JPH02311361A - Production of aluminum titanate sintered compact stable at high temperature - Google Patents
Production of aluminum titanate sintered compact stable at high temperatureInfo
- Publication number
- JPH02311361A JPH02311361A JP1134386A JP13438689A JPH02311361A JP H02311361 A JPH02311361 A JP H02311361A JP 1134386 A JP1134386 A JP 1134386A JP 13438689 A JP13438689 A JP 13438689A JP H02311361 A JPH02311361 A JP H02311361A
- Authority
- JP
- Japan
- Prior art keywords
- forming
- aluminum titanate
- powder
- mixed powder
- al2o3
- 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.)
- Pending
Links
- 229910000505 Al2TiO5 Inorganic materials 0.000 title claims abstract description 17
- 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 title claims description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 150000001875 compounds Chemical class 0.000 claims abstract description 16
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 15
- 239000011029 spinel Substances 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000011812 mixed powder Substances 0.000 claims abstract description 12
- 238000005245 sintering Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 4
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims 1
- 239000000654 additive Substances 0.000 abstract description 11
- 230000035939 shock Effects 0.000 abstract description 9
- 229910052593 corundum Inorganic materials 0.000 abstract description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 5
- 230000000996 additive effect Effects 0.000 abstract description 5
- -1 MgO Chemical class 0.000 abstract description 2
- 229910026161 MgAl2O4 Inorganic materials 0.000 abstract 1
- 229910001691 hercynite Inorganic materials 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 238000000354 decomposition reaction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000013001 point bending Methods 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910016583 MnAl Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、高温安定性チタン酸アルミニウム焼結体の製
造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for producing a high temperature stable aluminum titanate sintered body.
（従来の技術）
セラミックは耐熱性、耐薬品性等種々の優れた特性を有
することから広い範囲での用途が期待されているが、一
般に熱衝撃に弱いという欠点のためにその用途が限られ
ている。(Prior art) Ceramics are expected to be used in a wide range of applications because they have various excellent properties such as heat resistance and chemical resistance, but their use is generally limited due to their weakness in thermal shock. ing.
セラミックの耐熱衝撃性は、セラミックを低熱膨張性に
すると改善されることが既に知られている。しかして、
セラミックのうち、チタン酸アルミニウム、焼結体は高
融点をもつ低熱膨張性材料で、耐熱衝撃性に優れ、また
熱伝導性が低く、断熱性にも優れている材料として古く
から注目されているが、この焼結体の低熱膨張性は、構
成結晶の熱膨張の異方性によるマイクロクラックに起因
しているため、機械的強度が弱く、緻密に焼結できない
という問題点を有し、また、１１００°Ｃ付近に分解温
度をもつため８００°Ｃ付近から徐々にコランダムとル
チルに分解し、特に還元雰囲気中では分解傾向が著しい
などの材質的欠点を有することから実用化が制限されて
いる。It is already known that the thermal shock resistance of ceramics is improved by making the ceramics have low thermal expansion. However,
Among ceramics, aluminum titanate and sintered bodies are materials with high melting points and low thermal expansion, and have long been attracting attention as materials with excellent thermal shock resistance, low thermal conductivity, and excellent heat insulation properties. However, the low thermal expansion of this sintered body is due to microcracks caused by the anisotropy of thermal expansion of the constituent crystals, which has the problem of low mechanical strength and the inability to sinter densely. Since it has a decomposition temperature around 1100°C, it gradually decomposes into corundum and rutile from around 800°C, and its practical use is limited because it has material defects such as a marked tendency to decompose, especially in a reducing atmosphere. .
そのため、従来より上記価れた特性を失うことなく、高
温で安定な高強度チタン酸アルミニウム焼結体を得る方
法が求められており、この要求に応えるものとして例え
ば、Ａ１２ＴｉＯｅにマグネシウム化合物と珪素化合物
を特定量加えて焼結する方法（特開昭５７−３７６７号
公報）や、チタン酸アルミニウムの成形体の表面にマグ
ネシウム、鉄等の化合物を被覆して焼成する方法（特開
昭５６−４１８８３号公報）などが提案されている。Therefore, there has been a demand for a method of obtaining a high-strength aluminum titanate sintered body that is stable at high temperatures without losing the above-mentioned valuable properties. A method of adding a specific amount of aluminum titanate and sintering it (Japanese Patent Laid-Open No. 57-3767), or a method of coating the surface of an aluminum titanate molded body with a compound such as magnesium or iron and firing it (Japanese Patent Laid-Open No. 56-41883) Publication No. 2), etc. have been proposed.
（発明が解決しようとする課題）
本発明は、チタン酸アルミニウム焼結体の有する低熱膨
張性、耐熱衝撃性を更に改善するとともに、高温度で安
定で物理的強度の向上されたチタン酸アルミニウム焼結
体を製造し得る方法を提供することを技術的課題とする
ものである。(Problems to be Solved by the Invention) The present invention further improves the low thermal expansion and thermal shock resistance of aluminum titanate sintered bodies, and also provides aluminum titanate sintered bodies that are stable at high temperatures and have improved physical strength. The technical problem is to provide a method for producing aggregates.
（課題を解決するための手段）
本発明の高温安定性チタン酸アルミニウム焼結体の製造
方法は、Ａ１□０３とＴｌＯ２が等モル組成の混合粉末
もしくはＡｌ２ＴｉＯ５粉末に、スピネル構造をとる化
合物またはスピネル構造を形成するＡ１□０３と金属酸
化物との混合物の粉末を０５〜２０重量％添加して混粉
、成形し、焼結することを特徴とする。(Means for Solving the Problems) The method for producing a high-temperature stable aluminum titanate sintered body of the present invention includes adding a compound having a spinel structure or spinel to a mixed powder or Al2TiO5 powder having an equimolar composition of A1□03 and TlO2. It is characterized in that a powder of a mixture of A1□03 and metal oxide that forms the structure is added in an amount of 05 to 20% by weight, mixed, molded, and sintered.
本発明は、チタン酸アルミニウム焼結体を得るにあたり
、原料として、焼結時にチタン酸アルミニウム（Ａ１２
Ｔ１０５１ を形成する、Ａｌ２Ｏ３とＴｌＯ２が等モ
ル組成の混合粉末を使用しても良いし、またＡｌａＴｉ
Ｏｓを使用しても良い。Ａ１２０− とＴｉ’０２の混
合粉末を使用する場合、いずれか一方の成分が残ると、
得られた焼結体の低熱膨張性を失うため、等モル量で使
用することが必要である。In obtaining an aluminum titanate sintered body, the present invention uses aluminum titanate (A12
A mixed powder with an equimolar composition of Al2O3 and TlO2 forming T1051 may be used, or a mixed powder with an equimolar composition of Al2O3 and TlO2 may be used.
Os may also be used. When using a mixed powder of A120- and Ti'02, if one of the components remains,
Since the resulting sintered body loses its low thermal expansion properties, it is necessary to use it in equimolar amounts.
本発明において、高温安定性等を得る目的で添加される
添加剤としてのスピネル構造をとる化合物（以下、スピ
ネル化合物という）としては、具体的には例えばＭｇＡ
１２０ｘ、ＦｅＡ１□Ｏｎ、ＭｎＡｌ□０４． ＣＯＡ
］２０４ 、 ＺｎＡｌｔＯ＜ 、 ＮｉＡｌ２Ｏ＜等
を挙げることができ、これらは１種または２種以上用い
られる。In the present invention, the compound having a spinel structure (hereinafter referred to as a spinel compound) as an additive added for the purpose of obtaining high temperature stability etc. is specifically, for example, MgA
120x, FeA1□On, MnAl□04. COA
]204, ZnAltO<, NiAl2O<, etc., and one or more of these may be used.
また、本発明においては、添加剤として上記スピネル化
合物に代えて、焼結時にＡ１゜０３と化合してスピネル
構造を形成する化合物（以下、スピネル形成化合物とい
う）をＡ１□０３とともに使用することができる。スピ
ネル形成化合物としては、金属元素Ｍｇ、Ｆｅ、Ｍｎ、
Ｇｏ、Ｚｎ、 Ｎｉ等の酸化物、例えばＭｇＯ１Ｆｅ
Ｊ３等が使用できる。Furthermore, in the present invention, instead of the spinel compound described above, a compound that combines with A1゜03 to form a spinel structure during sintering (hereinafter referred to as a spinel-forming compound) may be used together with A1゜03 as an additive. can. Spinel-forming compounds include metal elements Mg, Fe, Mn,
Oxides such as Go, Zn, Ni, etc., e.g. MgO1Fe
J3 etc. can be used.
このスピネル形成化合物とＡｌ２Ｏ３とは、いずれか一
方の成分がそのままの形で残らない量、すなわち化学量
論的量で使用される。The spinel-forming compound and Al2O3 are used in amounts that do not leave either component intact, that is, stoichiometric amounts.
上記スピネル化合物粉末およびＡｌ２Ｏ３とスピネル形
成化合物との混合粉末は、 ０５重量％以下添加したの
では得られた焼結体の分解温度が低く熱安定性に乏しく
、曲げ強度の向上が著しくないため好ましくない。一方
、添加量が２０重量％以上では、焼結体の熱膨張率が大
となり、耐熱衝撃性が低下する。そのため、添加量は０
．５〜２０重量％と定めた。The above-mentioned spinel compound powder and mixed powder of Al2O3 and a spinel-forming compound are preferable because if the amount is less than 0.05% by weight, the resulting sintered body will have a low decomposition temperature and poor thermal stability, and the bending strength will not be significantly improved. do not have. On the other hand, if the amount added is 20% by weight or more, the coefficient of thermal expansion of the sintered body becomes large and the thermal shock resistance decreases. Therefore, the amount added is 0
．． The content was determined to be 5 to 20% by weight.
本発明において焼結用粉末は通常焼結用として用いられ
る粉粒度のものが使用されるが、添加剤は出来るだけ微
細な粉末のものが良い。これらは、例えば１μｍ以下の
ものが好ましい。In the present invention, the sintering powder used is of a particle size normally used for sintering, but the additives are preferably powders as fine as possible. These are preferably, for example, 1 μm or less.
焼結に際しては、従来公知の方法により、充分に混扮し
、所望の形状に金型にて圧粉成形し、焼結する。焼結は
特に限定されることなく、従来チタン酸アルミニウムの
焼結に用いられている雰囲気条件、焼成温度が使用でき
る。For sintering, the mixture is thoroughly mixed, compacted into a desired shape using a mold, and sintered using a conventionally known method. Sintering is not particularly limited, and the atmospheric conditions and firing temperatures conventionally used for sintering aluminum titanate can be used.
（実施例）
以下、本発明を実施例により説明するが、本発明はこれ
らに限定されるものではない。なお、実施例中％は重量
％を表わす。(Examples) Hereinafter, the present invention will be explained using Examples, but the present invention is not limited thereto. Note that in the examples, % represents weight %.
実施例
平均粒径″ｌＬＬｍのＡ１゜０３とＴｉＯ□の各粉末を
等モル組成で混合した混合粉末もしくはＡ１゜Ｔ１０５
粉末に、添加剤として下表に示すスピネル化合物粉末ま
たはＡ１□０３とスピネル形成化合物（金属酸化物）の
粉末をそれぞれ表に記載した量で添加し、充分によく混
合した。Example A mixed powder or A1°T105 in which A1゜03 and TiO□ powders with an average particle size of ``1LLm'' were mixed in an equimolar composition.
To the powder, spinel compound powder shown in the table below or A1□03 and spinel forming compound (metal oxide) powder shown in the table below were added as additives in the amounts shown in the table, and mixed thoroughly.
得られた混合粉末を金型に充填し、静水等方圧プレスに
て１００１００Ｏ／ｃｍ２で加圧成形した。The obtained mixed powder was filled into a mold and pressure-molded at 100,100 O/cm2 using a hydrostatic isostatic press.
粉末成形体を大気炉中で１５００°Ｃに６°Ｃ／分の速
度で昇温し、２時間保持した後、６℃／分の速度で冷却
して、各焼結体を得た。The powder compact was heated to 1500°C in an atmospheric furnace at a rate of 6°C/min, held for 2 hours, and then cooled at a rate of 6°C/min to obtain each sintered body.
得られたそれぞれの焼結体（試料）について、４点曲げ
強度および室温〜１０００°Ｃ間の平均熱膨張係数（α
ｘ １０−６／ ’Ｃ）を測定した。また、試料を所定
温度で２５時間保持した後、Ｘ線回折を行ない分解の始
まった温度を分解温度とした。４点曲げ強度は、ＪＩＳ
Ｒ１６０］規格の測定方法に従った。For each obtained sintered body (sample), the four-point bending strength and the average coefficient of thermal expansion between room temperature and 1000°C (α
x 10-6/'C) was measured. Further, after holding the sample at a predetermined temperature for 25 hours, X-ray diffraction was performed, and the temperature at which decomposition started was defined as the decomposition temperature. 4-point bending strength is JIS
R160] according to the standard measurement method.
得られた測定結果を下表に示ず。The measurement results obtained are not shown in the table below.
（発明の効果）
表の結果かられかるように、添加剤未添加の焼結体（比
較例１）の分解温度は８００℃であるが、添加剤を０６
５％以上添加することによって、１１００°Ｃ以上に向
上する。添加量が０．１％（比較例２と４）では分解温
度は９００°Ｃと若干向上するが、曲げ強度の著しい向
上が見られないため、 ０５％未満では効果が認められ
ない。(Effect of the invention) As can be seen from the results in the table, the decomposition temperature of the sintered body without additives (Comparative Example 1) is 800°C, but with
By adding 5% or more, the temperature can be increased to 1100°C or higher. When the amount added is 0.1% (Comparative Examples 2 and 4), the decomposition temperature is slightly improved to 900°C, but no significant improvement in bending strength is observed, so no effect is observed when the amount is less than 0.05%.
曲げ強度は未添加のものが３ ＭＰａであるのに対して
、添加剤を０．５％以上加えることによって１０ ＭＰ
ａ以上に向上した。添加剤は２０％を越えて添加しても
、得られる焼結体の曲げ強度は向上するが、熱膨張係数
が３． ＯＸ １０−６／ ℃以上となるため好ましく
ない（比較例３と５）。The bending strength is 3 MPa without additives, but it is 10 MPa with the addition of 0.5% or more of additives.
Improved above a. Even if more than 20% of the additive is added, the bending strength of the resulting sintered body will improve, but the thermal expansion coefficient will be 3. OX 10-6/°C or higher, which is not preferable (Comparative Examples 3 and 5).
熱膨張係数は、添加剤の量が０．５〜２０％の範囲内で
は、未添加のもの（比較例１）の熱膨張係数２．０ｘｌ
Ｏ−６／°Ｃよりも低く、耐熱衝撃性が損なわれていな
いことが認められた。The coefficient of thermal expansion is 2.0xl when the amount of additive is in the range of 0.5 to 20%, that of the one without additives (Comparative Example 1)
It was found that the thermal shock resistance was lower than O-6/°C, and the thermal shock resistance was not impaired.
上記の結果かられかるように、本発明方法によって、約
９００〜１３００°Ｃの高温度で安定で、耐熱衝撃性を
有する高強度のチタン酸アルミニウム焼結体を得ること
ができる。As can be seen from the above results, by the method of the present invention, it is possible to obtain a high-strength aluminum titanate sintered body that is stable at high temperatures of about 900 to 1300°C and has thermal shock resistance.
Claims (1)
もしくはＡｌ＿２ＴｉＯ＿５粉末に、スピネル構造をと
る化合物粉末またはスピネル構造を形成するＡｌ＿２Ｏ
＿３と金属酸化物との混合粉末を０．５〜２０重量％添
加して成形し、焼結することを特徴とする高温安定性チ
タン酸アルミニウム焼結体の製造方法。Mixed powder with equimolar composition of Al_2O_3 and TiO_2 or Al_2TiO_5 powder with compound powder having a spinel structure or Al_2O forming a spinel structure
A method for producing a high-temperature stable aluminum titanate sintered body, comprising adding 0.5 to 20% by weight of a mixed powder of _3 and a metal oxide, molding, and sintering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1134386A JPH02311361A (en) | 1989-05-27 | 1989-05-27 | Production of aluminum titanate sintered compact stable at high temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1134386A JPH02311361A (en) | 1989-05-27 | 1989-05-27 | Production of aluminum titanate sintered compact stable at high temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02311361A true JPH02311361A (en) | 1990-12-26 |
Family
ID=15127184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1134386A Pending JPH02311361A (en) | 1989-05-27 | 1989-05-27 | Production of aluminum titanate sintered compact stable at high temperature |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02311361A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003095738A (en) * | 2001-09-27 | 2003-04-03 | Itochu Ceratech Corp | Titania or alumina-titania clinker, and refractory obtained by using the clinker |
| WO2005009918A1 (en) * | 2003-07-29 | 2005-02-03 | Ohcera Co., Ltd. | Honeycomb carrier for exhaust gas clarification catalyst and method for production thereof |
| JP2005046667A (en) * | 2003-07-29 | 2005-02-24 | Ohcera Co Ltd | Honeycomb carrier for exhaust gas cleaning catalyst and its manufacturing method |
| JP2005087797A (en) * | 2003-09-12 | 2005-04-07 | Ohcera Co Ltd | Honeycomb carrier for exhaust gas cleaning catalyst and manufacturing method therefor |
| JPWO2005018776A1 (en) * | 2003-08-22 | 2006-10-19 | オーセラ株式会社 | Exhaust gas purification honeycomb filter and manufacturing method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63236759A (en) * | 1987-03-24 | 1988-10-03 | 日本碍子株式会社 | Ceramic material for casting |
-
1989
- 1989-05-27 JP JP1134386A patent/JPH02311361A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63236759A (en) * | 1987-03-24 | 1988-10-03 | 日本碍子株式会社 | Ceramic material for casting |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003095738A (en) * | 2001-09-27 | 2003-04-03 | Itochu Ceratech Corp | Titania or alumina-titania clinker, and refractory obtained by using the clinker |
| WO2005009918A1 (en) * | 2003-07-29 | 2005-02-03 | Ohcera Co., Ltd. | Honeycomb carrier for exhaust gas clarification catalyst and method for production thereof |
| JP2005046667A (en) * | 2003-07-29 | 2005-02-24 | Ohcera Co Ltd | Honeycomb carrier for exhaust gas cleaning catalyst and its manufacturing method |
| JP4609831B2 (en) * | 2003-07-29 | 2011-01-12 | オーセラ株式会社 | Honeycomb carrier for exhaust gas purification catalyst and manufacturing method thereof |
| US8685363B2 (en) | 2003-07-29 | 2014-04-01 | Ohcera Co., Ltd. | Honeycomb carrier for exhaust gas clarification catalyst and method for production thereof |
| JPWO2005018776A1 (en) * | 2003-08-22 | 2006-10-19 | オーセラ株式会社 | Exhaust gas purification honeycomb filter and manufacturing method thereof |
| JP5123483B2 (en) * | 2003-08-22 | 2013-01-23 | オーセラ株式会社 | Manufacturing method of honeycomb filter for exhaust gas purification |
| JP2005087797A (en) * | 2003-09-12 | 2005-04-07 | Ohcera Co Ltd | Honeycomb carrier for exhaust gas cleaning catalyst and manufacturing method therefor |
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