JPH01126285A - Zirconia coated ceramic tool - Google Patents
Zirconia coated ceramic toolInfo
- Publication number
- JPH01126285A JPH01126285A JP28381787A JP28381787A JPH01126285A JP H01126285 A JPH01126285 A JP H01126285A JP 28381787 A JP28381787 A JP 28381787A JP 28381787 A JP28381787 A JP 28381787A JP H01126285 A JPH01126285 A JP H01126285A
- Authority
- JP
- Japan
- Prior art keywords
- zirconia
- stabilized zirconia
- coating layer
- yttria
- ceramic tool
- 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
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 239000000919 ceramic Substances 0.000 title abstract 5
- 239000011247 coating layer Substances 0.000 claims abstract description 21
- 229910002076 stabilized zirconia Inorganic materials 0.000 claims abstract description 18
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910001233 yttria-stabilized zirconia Inorganic materials 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 238000001354 calcination Methods 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 230000007704 transition Effects 0.000 description 8
- 229910002084 calcia-stabilized zirconia Inorganic materials 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 239000006104 solid solution Substances 0.000 description 5
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 4
- 229910052863 mullite Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000010304 firing Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
- C04B41/5042—Zirconium oxides or zirconates; Hafnium oxides or hafnates
Abstract
Description
【発明の詳細な説明】
［発明の１−１的］
（産業上の利用分野）
本発明は、本体にジルコニア又は安定化ジルコニアを主
体とするコーティング層を設けたジルコニアコーティン
グ窯道具に関する。DETAILED DESCRIPTION OF THE INVENTION [Object 1-1 of the Invention] (Industrial Application Field) The present invention relates to a zirconia-coated kiln tool whose main body is provided with a coating layer mainly composed of zirconia or stabilized zirconia.
（従来の技術）
例えばフェライト或はセラミックコンデンサ等を焼成す
るための匣鉢等の窯道具は、一般に、ムライト質耐火物
から構成されている。この窯道具を使用する際には、従
来、焼成時に被焼成品との間で反応が生ずることを抑え
るためにジルコニアを主体とする耐火物製の敷板（一般
にはセッターと称する）を配置し、このセッターの上に
被焼成品を載置するようにしていた。しかし、このよう
なセッターを逐−匣鉢内に収納する作業は相当に面倒で
あり、ひいては窯詰め・焼成工程の自動化も困難になる
という問題があった。(Prior Art) For example, kiln tools such as saggers for firing ferrite or ceramic capacitors are generally made of mullite refractories. When using this kiln tool, conventionally, a refractory plate made of zirconia (generally called a setter) is placed in order to prevent a reaction from occurring with the product being fired during firing. The product to be fired was placed on this setter. However, the task of storing such setters one by one in a sagger pot is quite troublesome, and there is a problem in that it becomes difficult to automate the kiln filling and firing process.
そこで、近年は、窯道具の表面にジルコニアをコーティ
ングして予め焼成するジルコニアコーティング窯道具が
考えられている。これによれば、セッターを配置する等
の準備作業が不要になって工程の簡素化を図り得るから
である。Therefore, in recent years, zirconia-coated kiln tools have been developed in which the surface of the kiln tool is coated with zirconia and fired in advance. According to this, preparatory work such as arranging a setter becomes unnecessary, and the process can be simplified.
しかしながら、周知のように、ジルコニアは１０００℃
近辺で相転移を起すため、加熱・冷却が繰返されると相
転移に伴う膨張に起因してコーティング層内に応力が発
生し、これがためにコーティング層が本体から盛り上が
るようにして剥離してしまうという欠点があった。この
ような相転移に伴う剥離現象を抑制するには、熱サイク
ルにより相転移を生じさせない安定化ジルコニア、中テ
も最も一般的でコスト的にも有利なカルシア安定化ジル
コニアを使用することが考えられる。However, as is well known, zirconia is heated to 1000℃
Since a phase transition occurs in the vicinity, when heating and cooling are repeated, stress is generated within the coating layer due to expansion due to the phase transition, which causes the coating layer to bulge from the main body and peel off. There were drawbacks. In order to suppress the peeling phenomenon associated with such a phase transition, it is considered to use stabilized zirconia, which does not undergo phase transition due to thermal cycles, and calcia-stabilized zirconia, which is the most common and cost-effective material. It will be done.
（発明が解決しようとする問題点）
しかしながら、このようにカルシア安定化ジルコニアを
主体とするコーティング層を窯道具の本体に設けても、
繰返し使用すると、起り得ない筈の相転移による膨脹に
よってコーティング層が本体から剥離してしまうという
現象が生じ、十分な繰返し使用に耐えることができない
ものであった。(Problems to be Solved by the Invention) However, even if a coating layer mainly composed of calcia-stabilized zirconia is provided on the main body of the kiln tool,
When used repeatedly, a phenomenon occurs in which the coating layer peels off from the main body due to expansion due to phase transition, which should not occur, and the product cannot withstand sufficient repeated use.
そこで、本発明者らは、繰返し使用してもコーティング
層の剥離を防止することができるジルコニアコーティン
グ窯道具の開発を目的として上述の現象につき精査し、
遂に本発明を完成させるに至ったものである。Therefore, the present inventors carefully investigated the above-mentioned phenomenon with the aim of developing a zirconia-coated kiln tool that can prevent the coating layer from peeling off even after repeated use.
The present invention has finally been completed.
［発明の構成コ
（問題点を解決するための手段）
本発明に係るジルコニアコーティング窯道具は、窯道具
本体にジルコニアまたは安定化ジルコニアを主体とする
コーティング層を設けたものであって、そのコーティン
グ層にイツトリア安定化ジルコニアを含有させ、イツト
リアの含有率を０．０８％以１−としたところに特徴を
有するものである。[Structure of the Invention (Means for Solving Problems) The zirconia-coated kiln tool according to the present invention has a coating layer mainly composed of zirconia or stabilized zirconia on the main body of the kiln tool, and the coating layer is made of zirconia or stabilized zirconia. It is characterized in that the layer contains yttria-stabilized zirconia, and the yttria content is 0.08% or more.
（作用）
安定化ジルコニアは、本来、熱サイクルを作用させても
相転移に起因する膨脹が生じない筈である。しかし、窯
道具本体にこれをコーティングして熱サイクルを繰返し
作用させると、相転移を生じさせるに至る。この原因は
、特にコーティング層における本体側の結晶成分とその
反対側の結晶成分とをＸ線回折を利用して同定すること
によって得られた本発明者らの知見によれば、カルシア
安定化ジルコニア中に固溶しているＣａＯが窯道具本体
の５ｉ０２の存在により脱固溶し、これがために安定化
ジルコニアが非安定化ジルコニアに戻ってしまうためで
あると考えられる。そこで、本発明者らはＣａＯ安定化
ジルコニアに比べて数倍量−１−も高価であるために従
来全く顧みられなかったイツトリア安定化ジルコニアに
石ＬＩ Ｌ、１−把手段を完成させたのである。(Function) Stabilized zirconia is originally not supposed to undergo expansion due to phase transition even when subjected to thermal cycles. However, when a kiln tool body is coated with this and subjected to repeated thermal cycles, a phase transition occurs. According to the inventors' findings obtained by identifying the crystalline component on the main body side and the crystalline component on the opposite side of the coating layer using X-ray diffraction, the reason for this is that the calcia-stabilized zirconia This is thought to be because CaO dissolved in solid solution is removed from solid solution due to the presence of 5i02 in the main body of the kiln tool, and as a result, stabilized zirconia returns to non-stabilized zirconia. Therefore, the present inventors have completed a stone gripping means for itria-stabilized zirconia, which has not been considered at all because it is several times more expensive than CaO-stabilized zirconia. be.
イツトリア安定化ジルコニア中に固溶せるＹ２Ｏ３は窯
道具本体に５ｉ０２が存在していても脱固溶しない。従
って、イツトリア安定化ジルコニアは熱サイクルを繰返
し受けても安定化状態を維持し、長期間にわたりコーテ
ィング層内にジルコニアの相転移に起因する応力が発生
することがなく、コーティング層の剥離を防１１−シて
耐用度を向１−させることができる。Y2O3, which can be solid-dissolved in yttoria-stabilized zirconia, does not dissolve into solid-dissolution even if 5i02 is present in the kiln tool body. Therefore, itria-stabilized zirconia maintains a stable state even when subjected to repeated thermal cycles, and stress caused by phase transition of zirconia does not occur in the coating layer over a long period of time, preventing peeling of the coating layer. - It is possible to improve the durability.
ここで、イツトリアの含有率を０．０８％以上としたの
は、０．０８％に満たないときには十分な耐用度が得ら
れないからである。必要とされる耐用度により異なるが
、一般にはその好ましい含有率は０．２％以上であり、
中でも１．０％以上の含有率が最も好ましい。また、イ
ツトリアの含有率は多い程耐用度を向上させ、その上限
は主として経済上の理由によってのみ制限される。更に
、窯道具本体の材質としては、５ｉ０２を含有せるもの
に対して特に有効であるが、必ずしもムライト質耐火物
に限らず、炭化珪素や窒化珪素系の耐火物製の窯道具本
体に対しても有効である。これらの表面には５ｉ０２被
膜が生成しているのが一般的だからである。Here, the reason why the content of ittria is set to 0.08% or more is that sufficient durability cannot be obtained when the content is less than 0.08%. Although it varies depending on the required durability, generally the preferred content is 0.2% or more,
Among these, a content of 1.0% or more is most preferable. Further, the higher the content of ittria, the higher the durability, and its upper limit is limited mainly only by economic reasons. Furthermore, as for the material of the kiln tool body, it is particularly effective for those containing 5i02, but it is not necessarily limited to mullite refractories, but it is also effective for kiln tool bodies made of silicon carbide and silicon nitride refractories. is also valid. This is because a 5i02 film is generally formed on these surfaces.
（実施例） 以下本発明のいくつかの実施例を比較例と共に述べる。(Example) Some examples of the present invention will be described below along with comparative examples.
比較例１はカルシア安定化ジルコニアのみを原料とし、
次表に示すように、粒度が１００μｍ〜４３μｍのもの
を８０％、４３μｍ以下のものを２０ （）６含む。一
方、比較例２及び実施例１〜６は、１−述のカルシア安
定化ジルコニアの他に粒度が４３μｍ以下のイツトリア
安定化ジルコニアを含む。Comparative Example 1 uses only calcia-stabilized zirconia as a raw material,
As shown in the following table, 80% of the particles have a particle size of 100 μm to 43 μm, and 20% have a particle size of 43 μm or less. On the other hand, Comparative Example 2 and Examples 1 to 6 contain itria-stabilized zirconia having a particle size of 43 μm or less in addition to the calcia-stabilized zirconia described in 1-.
このイツトリア安定化ジルコニアは、ジルコニアに１０
％のイツトリアを固溶させたものである。This yttria-stabilized zirconia has 10
% of Ittria is dissolved in solid solution.
これらの各原料は次表に示す割合で配合され、これにＣ
Ｍｏ ３％及び水分２０％を添加してミキサーで攪拌し
たものを１００ｍｍＸ １００ｍｍＸ １０ｆｆｉｎの
ムライト質耐火物に０．５Ｉ＋＋＋ｓの厚さに塗布して
乾燥させ、その後、１２００〜１３００℃にて焼成した
。これにてムライト質耐火物の本体表面に安定化ジルコ
ニアを主体とするコーティング層が形成され、そのコー
ティング層のイツトリア含有゛率は次表に示す通りとな
る。These raw materials are mixed in the proportions shown in the table below, and C
3% Mo and 20% water were added and stirred with a mixer, and the mixture was applied to a 100 mm x 100 mm x 10 ffin mullite refractory to a thickness of 0.5 I+++s, dried, and then fired at 1200 to 1300°C. As a result, a coating layer mainly composed of stabilized zirconia is formed on the main body surface of the mullite refractory, and the itria content of the coating layer is as shown in the following table.
１：表において剥離評価は、窯内に繰返し収納してコー
ティング層の剥離が生ずるまでの耐用回数に基づきなさ
れており、Ｘ印は５回未満、Δ印は５〜９回、○印は１
０〜１９回、◎印は２０回以上の耐用回数であったこと
を示す。上表からも明らかなように、イツトリアを含ま
ない比較例１及びイツトリアの含有率が０．０５％であ
る比較例２では、耐用回数が５回未満に１１−まるのに
対し、イツトリアを０．０８％以１−角何せる実施例１
〜６では実用］二評価するに足る５同量」二の耐用回数
を得ることができ、特に１％以上含有せる実施例５．６
では実に２０回以上の耐用回数が得られた。1: Peeling evaluation in the table is based on the number of times the coating layer can be stored repeatedly in the kiln until it peels off.
0 to 19 times, ◎ indicates that the durability was 20 times or more. As is clear from the above table, in Comparative Example 1 which does not contain Ittria and Comparative Example 2 which contains Ittria at a content rate of 0.05%, the service life is less than 5 times. Example 1 of increasing 1-angle by .08% or more
Example 5.6 in which it is possible to obtain a service life of 1% or more in practical use]
In fact, it could be used more than 20 times.
また、各実施例１〜６では、コーティング層の焼結性に
優れ、表面のボロつきも従来に比べて著しく減少した。Moreover, in each of Examples 1 to 6, the coating layer had excellent sinterability, and surface roughness was significantly reduced compared to the conventional one.
このように本発明によれば、（１かの量のイツトリア安
定化ジルコニアを添加するだけでコーティング層の膨張
を長期にわたり抑えることができるから、カルシア安定
化ジルコニアに比べてイツトリア安定化ジルコニアが数
倍も高価であるという“１【情があっても、コスト−１
−昇をほとんど招くことなく耐用度を大幅に高めること
ができる。尚、コーティング層の主体は−１−記名実施
例に示したようにカルシア安定化ジルコニアでなくとも
、未安定化ジルコニアであってもよく、特に微粉部にイ
ツトリア安定化ジルコニアを添加することが最も効用的
である。As described above, according to the present invention, it is possible to suppress the expansion of the coating layer for a long period of time by simply adding one amount of ittria-stabilized zirconia. “1 [Even if you have compassion, the cost - 1]
- Durability can be significantly increased with almost no increase. Note that the main body of the coating layer does not have to be calcia-stabilized zirconia as shown in -1-Registered Example, but may be unstabilized zirconia. In particular, it is most preferable to add ittria-stabilized zirconia to the fine powder part. It is useful.
［発明の効果］
本発明は以上述べたように、カルシア安定化ジルコニア
が８１０２の存在に起因して脱固溶することの知見に基
づき、斯かる脱固溶のないイツトリア安定化ジルコニア
を添加するようにしたものであり、これにてジルコニア
の安定化状態を確実に維持させることができて耐用度を
大幅に高めることができるジルコニアコーティング窯道
具を提供することができる。[Effects of the Invention] As described above, the present invention is based on the knowledge that calcia-stabilized zirconia undergoes solid solution removal due to the presence of 8102, and adds itria-stabilized zirconia that does not undergo such removal of solid solution. This makes it possible to provide a zirconia-coated kiln tool that can reliably maintain the stabilized state of zirconia and greatly increase its durability.
Claims (1)
主体とするコーティング層を設けたものであって、その
コーティング層にイットリア安定化ジルコニアを含有さ
せ、イットリアの含有率を０．０８％以上としたことを
特徴とするジルコニアコーティング窯道具。1. A coating layer mainly composed of zirconia or stabilized zirconia is provided on the main body of the kiln tool, and the coating layer contains yttria-stabilized zirconia, and the yttria content is 0.08% or more. Zirconia coated kiln tools featuring
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28381787A JPH01126285A (en) | 1987-11-10 | 1987-11-10 | Zirconia coated ceramic tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28381787A JPH01126285A (en) | 1987-11-10 | 1987-11-10 | Zirconia coated ceramic tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01126285A true JPH01126285A (en) | 1989-05-18 |
| JPH0524878B2 JPH0524878B2 (en) | 1993-04-09 |
Family
ID=17670535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28381787A Granted JPH01126285A (en) | 1987-11-10 | 1987-11-10 | Zirconia coated ceramic tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01126285A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03223193A (en) * | 1990-01-25 | 1991-10-02 | Ngk Insulators Ltd | Refractory material having stabilized zirconia-coated layer and its production |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57179072A (en) * | 1981-04-27 | 1982-11-04 | Toyoda Chuo Kenkyusho Kk | Manufacture of zirconia sintered body |
| JPS59121165A (en) * | 1982-12-25 | 1984-07-13 | 京セラ株式会社 | Manufacture of zirconia black dressing member |
| JPS6124225A (en) * | 1984-07-13 | 1986-02-01 | 九州耐火煉瓦株式会社 | Method of producing jig for electronic part baking |
| JPS6126562A (en) * | 1984-07-18 | 1986-02-05 | 東ソー株式会社 | Zirconia sintered body |
| JPS6158858A (en) * | 1984-08-29 | 1986-03-26 | 株式会社クボタ | Manufacture of alumina ceramic sintered body |
| JPS61174385A (en) * | 1984-09-10 | 1986-08-06 | Hitachi Ltd | Ceramic-coated fire resistant member and its production |
| JPS6272582A (en) * | 1985-09-26 | 1987-04-03 | 日本碍子株式会社 | Zirconia-coated silicon nitride sintered member |
| JPS62122841U (en) * | 1986-01-27 | 1987-08-04 |
-
1987
- 1987-11-10 JP JP28381787A patent/JPH01126285A/en active Granted
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57179072A (en) * | 1981-04-27 | 1982-11-04 | Toyoda Chuo Kenkyusho Kk | Manufacture of zirconia sintered body |
| JPS59121165A (en) * | 1982-12-25 | 1984-07-13 | 京セラ株式会社 | Manufacture of zirconia black dressing member |
| JPS6124225A (en) * | 1984-07-13 | 1986-02-01 | 九州耐火煉瓦株式会社 | Method of producing jig for electronic part baking |
| JPS6126562A (en) * | 1984-07-18 | 1986-02-05 | 東ソー株式会社 | Zirconia sintered body |
| JPS6158858A (en) * | 1984-08-29 | 1986-03-26 | 株式会社クボタ | Manufacture of alumina ceramic sintered body |
| JPS61174385A (en) * | 1984-09-10 | 1986-08-06 | Hitachi Ltd | Ceramic-coated fire resistant member and its production |
| JPS6272582A (en) * | 1985-09-26 | 1987-04-03 | 日本碍子株式会社 | Zirconia-coated silicon nitride sintered member |
| JPS62122841U (en) * | 1986-01-27 | 1987-08-04 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03223193A (en) * | 1990-01-25 | 1991-10-02 | Ngk Insulators Ltd | Refractory material having stabilized zirconia-coated layer and its production |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0524878B2 (en) | 1993-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TW200938509A (en) | Aluminum compound-bonded brick for furnace hearth | |
| JP4456563B2 (en) | Chrome-free amorphous refractory for waste melting furnace and waste melting furnace lined with this | |
| EP2792656B1 (en) | Method for producing a silicon carbide whisker-reinforced refractory ceramic composition | |
| JPH01126285A (en) | Zirconia coated ceramic tool | |
| JP2874831B2 (en) | Refractory for pouring | |
| US8986598B2 (en) | Alumina-coated spinel-silicon carbide refractory composition with high corrosion resistance to coal slag and method for manufacturing the same | |
| JP2000178074A (en) | Castable refractory for blast furnace tapping spout | |
| JP4960541B2 (en) | Magnesia-alumina-titania brick | |
| JP2016179482A (en) | High-temperature container manufacturing method | |
| JP2003020292A (en) | Tool material for burning | |
| JPH09142916A (en) | Spinel-containing refractory | |
| JP2951432B2 (en) | Unfired refractory containing magnesia | |
| JP2005170729A (en) | Container for firing | |
| JP7202245B2 (en) | Brick lining for calcium phosphate firing furnace | |
| JP2009227508A (en) | Monolithic refractory and waste material melting furnace | |
| JPS6077162A (en) | Sliding nozzle plate | |
| JP3429551B2 (en) | Setter | |
| JP3131066B2 (en) | Jig for firing ceramic products | |
| JP2004059390A (en) | Castable refractory for blast furnace trough | |
| JP3207011B2 (en) | Refractories for firing ceramic products | |
| JP3510642B2 (en) | Magnesia clinker and manufacturing method thereof | |
| JP2000247752A (en) | Jig for baking electronic part with suppressed reaction and peeling | |
| JP2016069219A (en) | Alumina-magnesia casting material | |
| JPH0354162A (en) | Refractory | |
| JPS6081058A (en) | Magnesia baked refractories |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080409 Year of fee payment: 15 |