the particles of the zirconium oxide powder will become coarse, which is not preferable.
以上詳述した本発明方法によれば、従来公知の中和共沈
法による水酸化ジルコニウムの析出生成時に該中和処理
に供する水溶液中に水酸化ジルコニウムを種子として添
加するという極めて簡単な方法により安定化剤が均質に
分散した水酸化ジルコニウムを得ることができ、このこ
とにより均質な組成および結晶子を有する部分安定化酸
化ジルコニウムの取得を可能ならしめたものであり、そ
の工業的価値は頗る大なるものである。According to the method of the present invention described in detail above, zirconium hydroxide is added as seeds to the aqueous solution to be subjected to the neutralization treatment when zirconium hydroxide is precipitated by the conventionally known neutralization coprecipitation method. It is possible to obtain zirconium hydroxide in which the stabilizer is homogeneously dispersed, which makes it possible to obtain partially stabilized zirconium oxide having a homogeneous composition and crystallites, and its industrial value is significant. It is a big thing.
以下本発明方法を実施例により更に詳細に説明するが、
本発明はかかる実施例により制限されごものではない。The method of the present invention will be explained in more detail by examples below.
The present invention is not limited to these embodiments.
実施例
２０Ａのポリエチレン製容器中でオキシ塩化ジルコニウ
ム５００ｇ（Ｚｒ○２換算で）および塩化イツトリウム
５０ｇを純水１０１に溶解した後、これに上述と同一組
成のオキシ塩化ジルコニウムおよび塩化イツトリウムよ
りなる水溶液中より中和共沈法にて得た水酸化ジルコニ
ウム２５ｇを分散させた１０％アンモニア水（３１）を
１０ｃｃ／ｍｉｎの速度で添加した。この中和共沈時の
水溶液の粘度変化を第１図に示す。更に比較のため中和
用アンモニア水に種子としての水酸化ジルコニウムを添
加しない他は上記方法と全く同様に中和処理を行った。In the polyethylene container of Example 20A, 500 g of zirconium oxychloride (in terms of Zr○2) and 50 g of yttrium chloride were dissolved in 101 g of pure water, and then an aqueous solution of zirconium oxychloride and yttrium chloride having the same composition as above was dissolved. 10% ammonia water (31) in which 25 g of zirconium hydroxide obtained by the neutralization coprecipitation method was dispersed was added at a rate of 10 cc/min. Figure 1 shows the change in viscosity of the aqueous solution during this neutralized coprecipitation. Furthermore, for comparison, a neutralization treatment was carried out in exactly the same manner as in the above method except that zirconium hydroxide as seeds was not added to the ammonia water for neutralization.
この中和共沈時の水溶液の粘度変化も第１図に示す。FIG. 1 also shows the change in viscosity of the aqueous solution during this neutralized coprecipitation.
第１図より明らかな如く種子水酸化ジルコニウムを添加
存在せしめたアルカリ液で中和処理したものは種子を添
加分散させていないものに比較し、中和処理時の粘度上
昇が少ないことが分かる。As is clear from FIG. 1, it can be seen that the viscosity increase during the neutralization treatment is smaller when the seeds are neutralized with an alkaline solution containing zirconium hydroxide than when the seeds are not added and dispersed.
また上述の方法で析出した水酸化ジルコニウムを濾過、
水洗し、乾燥後１０００°Ｃの温度で２時間焼成後振動
ミルで２時間粉砕処理した。このようにして得られた酸
化ジルコニウム粉末は種子添加品の場合平均粒径０．６
μ、＋２μ以上の粒子１０重量％であり、無添加品の平
均粒径は０．７μで、＋２μ以上の粒子は２０重量％で
あった。In addition, zirconium hydroxide precipitated by the above method is filtered,
After washing with water and drying, it was baked at a temperature of 1000°C for 2 hours, and then pulverized in a vibrating mill for 2 hours. The zirconium oxide powder obtained in this way has an average particle size of 0.6 in the case of seed additives.
The average particle diameter of the additive-free product was 0.7 μ, and the amount of particles of +2 μ or more was 20% by weight.
このことより、本発明方法は安定化剤が均一にジルコニ
ア中、或いはその近傍に分散されているため粉体の組成
および結晶化が均質化され、粉体の局所的な凝集が少な
（なっているものと推察される。From this, it can be seen that in the method of the present invention, the stabilizer is uniformly dispersed in or near the zirconia, so the composition and crystallization of the powder are homogenized, and local aggregation of the powder is reduced. It is presumed that there are.
第１図は中和処理時に於いて安定化剤を分散させた水酸
化ジルコニウム析出反応系溶液の粘度変化を示すもので
あり、図中○は種子水酸化ジルコニウムを添加した場合
を、※は種子水酸化ジルコニウムを無添加の場合の例を
示す。
名 １ 図
０ ０．２ ０．４ ０，６ ０．８
１．０寸恥宍史枡関 （キ（、釡）Figure 1 shows the viscosity change of the zirconium hydroxide precipitation reaction system solution in which a stabilizer is dispersed during neutralization treatment. An example in which zirconium hydroxide is not added is shown. Name 1 Figure 0 0.2 0.4 0,6 0.8
1.0 inch shame Shishishi Masu Seki (ki (, kettle)
Claims (1)
し酸化イットリウム、酸化マグネシウム、酸化セリウム
および酸化カルシウムの少なくとも１種が２．５〜４．
０モル％となる如く水溶性ジルコニウム化合物とイット
リウム、マグネシウム、セリウムおよびカルシウムの少
なくとも１種の水溶性金属塩とを加え、次いでアルカリ
或いは炭酸アルカリを添加して析出物を生成せしめ、得
られた析出物を濾過、水洗し、乾燥、焼成する酸化ジル
コニウム粉体の製造方法に於いて、アルカリ或いは炭酸
アルカリの添加時に析出物に対して１〜１０重量部の水
酸化ジルコニウムを種子として添加することを特徴とす
る酸化ジルコニウム粉体の製造方法。 ２）種子としての水酸化ジルコニウムが種子を添加する
液と同一の組成液から析出せしめた水酸化ジルコニウム
である特許請求の範囲第１項記載の方法。[Claims] 1) The composition after firing is zirconium oxide and at least one of yttrium oxide, magnesium oxide, cerium oxide, and calcium oxide in a ratio of 2.5 to 4.
Add a water-soluble zirconium compound and at least one water-soluble metal salt of yttrium, magnesium, cerium, and calcium so that the concentration is 0 mol%, and then add an alkali or alkali carbonate to form a precipitate, and the resulting precipitate In the method for producing zirconium oxide powder in which the material is filtered, washed with water, dried, and fired, it is recommended to add 1 to 10 parts by weight of zirconium hydroxide as seeds to the precipitate when adding an alkali or alkali carbonate. Characteristic method for producing zirconium oxide powder. 2) The method according to claim 1, wherein the zirconium hydroxide used as the seeds is zirconium hydroxide precipitated from a solution having the same composition as the solution to which the seeds are added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59205950A JPH0635329B2 (en) | 1984-10-01 | 1984-10-01 | Method for producing zirconium oxide powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59205950A JPH0635329B2 (en) | 1984-10-01 | 1984-10-01 | Method for producing zirconium oxide powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6183627A true JPS6183627A (en) | 1986-04-28 |
| JPH0635329B2 JPH0635329B2 (en) | 1994-05-11 |
Family
ID=16515388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59205950A Expired - Lifetime JPH0635329B2 (en) | 1984-10-01 | 1984-10-01 | Method for producing zirconium oxide powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0635329B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772576A (en) * | 1985-09-06 | 1988-09-20 | Nippon Soda Co., Ltd. | High density alumina zirconia ceramics and a process for production thereof |
| US4778671A (en) * | 1986-07-14 | 1988-10-18 | Corning Glass Works | Preparation of unagglomerated metal oxide particles with uniform particle size |
| FR2701471A1 (en) * | 1993-02-10 | 1994-08-19 | Rhone Poulenc Chimie | Process for the synthesis of compositions based on mixed oxides of zirconium and cerium, compositions thus obtained and uses thereof. |
| AU692207B2 (en) * | 1993-12-24 | 1998-06-04 | Rhone-Poulenc Chimie | Composition precursor and cerium and zirconium mixed oxide based composition, method for its preparation and use thereof |
| CN115340126A (en) * | 2022-09-15 | 2022-11-15 | 包头稀土研究院 | Rare earth zirconate particles and method for making same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60215527A (en) * | 1984-04-06 | 1985-10-28 | Onoda Cement Co Ltd | Production of zirconium oxide fine powder |
-
1984
- 1984-10-01 JP JP59205950A patent/JPH0635329B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60215527A (en) * | 1984-04-06 | 1985-10-28 | Onoda Cement Co Ltd | Production of zirconium oxide fine powder |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772576A (en) * | 1985-09-06 | 1988-09-20 | Nippon Soda Co., Ltd. | High density alumina zirconia ceramics and a process for production thereof |
| US4778671A (en) * | 1986-07-14 | 1988-10-18 | Corning Glass Works | Preparation of unagglomerated metal oxide particles with uniform particle size |
| FR2701471A1 (en) * | 1993-02-10 | 1994-08-19 | Rhone Poulenc Chimie | Process for the synthesis of compositions based on mixed oxides of zirconium and cerium, compositions thus obtained and uses thereof. |
| EP0614854A1 (en) * | 1993-02-10 | 1994-09-14 | Rhone-Poulenc Chimie | Process for the synthesis of mixed zirconium und cerium oxides based compositions, the obtained compositions and use thereof |
| US5607892A (en) * | 1993-02-10 | 1997-03-04 | Rhone-Poulenc Chimie | Zirconium/cerium mixed oxide catalyst/catalyst support compositions having high/stable specific surfaces |
| US5626826A (en) * | 1993-02-10 | 1997-05-06 | Rhone-Poulenc Chimie | Zirconium/cerium mixed oxide catalyst/catalyst support compositions having high/stable specific surfaces |
| EP0930271A3 (en) * | 1993-02-10 | 1999-07-28 | Rhodia Chimie | Compositions based on mixed oxides of zirconium and cerium and use of these compositions |
| AU692207B2 (en) * | 1993-12-24 | 1998-06-04 | Rhone-Poulenc Chimie | Composition precursor and cerium and zirconium mixed oxide based composition, method for its preparation and use thereof |
| CN115340126A (en) * | 2022-09-15 | 2022-11-15 | 包头稀土研究院 | Rare earth zirconate particles and method for making same |
| CN115340126B (en) * | 2022-09-15 | 2024-04-12 | 包头稀土研究院 | Rare earth zirconate particles and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0635329B2 (en) | 1994-05-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0828690B1 (en) | Spheroidally agglomerated basic cobalt (ii) carbonate and spheroidally agglomerated cobalt (ii) hydroxide, process for their production and their use | |
| JPH0455315A (en) | Production of cerium oxide fine powder | |
| JPS6183627A (en) | Production of powdery zirconium oxide | |
| JPH08268716A (en) | Method for controlling particle diameter of pseudo-boehmite powder | |
| JPH0323220A (en) | Preparation of white electrically- conductive zinc oxide | |
| JPH0346407B2 (en) | ||
| US5312613A (en) | Process for producing ceramic precursor powders without gel formation | |
| JPH0238527B2 (en) | ||
| US3024088A (en) | Making micro-porous, discrete, few micron size oxide compounds of metals, and the products | |
| US3230043A (en) | Manufacture of lead oxide hydroxide | |
| JPS623004A (en) | Production of easily sintering perovskite raw material powder by wet method | |
| JPS638220A (en) | Production of zirconium oxide powder | |
| JPH0527571B2 (en) | ||
| JPH0624743A (en) | Production of spherical zinc oxide powder | |
| JP3681550B2 (en) | Rare earth oxide and method for producing the same | |
| JP2001294424A (en) | Method for manufacturing sodium titanate | |
| JPS63222014A (en) | Production of oxide fine powder of perovskite type | |
| JP3257094B2 (en) | Method for producing zirconia powder | |
| JP3208768B2 (en) | Method for producing hydrated zirconia sol | |
| JPS62212224A (en) | Production of zirconia solid solution crystal fine powder | |
| JPH06171944A (en) | Production of zirconium oxide powder | |
| JPH0193404A (en) | Production of raw material powder of compound having garnet structure | |
| JPS6086024A (en) | Production of titanic acid salt | |
| JP2724695B2 (en) | Method for producing potassium titanate whisker | |
| JP3237140B2 (en) | Method for producing hydrated zirconia sol and zirconia powder |