JPH0555462B2 - - Google Patents
Info
- Publication number
- JPH0555462B2 JPH0555462B2 JP63275416A JP27541688A JPH0555462B2 JP H0555462 B2 JPH0555462 B2 JP H0555462B2 JP 63275416 A JP63275416 A JP 63275416A JP 27541688 A JP27541688 A JP 27541688A JP H0555462 B2 JPH0555462 B2 JP H0555462B2
- Authority
- JP
- Japan
- Prior art keywords
- magnesia
- heat insulating
- insulating material
- fibrous
- whiskers
- 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.)
- Expired - Lifetime
Links
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 83
- 239000000395 magnesium oxide Substances 0.000 claims description 42
- 239000011810 insulating material Substances 0.000 claims description 36
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 239000012774 insulation material Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000000919 ceramic Substances 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 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 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 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
- C04B30/00—Compositions for artificial stone, not containing binders
- C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
［産業上の利用分野］
本発明は繊維状マグネシア断熱材及びその製造
方法に係り、特に工業用炉、実験炉等の比較的小
型な炉に用いられる断熱材、とりわけ超高温炉に
用いられる断熱材として好適な繊維状マグネシア
断熱材及びその製造方法に関する。
［従来の技術］
従来より、繊維状断熱材として、石綿、チタン
酸カリウム、ガラスウール、ロツクウール等の比
較的低温度域での使用に対しての耐久性を備える
断熱材は古くから知られている。
また、近年、1000℃以上といつた比較的高温度
での耐用性を備える断熱材として珪酸カルシウム
（ゾノトライト系）や、セラミツクスフアイバー
を用いた断熱材などが開発されている。
セラミツクスフアイバー断熱材を製造するに
は、まず、仮焼アルミナ、シリカサンド等の高純
度原料を用い、必要に応じてB2O、Cr2O3、その
他の成分を添加配合して電気炉で溶融する。そし
て溶融液を流出させることにより非晶質化してフ
アイバー状とし、これを成形して断熱材とする。
このフアイバー状としたものはバルクと称される
が、バルクを乾式又は湿式で不織布成形したもの
はブランケツトと呼称され、少量の有機質又は、
無機質バインダーで成形したものはフエルトと呼
称されている。
このようなセラミツクスフアイバーよりなる断
熱材の製造にあたり、仮焼アルミナとシリカサン
ドとはAl2O3／SiO2モル比が１となるように配合
するのが一般的である。
その他にAl2O3とSiO2の配合比が95対５の、高
アルミナ質の特殊な製法で製造される多結晶質ア
ルミナフアイバーよりなる断熱材も提案されてい
る。
［発明が解決しようとする課題］
Al2O3／SiO2モル比が１の従来の高温用セラミ
ツクスフアイバーの融点は1500℃と称されている
が、使用時の加熱温度により、950〜1000℃の範
囲でムライトの結晶が析出し、1200℃以上でクリ
ストバライトの結晶が析出する。このような使用
温度における結晶の析出がフアイバーの収縮と劣
化の原因となり、ブランケツト状又はフエルト状
断熱材が収縮、劣化、破損する。このため、従来
のセラミツクスフアイバー断熱材の耐用可能な温
度は1260℃とされている。
また、多結晶質アルミナフアイバーは耐用可能
な温度が1700℃とされているが、高価なために、
単独で多結晶質アルミナフアイバー断熱材として
使用することは稀であり、通常は多結晶質アルミ
ナフアイバーと非晶質セラミツクスフアイバーと
を混合してブランケツト状又はフエルト状に成形
し断熱材を製造しているのが現状である。このた
め、その耐用可能な温度は1600℃より低いものと
なつている。
このように、従来においては1600℃以上の超高
温度域においても使用可能な断熱材が提供されて
おらず、その開発が望まれている。
本発明は上記従来の問題点を解決し、耐用温度
の著しく高い断熱材及びその製造方法を提供する
ことを目的とする。
［課題を解決するための手段］
請求項１の繊維状マグネシア断熱材は、マグネ
シアウイスカーをブランケツト又はフエルト状に
成形した成形体を焼結してなることを特徴とす
る。
請求項２の繊維状マグネシア断熱材の製造方法
は、マグネシアウイスカーを水又は水溶液に分散
懸濁し、得られた懸濁スラリーをブランケツト又
はフエルト状に脱水成形し、乾燥後、1500℃以上
の温度でウイスカーの表面同志を部分的に焼結さ
せることを特徴とする。
以下に本発明を詳細に説明する。
請求項１の繊維状マグネシア断熱材は、好まし
くは請求項２の繊維状マグネシア断熱材の製造方
法により製造される。
以下に請求項２の繊維状マグネシア断熱材の製
造方法について説明する。
請求項２の方法においては、まず、マグネシア
ウイスカーを水又は水溶液に分散懸濁し懸濁スラ
リーとする。この懸濁スラリーのマグネシアウイ
スカー含有量には特に制限はないが、一般には５
〜30ｇのマグネシアウイスカーを100ml程度の水
又は水溶液に懸濁させる。そして、得られた懸濁
スラリーを公知の方法に従つて脱水成形し、ブラ
ンケツト状又はフエルト状成形体を得る。
この際、フエルト状成形体とするには、分散媒
体として有機質バインダー又は無機質バインダー
を含有する水溶液を用いて懸濁スラリーを調製す
る。この場合、有機質バインダーとしては、メチ
ルセルローズ、エチルセルローズ、ポリビニルア
ルコール等を用いることができ、無機質バインダ
ーとしてはシリカ、アルミナ、ジルコニア等を用
いることができる。これらの有機質又は無機質バ
インダーの使用量はマグネシアウイスカーに対し
て0.5〜5.0重量％程度とするのが好ましい。
懸濁スラリーの脱水成形方法としては、特に制
限はないが、例えば、懸濁スラリーを成形型枠に
流し込み、型押しにより脱水成形する方法等を採
用することができる。
得られた成形体は十分に乾燥した後、1500℃以
上の炉内で焼成してウイスカーの表面同志を焼結
させる。この焼成は、通常、1500℃以上で0.5時
間以上、好ましくは1550〜1600℃の温度で１〜２
時間程度行なう。
このようにして製造される、マグネシアウイス
カーの表面同志が接合された、耐熱性に優れた繊
維状マグネシア断熱材は、嵩密度が0.1〜0.5ｇ／
cm3程度であることが好ましい。
なお、本発明において、マグネシアウイスカー
としては、特開昭63−166715号で開示されるマグ
ネシアウイスカーの製造方法により、即ち、塩化
マグネシウムとハロゲン化物との混合物を650℃
以上で加熱溶融し、得られた溶融塩を水蒸気雰囲
気で650〜1000℃で加熱することにより製造され
るマグネシアウイスカー、或いは特願昭63−
141146号、特願昭63−145468号、特願昭63−
15469号で製造されるマグネシアウイスカー等を
用いることができ、その直径は１〜5μｍ、長さ
は５〜3000μｍ程度のものが好適である。
［作用］
本発明の繊維状マグネシア断熱材を構成するマ
グネシアウイスカーは、針状のマグネシア単結晶
であり、マグネシアの物理的、化学的性質を有効
に生かすことができるものである。即ち、このマ
グネシアウイスカーは、マグネシアの融点が2800
℃と極めて高いため耐熱性に著しく優れる。しか
も、マグネシアウイスカーは軽量で引張強度も
100〜1000（Kg／mm2）と高強度である。また、針状
の結晶体であるため、プランケツト状又はフエル
ト状の軽量成形体を容易に製造できる。その上、
多結晶体セラミツクスに比べて安価に提供され
る。
このため、請求項１の繊維状マグネシア断熱材
によれば、軽量で、耐熱使用温度が高く、かつ機
械的強度も高い繊維状断熱材が低コストに提供さ
れる。因みに請求項１の繊維状マグネシア断熱材
は、1600℃以上の温度にて直接に高温物体や高温
雰囲気に接する耐火断熱材として使用することが
可能である。
請求項１の繊維状マグネシア断熱材は、請求項
２の方法により容易かつ効率的に製造することが
できる。
［実施例］
以下実施例及び比較例について説明する。
実施例 １
直径１〜5μｍ、長さ５〜3000μｍのマグネシア
ウイスカー20ｇを100mlの水に懸濁させ、さらに
アルミナを３％添加し、得られた懸濁スラリーを
濾過布を敷いた型枠に流し込み、型押しして脱水
した。その後、乾燥炉で２〜３日乾燥して、厚さ
2.4cmの軽量マツトを得た。これを1600℃で２時
間焼成することにより、ウイスカーの表面が互い
に焼結した本発明の繊維状マグネシア断熱材を得
た。
得られた繊維状マグネシア断熱材の物性及び耐
熱試験結果を第１表に示す。
なお、耐熱試験は繊維状マグネシア断熱材を炉
内容積４の実炉の内壁に取り付け、第１表に示
す昇温時間で昇温した後、1750℃で1000時間保持
した場合の断熱材の経時変化を調べることにより
行なつた。
比較例 １
マグネシアウイスカーの代りにアルミナフアイ
バー（直径１〜5μｍ、長さ100〜5000mm）を用い
たこと以外は同様にして繊維状アルミナ断熱材を
製造した。得られた繊維状アルミナ断熱材の物性
及び耐熱試験結果を第１表に示す。
[Field of Industrial Application] The present invention relates to a fibrous magnesia heat insulating material and a method for producing the same, and particularly relates to a heat insulating material used in relatively small furnaces such as industrial furnaces and experimental furnaces, and particularly a heat insulating material used in ultra-high temperature furnaces. The present invention relates to a fibrous magnesia heat insulating material suitable as a material and a method for producing the same. [Prior art] Insulating materials that are durable for use in relatively low temperature ranges, such as asbestos, potassium titanate, glass wool, and rock wool, have been known for a long time as fibrous insulation materials. There is. In addition, in recent years, heat insulating materials using calcium silicate (xonotrite type) and ceramic fibers have been developed as heat insulating materials that can withstand relatively high temperatures of 1000°C or higher. To manufacture ceramic fiber insulation materials, first, high-purity raw materials such as calcined alumina and silica sand are used, B 2 O, Cr 2 O 3 and other ingredients are added and blended as necessary, and the mixture is heated in an electric furnace. melt. Then, by flowing out the melt, it becomes amorphous into a fiber shape, which is then molded into a heat insulating material.
This fiber-like product is called a bulk, but a non-woven fabric formed from a bulk using a dry or wet process is called a blanket, and contains a small amount of organic material or
Materials molded with an inorganic binder are called felt. In manufacturing such a heat insulating material made of ceramic fibers, calcined alumina and silica sand are generally mixed so that the Al 2 O 3 /SiO 2 molar ratio is 1. In addition, a heat insulating material made of polycrystalline alumina fiber manufactured using a special manufacturing method with a high alumina content in which the blending ratio of Al 2 O 3 and SiO 2 is 95:5 has also been proposed. [Problem to be solved by the invention] The melting point of conventional high-temperature ceramic fibers with an Al 2 O 3 /SiO 2 molar ratio of 1 is said to be 1500°C, but it can range from 950 to 1000°C depending on the heating temperature during use. Mullite crystals precipitate at temperatures above 1200°C, and cristobalite crystals precipitate at temperatures above 1200°C. Precipitation of crystals at such service temperatures causes shrinkage and deterioration of the fibers, causing shrinkage, deterioration, and damage of the blanket or felt insulation material. For this reason, the temperature that conventional ceramic fiber insulation materials can withstand is said to be 1260°C. In addition, polycrystalline alumina fibers are said to be able to withstand temperatures of 1700°C, but due to their high price,
It is rare that polycrystalline alumina fiber is used alone as a heat insulating material; usually, polycrystalline alumina fiber and amorphous ceramic fiber are mixed together and formed into a blanket or felt shape to produce heat insulating material. The current situation is that For this reason, the temperature at which it can withstand is lower than 1600°C. As described above, no heat insulating material that can be used even in the ultra-high temperature range of 1600° C. or higher has been provided so far, and the development of such a material is desired. An object of the present invention is to solve the above-mentioned conventional problems and provide a heat insulating material with a significantly high service temperature and a method for manufacturing the same. [Means for Solving the Problems] The fibrous magnesia heat insulating material according to claim 1 is characterized in that it is formed by sintering a molded body obtained by molding magnesia whiskers into a blanket or felt shape. The method for producing a fibrous magnesia heat insulating material according to claim 2 includes dispersing and suspending magnesia whiskers in water or an aqueous solution, dehydrating and molding the obtained suspension slurry into a blanket or felt shape, and drying it at a temperature of 1500°C or higher. It is characterized by partially sintering the surfaces of the whiskers. The present invention will be explained in detail below. The fibrous magnesia heat insulating material according to claim 1 is preferably produced by the method for producing fibrous magnesia heat insulating material according to claim 2. A method for producing a fibrous magnesia heat insulating material according to a second aspect of the present invention will be explained below. In the method of claim 2, first, magnesia whiskers are dispersed and suspended in water or an aqueous solution to form a suspended slurry. There is no particular limit to the magnesia whisker content of this suspension slurry, but it is generally 5.
Suspend ~30g of magnesia whiskers in approximately 100ml of water or aqueous solution. The obtained suspension slurry is then dehydrated and molded according to a known method to obtain a blanket-like or felt-like molded product. At this time, in order to form a felt-like molded article, a suspension slurry is prepared using an aqueous solution containing an organic binder or an inorganic binder as a dispersion medium. In this case, as the organic binder, methyl cellulose, ethyl cellulose, polyvinyl alcohol, etc. can be used, and as the inorganic binder, silica, alumina, zirconia, etc. can be used. The amount of these organic or inorganic binders used is preferably about 0.5 to 5.0% by weight based on the magnesia whisker. There are no particular limitations on the method for dehydrating and molding the suspended slurry, but for example, a method of pouring the suspended slurry into a molding frame and dehydrating and molding by pressing can be adopted. After the obtained molded body is sufficiently dried, it is fired in a furnace at 1500° C. or higher to sinter the surfaces of the whiskers. This firing is usually performed at a temperature of 1500°C or higher for 0.5 hours or more, preferably for 1 to 2 hours at a temperature of 1550 to 1600°C.
Do this for about an hour. The fibrous magnesia heat insulating material with excellent heat resistance, in which the surfaces of magnesia whiskers are bonded together, produced in this way has a bulk density of 0.1 to 0.5 g/
It is preferable that it is about cm 3 . In the present invention, the magnesia whisker is produced by the method for manufacturing magnesia whisker disclosed in JP-A-63-166715, that is, a mixture of magnesium chloride and a halide is heated at 650°C.
Magnesia whiskers produced by heating the above and heating the obtained molten salt at 650 to 1000°C in a steam atmosphere, or patent application 1983-
141146, patent application No. 145468, patent application No. 1983-
Magnesia whiskers manufactured by No. 15469 can be used, and those having a diameter of about 1 to 5 μm and a length of about 5 to 3000 μm are suitable. [Function] The magnesia whiskers constituting the fibrous magnesia heat insulating material of the present invention are acicular single crystals of magnesia, and can effectively utilize the physical and chemical properties of magnesia. In other words, this magnesia whisker has a melting point of magnesia of 2800.
℃, so it has excellent heat resistance. Moreover, magnesia whiskers are lightweight and have high tensile strength.
It has high strength of 100 to 1000 (Kg/mm 2 ). Moreover, since it is a needle-like crystalline body, a lightweight molded body in the shape of a plumcket or felt can be easily manufactured. On top of that,
It can be provided at a lower cost than polycrystalline ceramics. Therefore, according to the fibrous magnesia heat insulating material of the first aspect, a fibrous heat insulating material that is lightweight, has a high heat-resistant operating temperature, and has high mechanical strength can be provided at low cost. Incidentally, the fibrous magnesia heat insulating material of claim 1 can be used as a fireproof heat insulating material that comes into direct contact with a high-temperature object or a high-temperature atmosphere at a temperature of 1600° C. or higher. The fibrous magnesia heat insulating material according to the first aspect can be easily and efficiently produced by the method according to the second aspect. [Example] Examples and comparative examples will be described below. Example 1 20 g of magnesia whiskers with a diameter of 1 to 5 μm and a length of 5 to 3000 μm were suspended in 100 ml of water, 3% alumina was added, and the resulting suspended slurry was poured into a mold lined with a filter cloth. , embossed and dehydrated. After that, it is dried in a drying oven for 2 to 3 days to create a thick
A lightweight pine of 2.4 cm was obtained. By firing this at 1600° C. for 2 hours, a fibrous magnesia heat insulating material of the present invention in which the whisker surfaces were sintered together was obtained. Table 1 shows the physical properties and heat resistance test results of the obtained fibrous magnesia heat insulating material. The heat resistance test was conducted by attaching fibrous magnesia insulation to the inner wall of an actual furnace with an internal furnace volume of 4, raising the temperature for the heating time shown in Table 1, and then holding it at 1,750°C for 1,000 hours. This was done by examining changes. Comparative Example 1 A fibrous alumina heat insulating material was produced in the same manner except that alumina fibers (1 to 5 μm in diameter, 100 to 5000 mm in length) were used instead of magnesia whiskers. Table 1 shows the physical properties and heat resistance test results of the obtained fibrous alumina heat insulating material.
【表】
第１表より明らかなように、本発明の繊維状マ
グネシア断熱材は断熱性に優れ、しかも軽量であ
る。その上、耐熱性に著しく優れ、1650℃といつ
た超高温においても長時間安定に使用可能であ
る。
［発明の効果］
以上詳述した通り、請求項１の繊維状マグネシ
ア断熱材は、
耐熱使用温度が著しく高く、超高温炉等の断
熱材としても長時間安定して使用することがで
きる。
軽量で取り扱い性に優れる。
高強度で耐久性に優れる。
断熱性が著しく高い。
安価に提供することができる。
等の効果を有し、工業的に極めて有用である。
請求項２の繊維状マグネシア断熱材の製造方法
によれば、このような高特性繊維状マグネシア断
熱材を容易かつ効率的に製造することができる。[Table] As is clear from Table 1, the fibrous magnesia heat insulating material of the present invention has excellent heat insulating properties and is lightweight. Furthermore, it has excellent heat resistance and can be used stably for long periods of time even at extremely high temperatures of 1,650°C. [Effects of the Invention] As detailed above, the fibrous magnesia heat insulating material according to claim 1 has a significantly high heat resistance and can be stably used as a heat insulating material for ultra-high temperature furnaces and the like for a long period of time. Lightweight and easy to handle. High strength and durability. Extremely high insulation properties. It can be provided at low cost. It has the following effects and is extremely useful industrially. According to the method for producing a fibrous magnesia heat insulating material according to the second aspect, such a high-performance fibrous magnesia heat insulating material can be easily and efficiently produced.
Claims (1)
エルト状に成形した成形体を焼結してなることを
特徴とする繊維状マグネシア断熱材。 ２ マグネシアウイスカーを水又は水溶液に分散
懸濁し、得られた懸濁スラリーをブランケツト又
はフエルト状に脱水成形し、乾燥後、1500℃以上
の温度でウイスカーの表面同志を部分的に焼結さ
せることを特徴とする繊維状マグネシア断熱材の
製造方法。[Scope of Claims] 1. A fibrous magnesia heat insulating material, characterized in that it is made by sintering a molded article made by molding magnesia whiskers into a blanket or felt shape. 2. Magnesia whiskers are dispersed and suspended in water or an aqueous solution, the resulting suspended slurry is dehydrated and formed into a blanket or felt shape, and after drying, the surfaces of the whiskers are partially sintered at a temperature of 1500°C or higher. A method for producing a characteristic fibrous magnesia insulation material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63275416A JPH02124760A (en) | 1988-10-31 | 1988-10-31 | Fibrous magnesia heat insulating material and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63275416A JPH02124760A (en) | 1988-10-31 | 1988-10-31 | Fibrous magnesia heat insulating material and production thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02124760A JPH02124760A (en) | 1990-05-14 |
| JPH0555462B2 true JPH0555462B2 (en) | 1993-08-17 |
Family
ID=17555200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63275416A Granted JPH02124760A (en) | 1988-10-31 | 1988-10-31 | Fibrous magnesia heat insulating material and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02124760A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111117310B (en) * | 2020-01-19 | 2023-08-18 | 北京天佐消防产品有限公司 | Non-expansion type gypsum fireproof coating and preparation method thereof |
-
1988
- 1988-10-31 JP JP63275416A patent/JPH02124760A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02124760A (en) | 1990-05-14 |
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