JPS61270255A - Thermal shock resistant ceramic - Google Patents
Thermal shock resistant ceramicInfo
- Publication number
- JPS61270255A JPS61270255A JP60113612A JP11361285A JPS61270255A JP S61270255 A JPS61270255 A JP S61270255A JP 60113612 A JP60113612 A JP 60113612A JP 11361285 A JP11361285 A JP 11361285A JP S61270255 A JPS61270255 A JP S61270255A
- Authority
- JP
- Japan
- Prior art keywords
- thermal shock
- weight
- ceramics
- resistant ceramic
- alumina
- 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
- 239000000919 ceramic Substances 0.000 title claims description 35
- 230000035939 shock Effects 0.000 title claims description 22
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 19
- 239000003513 alkali Substances 0.000 claims description 15
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 239000005350 fused silica glass Substances 0.000 claims description 11
- 238000010304 firing Methods 0.000 claims description 10
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims description 6
- 230000000052 comparative effect Effects 0.000 description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 230000000704 physical effect Effects 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 229910052878 cordierite Inorganic materials 0.000 description 4
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 4
- 239000004014 plasticizer Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical group [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 235000011187 glycerol Nutrition 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Chemical group 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Chemical group 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- 229910000505 Al2TiO5 Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 150000001340 alkali metals Chemical group 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 235000010981 methylcellulose Nutrition 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 description 1
- 235000004347 Perilla Nutrition 0.000 description 1
- 244000124853 Perilla frutescens Species 0.000 description 1
- 239000004264 Petrolatum Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229940066842 petrolatum Drugs 0.000 description 1
- 235000019271 petrolatum Nutrition 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Catalysts (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、熱膨張係数が小で、耐熱衝撃性に優れるセラ
ミックスの提供可能な組成物に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a composition capable of providing ceramics having a small coefficient of thermal expansion and excellent thermal shock resistance.
従来の技術
従来の熱膨張係数の小さな耐熱衝撃性に優れたセラミッ
ク組成物としては、コーディエライトセラミックス、リ
チア系セラミックス、チタン酸アルミニウムセラミック
ス等が一般的であシ、最もよく使用されている。コーデ
ィエライトセラミックスとは、ＭｇＯ−ム１２０．−８
ｉＯ□系からなるセラミックスである。コーディエライ
トは、タルク（Ｍｇｓ （Ｓｉｎ Ｏｌｏ ） （ＯＨ
）２ ）とカオリン（ム１２Ｓｉ２０５（ＯＨ）４）、
およびアルミナ（ム１２０３）を任意の比率で調合し、
混合、脱水、成形、乾燥、焼結して製造される。ちなみ
に焼結温度は、約１４００’Ｃで４〜５日間である（特
公昭６４−１６６４号公報、特公昭５１−２０３５８号
公報）また、チタン酸アルミニウムセラミックスとは、
酸化チタン（アナターゼ型）と純度のよいα−ムｅ２０
３を原料として、等セル調合物を１６００〜１７００’
Ｃで焼成して製造される（窯業工学ハンドブック Ｐ、
１２７４）。2. Description of the Related Art Conventional ceramic compositions having a small coefficient of thermal expansion and excellent thermal shock resistance include cordierite ceramics, lithium ceramics, and aluminum titanate ceramics, which are most commonly used. Cordierite ceramics is MgO-me 120. -8
It is a ceramic made of iO□ system. Cordierite is talc (Mgs (Sin Olo) (OH
)2) and kaolin (Mu12Si205(OH)4),
and alumina (Mu1203) in any ratio,
Manufactured by mixing, dehydrating, molding, drying, and sintering. By the way, the sintering temperature is about 1400'C for 4 to 5 days (Japanese Patent Publication No. 1664/1982, Japanese Patent Publication No. 20358/1983).Aluminum titanate ceramics are
Titanium oxide (anatase type) and α-mu e20 with good purity
3 as a raw material, the isocellular formulation was prepared from 1600 to 1700'
Manufactured by firing with C (Ceramic Engineering Handbook P.
1274).
発明が解決しようとする問題点
このような従来耐熱衝撃性セラミックスでは、高温焼結
を不可決としており、また合成されたセラミックスから
は緻密な焼結体が得られなかったり、構成結晶の熱膨張
の大きな異方性によってできる粒界の亀裂等より、耐熱
衝撃性に問題を有していた。本発明はかかる点に鑑みて
なされたもので、１１００〜１３００’（：と比較的低
い■焼温度で耐熱衝撃性セラミックスを提供することを
目的としている。Problems to be Solved by the Invention Conventional thermal shock resistant ceramics do not require high-temperature sintering, and the synthesized ceramics may not yield a dense sintered body, or the thermal expansion of the constituent crystals may There were problems with thermal shock resistance due to grain boundary cracks caused by large anisotropy. The present invention has been made in view of this point, and an object of the present invention is to provide thermal shock resistant ceramics at a relatively low firing temperature of 1100 to 1300'.
問題点を解決するための手段
本発明は上記問題点を解決するため、少なくとも再水和
性アルミナとチタン酸アルカリ塩および溶融シリカの三
成分を少なくとも必須成分としてなる組成物を■焼して
得たセラミックスである。Means for Solving the Problems In order to solve the above problems, the present invention provides a composition obtained by baking a composition comprising at least three essential components: rehydratable alumina, alkali titanate, and fused silica. It is made of ceramics.
作用
本発明は上記の構成よりなり、本発明において必須成分
である再水和性アルミナとは、アルミナ水和物を熱分解
したα−ム１２０．以外の遷移アルミナ、例えば、ρ−
ム１２ｏ３および無定形アルミナ等であり、工業的には
例えばバイヤ一工程から得られるアルミナ水和物等のア
ルミナ水和物を約４００〜１２００’Ｃの熱ガスに通常
数分の１〜１０秒間接触させたり、あるいはアルミナ水
和物を減圧下で約２５０〜９００°Ｃに通常１分〜４時
間加熱保持することにより得ることができる約Ｏ，Ｓ〜
１６重量％の灼熱減量を有するもの等が挙げられる。Function The present invention has the above configuration, and the rehydratable alumina which is an essential component in the present invention is α-am 120. Transition alumina other than, e.g. ρ−
12o3 and amorphous alumina, etc., and industrially, for example, alumina hydrate such as alumina hydrate obtained from Bayer 1 process is heated to a hot gas of about 400 to 1200'C for usually a fraction of a second to 10 seconds. About O, S, which can be obtained by contacting or heating and holding alumina hydrate at about 250 to 900°C under reduced pressure, usually for 1 minute to 4 hours.
Examples include those having a loss on ignition of 16% by weight.
次にチタン酸アルカリ塩とは、一般式Ｍ′２０・ｎＴｉ
ｏ２（式中Ｍ′は、リチウム、ナトリウム、カリウム、
／Ｉ／ビジウム、セシウム、バリウム、ストロンチウム
、カルシウムから選ばれるアルカリ金属原子を表わし、
ｎは１以上の整数である）で示される物質である。Next, the alkali titanate salt has the general formula M'20・nTi
o2 (in the formula, M' is lithium, sodium, potassium,
/I/ represents an alkali metal atom selected from vidium, cesium, barium, strontium, and calcium,
n is an integer of 1 or more).
次にもう一つの必須成分である溶融シリカについて記述
する。溶融シリカは、熱膨張係数が０．５Ｘ １０−６
／ｄｅｇ （常温〜１ｏｏｏ°Ｃ）と物質中もっとも小
さく、熱膨張を低減させる材料として一般的に知られて
いる。しかしながら溶融シリカはガラス形成酸化物でも
あり、他の物質（例えば、ナトリウム、カリウム、カル
シウム等のアルカリ成分およびアルミナ、チタニア等）
との混合物で、１０００′Ｃ以上の温度で熱処理される
と、クリストバライト、あるいはトリシマナイト等の結
晶物を生成させ、熱膨張係数も４〜５ Ｘ １０−’／
ｄｅｇ（常温〜１ｏ００°Ｃ）と激増させ、この点から
、従来、耐熱衝撃性耐火物としては使用に供されなかっ
たが、上記少なくとも三成分からなる組成物を１１ｏｏ
〜１２５０’Ｃの範囲で■焼することにより、その理由
は明らかでないが、耐熱衝撃性に優れたセラミックスが
得られた。虐ミ駈は；−前記、再水和性アルミナ、チタ
ン酸アルカリ塩、溶融シリカの他、成形助剤（たとえば
、ＣＭＣ，ＭＯ等）および可塑剤（グリセリン、ワセリ
ン）等を任意回水利性アルミナ１０重量％、チタン酸カ
リウム（Ｋ２Ｏ・５’Ｉ’ｉ、ｏ２） ５重量％、溶融
シリカ８５重量％、さらに成形助剤としてメチルセルロ
ース４．０重量部訃よび可塑剤としてグリセリン２．０
重量部、さらに水３０重量部加えた混合物をスクリュー
ニーダを用い１０分間混練後スクリュー型押し出し成形
機に供給し、ｄ １ｏ０％で長さ１００２で、壁厚０．
３ ％ 、−辺１．６ｚの正方形セルからなるハニカム
成形体を成形した。次いでこの成形体を１００°Ｃ／時
間の昇温速度で１２００′Ｃまで昇温し、更に１２００
’Ｏで１時間■焼した。このようにして得られたハニカ
ム構造体の物性を第１表に示す。また比較のため、再水
和性ア゛ルミナの代りにα−ム１２０３粉末を使用した
比較個人、チタン酸カリウムの代シに酸化チタン（アナ
ターゼ型ＴｉＯ□）を使用した比較例Ｂ、溶融シリカの
代りにコーディエライト粉末を使用した比較例Ｃを前記
実施例と同様にしてハニカム状セラミックスを製造した
。この時の物性も第１表に示す。Next, another essential component, fused silica, will be described. Fused silica has a thermal expansion coefficient of 0.5X 10-6
/deg (room temperature to 100°C), which is the smallest among substances, and is generally known as a material that reduces thermal expansion. However, fused silica is also a glass-forming oxide and contains other substances (e.g. alkaline components such as sodium, potassium, calcium and alumina, titania, etc.).
When the mixture is heat-treated at a temperature of 1000'C or higher, crystals such as cristobalite or trichimanite are formed, and the coefficient of thermal expansion is 4 to 5 x 10-'/
deg (room temperature to 100°C), and from this point of view, it has not been used as a thermal shock-resistant refractory.
By firing in the range of ~1250'C, ceramics with excellent thermal shock resistance were obtained, although the reason is not clear. - In addition to the above-mentioned rehydratable alumina, alkali titanate, and fused silica, molding aids (for example, CMC, MO, etc.) and plasticizers (glycerin, petrolatum), etc. can be added to water-friendly alumina at any time. 10% by weight, 5% by weight of potassium titanate (K2O.5'I'i, o2), 85% by weight of fused silica, 4.0 parts by weight of methylcellulose as a molding aid, and 2.0 parts by weight of glycerin as a plasticizer.
A mixture of 30 parts by weight and 30 parts by weight of water was kneaded using a screw kneader for 10 minutes and then fed to a screw extruder to form a molding machine with a length of 1002 at d 1o0% and a wall thickness of 0.
A honeycomb molded body consisting of square cells with a density of 3% and a side of 1.6z was molded. Next, this molded body was heated to 1200'C at a heating rate of 100°C/hour, and further heated to 1200'C.
Bake at 'O' for 1 hour. Table 1 shows the physical properties of the honeycomb structure thus obtained. Also, for comparison, Comparative Example B uses α-am 1203 powder instead of rehydrating alumina, Comparative Example B uses titanium oxide (anatase type TiO□) instead of potassium titanate, and Comparative Example B uses fused silica A honeycomb-shaped ceramic was produced in the same manner as in the above Example using Comparative Example C, in which cordierite powder was used instead of C. The physical properties at this time are also shown in Table 1.
（以 下 余 白 ）
第１表から明らかなように絹必須成分である再水和性ア
ルミナ、チタン酸アルカリ塩、溶融ノリ力からなる組成
物以外の比較個人、比較例Ｂ。(Left below) Comparative Example B, a comparative individual other than the composition consisting of rehydratable alumina, an alkali titanate, and melting adhesive, which are essential components of silk, as is clear from Table 1.
比較例Ｃ組成物は、上も己組成物に比べ耐圧強度が小さ
く、また熱膨張係数も大で耐熱衝撃性が悪かった。The composition of Comparative Example C had a lower compressive strength and a higher coefficient of thermal expansion than its own composition, and had poor thermal shock resistance.
〈実施例２〉
再水和性アルミナ、チタン酸カリウム、溶融クリ力の比
率を種々変化させ、実施例１と同様に成形助剤、可塑剤
、水を加え実施例１と同様にハニカム構造を作成し同様
に評価を行った。その結果、耐圧伸度、耐熱衝撃性に優
れている組成範囲は、第１図の斜線部であった。この範
囲以外での温度に対する熱膨張収縮率は、第２図乙の如
くであった。また水層発明のセラミックスではｂの如く
であった。曲線ａより溶融シリカから一部結晶化し、ク
リストバライト、トリシマナイト等の物質が生成したこ
とは容易に考えられ、熱膨張係数を大とし、熱衝撃性を
低下させたと推察される。なお、本室恵例のセラミック
スの熱膨張係数（常温〜１ｏＯｏ°Ｃ）はいずれも１．
３ Ｘ １０−６／ａｅｇ以上であった。<Example 2> The ratios of rehydratable alumina, potassium titanate, and melting strength were varied, and a forming aid, plasticizer, and water were added in the same manner as in Example 1, and a honeycomb structure was formed in the same manner as in Example 1. was created and evaluated in the same manner. As a result, the composition range with excellent compressive elongation resistance and thermal shock resistance was the shaded area in FIG. The thermal expansion and contraction coefficients at temperatures outside this range were as shown in Figure 2 B. In addition, the ceramics of the water layer invention were as shown in b. From curve a, it is easy to believe that some of the fused silica was crystallized to produce substances such as cristobalite and trichimanite, which increases the coefficient of thermal expansion and lowers the thermal shock resistance. In addition, the thermal expansion coefficient (room temperature to 1oOo°C) of the ceramics made by Megumi Honmuro is 1.
It was 3 x 10-6/aeg or more.
〈実施例３〉
再水和性アルミナ１０重量％、チタン酸アルカリ塩、５
重量％（アルカリ成分として、リチウム。<Example 3> Rehydratable alumina 10% by weight, alkali titanate salt, 5
% by weight (lithium as alkaline component.
ナトリウム、カリウム、／Ｌ／ビジウム、センウム。Sodium, potassium, /L/vidium, senium.
バリウム、ストロンチウム、カルシウムから選ばれる各
々のアルカリ金属原子からなるチタン酸アルカリ塩）と
、溶融ノリ力８５重量％および成形助剤としてメチルセ
ルロース４．０重量部、可塑剤としてグリセリン２．０
重量部、水３２重量部加えた混合物を実施例１と同様に
してハニカム状セラミックスを作成した。このものの物
性を第２表に示す。alkali titanate consisting of alkali metal atoms selected from barium, strontium, and calcium), 85% by weight of melting strength, 4.0 parts by weight of methyl cellulose as a molding aid, and 2.0 parts by weight of glycerin as a plasticizer.
A honeycomb-shaped ceramic was prepared in the same manner as in Example 1 using a mixture in which 32 parts by weight and 32 parts by weight of water were added. The physical properties of this product are shown in Table 2.
（以 下 余 白 ）
第２表から明らかなように本発明である再水和性アルミ
ナと各々のチタン酸アルカリ塩および溶融ンリカからな
るセラミックスは、耐圧強度、耐熱衝撃性とも優れてい
た。なかでもチタン酸カリウムを使用したものは耐熱衝
撃性が特に優れていた。(Margins below) As is clear from Table 2, the ceramics of the present invention comprising rehydratable alumina, each alkali titanate, and fused phosphoric acid were excellent in both compressive strength and thermal shock resistance. Among them, those using potassium titanate had particularly excellent thermal shock resistance.
〈実施例４〉
実施例３における各々のチタン酸アルカリ塩がウィスカ
ーである場合の物性を第３表に示す。なお試験用ハニカ
ム状セラミックスの作成は実施例１と同様に行った。<Example 4> Table 3 shows the physical properties when each alkali titanate salt in Example 3 is a whisker. Note that the honeycomb-shaped ceramics for testing were prepared in the same manner as in Example 1.
（以 下 余 白 ）
第３表よりチタン酸アルカリ塩がウィスカーである程熱
膨張係数は小さくなる傾向にあシ、また耐熱衝撃性も改
善された。(Margin below) Table 3 shows that the more the alkali titanate salt is a whisker, the smaller the coefficient of thermal expansion tends to be, and the thermal shock resistance is also improved.
〈実施例６〉
実施例４の志３ハニカム成形体における鍜焼温度１００
０〜１４ｏｏ′Ｃ範囲での各物性を第３図に示した。<Example 6> Firing temperature 100 in the Ai 3 honeycomb formed body of Example 4
The physical properties in the range of 0 to 14oo'C are shown in FIG.
第２図から明らかなように■焼温度１１０ｏ′Ｃ以下で
は耐圧強度が急激に小さくなり、１３００１１ｏＯ〜１
３００’Ｃで製造されたものがもっとも優れていた。As is clear from Fig. 2, the compressive strength decreases rapidly when the firing temperature is below 110o'C, and
The one produced at 300'C was the best.
なお、１０００℃で■焼して得たハニカム状セラミック
スおよび１２００’Ｃで■焼して得たハニカム状セラミ
ックスの断面の走査型電子顕微鏡写真を第４図に示した
。第４図ムは、１０００″Ｃ■焼のハニカム状セラミッ
クス断面の１００ｏＯ倍拡大写真であり、第４図すは、
１２０ｏ′ｃ■焼のハニカム状セラミックス断面の１０
０００倍拡大写真である。前記２つの走査型電子顕微鏡
写真からも、■焼濡度によって得られるセラミックスの
物性が大きく異なることは容易に推察される。第４図人
に示す写真から、チタン酸カリウム（Ｋ２Ｏ・た。Incidentally, scanning electron micrographs of the cross sections of the honeycomb-shaped ceramics obtained by firing at 1000° C. and the honeycomb-shaped ceramics obtained by firing at 1200° C. are shown in FIG. Figure 4 is a 100oO magnified photograph of a cross section of a 1000'' C* fired honeycomb-shaped ceramic.
10 cross sections of honeycomb-shaped ceramics fired at 120 o'c
This is a 1,000x enlarged photograph. From the above two scanning electron micrographs, it can be easily inferred that the physical properties of the ceramic obtained differ greatly depending on the firing wetness. From the photograph shown in Figure 4, potassium titanate (K2O.
発明の効果
以上述べてきたように、本発明によれば、比較的低温で
■焼することができ、緻密で耐熱衝撃性。Effects of the Invention As described above, according to the present invention, it is possible to bake at a relatively low temperature, and it is dense and has thermal shock resistance.
耐圧強度に優れた低コストで実用的なセラミックスを得
ることが可能できわめて有用である。It is possible to obtain practical ceramics with excellent pressure resistance and low cost, and is extremely useful.
第１図は、本発明の一実施例の耐熱衝撃性セラミックス
の組成範囲を示す状態図、第２図および第３図は同セラ
ミックスの■焼濡度に対する耐圧ある。
Ａ・・・・・・再水和性アルミナ、Ｂ・・・・・・チタ
ン酸アルカリ、Ｃ・・・・・・溶融シリカ。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第
ｌ 図 Ａ−−一再水相性アルミ
ナε−−−テグン峻アルカリ
Ｃ−一一溶扁東シソ、力
第２図
う１ 度 じ０）
区
憾FIG. 1 is a phase diagram showing the composition range of a thermal shock resistant ceramic according to an embodiment of the present invention, and FIGS. 2 and 3 show the pressure resistance of the same ceramic with respect to sintering wetness. A: Rehydratable alumina, B: Alkali titanate, C: Fused silica. Name of agent: Patent attorney Toshio Nakao and 1 other person
l Figure A--1 water-compatible alumina ε--Tegun-jung alkali C-11 molten perilla, force 2nd degree 1 degree ji0) gu 憾
Claims (6)
塩と溶融シリカからなる組成物を■焼して得られた耐熱
衝撃性セラミックス。(1) A thermal shock-resistant ceramic obtained by firing a composition consisting of at least rehydratable alumina, an alkali titanate, and fused silica.
ルカリ塩が１〜１０重量％、溶融シリカが７０〜９４重
量％からなることを特徴とする特許請求の範囲第１項記
載の耐熱衝撃性セラミックス。(2) 5 to 20% by weight of rehydratable alumina, 1 to 10% by weight of alkali titanate, and 70 to 94% by weight of fused silica; Thermal shock resistant ceramics.
ことを特徴とする特許請求の範囲第１項または第２項記
載の耐熱衝撃性セラミックス。(3) The thermal shock-resistant ceramic according to claim 1 or 2, wherein the alkali titanate salt consists of potassium titanate.
徴とする特許請求の範囲第１項、第２項または第３項記
載の耐熱衝撃性セラミックス。(4) The thermal shock-resistant ceramic according to claim 1, 2, or 3, wherein the alkali titanate salt is a whisker.
徴とする特許請求の範囲第１項から第４項の何れかに記
載の耐熱衝撃性セラミックス。(5) ■ The thermal shock-resistant ceramic according to any one of claims 1 to 4, characterized in that the firing temperature is 1100 to 1300°C.
であることを特徴とする特許請求の範囲第１項から第５
項の何れかに記載の耐熱衝撃性セラミックス。(6) Claims 1 to 5 characterized in that the coefficient of thermal expansion is 1.3 x 10^-^6/deg or less.
The thermal shock-resistant ceramics described in any of the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60113612A JPS61270255A (en) | 1985-05-27 | 1985-05-27 | Thermal shock resistant ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60113612A JPS61270255A (en) | 1985-05-27 | 1985-05-27 | Thermal shock resistant ceramic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61270255A true JPS61270255A (en) | 1986-11-29 |
| JPH0513101B2 JPH0513101B2 (en) | 1993-02-19 |
Family
ID=14616628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60113612A Granted JPS61270255A (en) | 1985-05-27 | 1985-05-27 | Thermal shock resistant ceramic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61270255A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH029452A (en) * | 1988-06-29 | 1990-01-12 | Matsushita Electric Ind Co Ltd | Catalyst for exhaust gas cleaning and its manufacture |
| JPH02198641A (en) * | 1989-01-26 | 1990-08-07 | Matsushita Electric Ind Co Ltd | Catalyst and production thereof |
-
1985
- 1985-05-27 JP JP60113612A patent/JPS61270255A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH029452A (en) * | 1988-06-29 | 1990-01-12 | Matsushita Electric Ind Co Ltd | Catalyst for exhaust gas cleaning and its manufacture |
| JPH02198641A (en) * | 1989-01-26 | 1990-08-07 | Matsushita Electric Ind Co Ltd | Catalyst and production thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0513101B2 (en) | 1993-02-19 |
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