JPH0383849A - Alumina dense sintered compact and its production - Google Patents
Alumina dense sintered compact and its productionInfo
- Publication number
- JPH0383849A JPH0383849A JP1220072A JP22007289A JPH0383849A JP H0383849 A JPH0383849 A JP H0383849A JP 1220072 A JP1220072 A JP 1220072A JP 22007289 A JP22007289 A JP 22007289A JP H0383849 A JPH0383849 A JP H0383849A
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- weight
- sintered compact
- dense sintered
- crucible
- 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000000843 powder Substances 0.000 claims abstract description 19
- 230000004907 flux Effects 0.000 claims abstract description 12
- 238000005245 sintering Methods 0.000 claims abstract description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 12
- 239000002184 metal Substances 0.000 abstract description 12
- 238000002844 melting Methods 0.000 abstract description 10
- 230000008018 melting Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 9
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract description 8
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 abstract description 6
- 150000002739 metals Chemical class 0.000 abstract description 6
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 abstract description 6
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 abstract description 6
- 229910001635 magnesium fluoride Inorganic materials 0.000 abstract description 3
- 239000011369 resultant mixture Substances 0.000 abstract 2
- 239000011819 refractory material Substances 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- 229910020854 La(OH)3 Inorganic materials 0.000 description 1
- 229910002249 LaCl3 Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910009253 Y(NO3)3 Inorganic materials 0.000 description 1
- 229910009454 Y(OH)3 Inorganic materials 0.000 description 1
- 229910009523 YCl3 Inorganic materials 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229940126214 compound 3 Drugs 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- -1 titanium group metals Chemical class 0.000 description 1
- PCMOZDDGXKIOLL-UHFFFAOYSA-K yttrium chloride Chemical compound [Cl-].[Cl-].[Cl-].[Y+3] PCMOZDDGXKIOLL-UHFFFAOYSA-K 0.000 description 1
- BXJPTTGFESFXJU-UHFFFAOYSA-N yttrium(3+);trinitrate Chemical compound [Y+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O BXJPTTGFESFXJU-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は金属溶解、化学反応容器、特殊耐化物等に用い
られるアルミナ焼結体に係り、特に耐食性に優れたアル
ミナ緻密焼結体及びその製造方法に間する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an alumina sintered body used for metal melting, chemical reaction vessels, special resistant materials, etc., and particularly relates to an alumina dense sintered body with excellent corrosion resistance and its Detailed manufacturing method.
［従来の技術及びその問題点コ
一般に金属溶解、化学反応容器等にはアルミナ坩堝が広
く用いられている。[Prior art and its problems] Generally, alumina crucibles are widely used for metal melting, chemical reaction vessels, etc.
しかしながら、従来のアルミナ坩堝を使用して、例えば
チタン族金属またはその合金等を溶解する際、これら金
属は非常に強い酸化力を有することに加えて高融点（１
Ｂ４Ｏ−１７００℃）であるため、坩堝の溶損が激しく
、溶損した坩堝成分及び酸素が溶解物中に混入して溶解
製品の純度を低下させ、また溶損された坩堝は数回の使
用で、溶損によるクラック、内面の剥がれ、変形等の現
象・が現れるという欠点がある。すなわちＡＩ、Ｎｉ、
Ｐｂ、Ｔｉ等活性な金属、若しくはＦ、ＣＩ、Ｂｒ等の
ハロゲン元素、若しくはＬｌ、Ｎａ、に等のアルカリ金
属を含む素材を溶解、あるいは焼成する工程において従
来のアルミナ焼結体では、坩堝等の容器、板、ブロック
等どの様な形状であれ耐食性において不十分であった。However, when using a conventional alumina crucible to melt, for example, titanium group metals or their alloys, these metals have very strong oxidizing power and high melting points (1
(B4O - 1700℃), the crucible is severely eroded, and the eroded crucible components and oxygen are mixed into the melt, reducing the purity of the melted product. However, it has the disadvantage that phenomena such as cracks, inner surface peeling, and deformation appear due to melting damage. That is, AI, Ni,
In the process of melting or firing materials containing active metals such as Pb and Ti, halogen elements such as F, CI, and Br, or alkali metals such as Ll, Na, etc., conventional alumina sintered bodies are used in crucibles, etc. Regardless of the shape of the container, plate, block, etc., corrosion resistance was insufficient.
そのため例えば金属溶解においてはアルミナ坩堝よりも
耐食性に優れたカルシア坩堝が用いられている。しかし
カルシア坩堝はアルミナ坩堝に比べて高価であるうえに
水分に弱く、保管が難しいという欠点がある。Therefore, for example, in metal melting, calcia crucibles, which have better corrosion resistance than alumina crucibles, are used. However, calcia crucibles have the disadvantage that they are more expensive than alumina crucibles, are sensitive to moisture, and are difficult to store.
本発明は上記事情を鑑みてなされたもので、耐食性に優
れたアルミナ緻密焼結体及びその製造方法を提供するこ
とを目的とする。The present invention was made in view of the above circumstances, and an object of the present invention is to provide a dense alumina sintered body having excellent corrosion resistance and a method for manufacturing the same.
［問題点を解決するための手段及びその作用］本発明者
は耐食性に優れたアルミナ焼結体を製造するために、ア
ルミナ粉末にフラックスとして数々の元素を添加し、実
験を重ねた結果、ＭｇＦ２、Ｌａ２Ｏ３、Ｚ ｒ ０２
、Ｙ ２０ ｇを適性に添加することによって緻密なア
ルミナ焼結体ができることを新たに見いだし本発明を處
すに至った。[Means for solving the problems and their effects] In order to produce an alumina sintered body with excellent corrosion resistance, the present inventor added various elements as flux to alumina powder, and as a result of repeated experiments, found that MgF2 , La2O3, Z r 02
The present inventors have newly discovered that a dense alumina sintered body can be produced by appropriately adding 20 g of Y.
本発明の製造方法は純度９９．９％以上の易焼結性アル
ミナ粉末を用意し、該アルミナ粉末にフラックスとして
Ｍ ｇ Ｆ ２を０．０５〜３． １重量％、及びＺｒ
Ｏ２を０．０１５〜３．０重量％、及びＬａ２Ｏ３を０
．００５〜０．０５重量％、及びＹ２Ｏ３を０．００５
〜０．０５重量％の範囲で添加することを特徴とする。In the production method of the present invention, easily sinterable alumina powder with a purity of 99.9% or more is prepared, and 0.05 to 3.0% of M g F 2 is added as a flux to the alumina powder. 1% by weight, and Zr
0.015 to 3.0% by weight of O2 and 0% of La2O3
．． 005-0.05% by weight, and 0.005% Y2O3
It is characterized in that it is added in an amount of 0.05% by weight.
次に前記混合物を水と通常の割合で湿式混合した後、バ
インダーとしてＰＶＡを対アルミナ粉末１．０重量％を
添加しスプレードライヤーにて造粒粉を作る。モして該
造粒粉を乾式プレス等の成形機を用いて成形した後１５
００〜１７００℃で２〜３時間焼結し目的とするアルミ
ナ緻密焼結体を得る。Next, the mixture is wet-mixed with water in a normal ratio, and then PVA is added as a binder in an amount of 1.0% by weight based on the alumina powder, and a granulated powder is produced using a spray dryer. After molding the granulated powder using a molding machine such as a dry press, 15
Sintering is performed at 00 to 1700°C for 2 to 3 hours to obtain the desired dense alumina sintered body.
本発明の製造方法において用いる易焼結性アルミナ粉末
の純度は特に制限するものではないが、９９．８％以上
のアルミナ純度を持っている方が好ましい。Although the purity of the easily sinterable alumina powder used in the production method of the present invention is not particularly limited, it is preferable that the alumina purity is 99.8% or more.
またフラックスとしては上記４種類のフラックスの他に
Ｍｇ化合物としてＭｇＣｌ２、Ｍｇ（Ｎ。In addition to the above four types of fluxes, Mg compounds such as MgCl2 and Mg(N) are used as fluxes.
３）２、ＭｇＯ等が使用できる。またＺｒ化合物として
Ｚ ｒ Ｃ１２、Ｚ ｒ Ｂ ｒ２、Ｚ ｒ Ｏ（ＮＯ
３） ２等、Ｌａ化合物としてＬ ａ （Ｎ Ｏ’ｓ）
３、ＬａＣｌ３、Ｌａ （ＯＨ）３等、Ｙ化合物とし
てＹ（ＮＯ３）３、ＹＣｌ３、Ｙ（ＯＨ）３等が使用で
きるが、好ましくは上記４種類のフラックスを使用する
。添加するフラックスの量はＭ ｇ Ｆ ２を０．０５
〜３．１重量％、゛好ましくはＯ０１〜１． ＯｆＥ
量％、及びＺｒＯ２を０．０６〜３．０重量％、好まし
くは０． １〜１．０重量％、及びＬａ２Ｏ３を０．
００５〜０゜０５重量％、好ましくは０．０１〜０．０
３重量％、及びＹ２Ｏ３を０．００５〜０．０５重量％
、好ましくは０．０１〜０．０３重量％の範囲で添加す
る。その理由はフラックスの量が上記範囲以下であると
緻密なアルミナ焼結体ができず、それ以上であると金属
等の溶解の際、フラックスが溶解し不純物となってしま
うからである。3) 2. MgO etc. can be used. In addition, as Zr compounds, Z r C12, Z r B r2, Z r O (NO
3) La (N O's) as a 2nd La compound
3, LaCl3, La(OH)3, etc., Y(NO3)3, YCl3, Y(OH)3, etc. can be used as the Y compound, but preferably the above four types of fluxes are used. The amount of flux added is M g F 2 0.05
~3.1% by weight, preferably O01~1. OfE
% by weight, and ZrO2 from 0.06 to 3.0% by weight, preferably 0. 1 to 1.0% by weight, and 0.0% of La2O3.
0.05 to 0.05% by weight, preferably 0.01 to 0.0
3% by weight, and 0.005-0.05% by weight of Y2O3
, preferably in an amount of 0.01 to 0.03% by weight. The reason for this is that if the amount of flux is less than the above range, a dense alumina sintered body cannot be formed, and if it is more than that, the flux will dissolve and become impurities when metals, etc. are melted.
またバインダーとしてはＰＶＡ、 ポリエチレン、ポ
リスチレン、アクリル系樹脂等の熱可塑性樹脂を好まし
く用いることか′（きる。As the binder, thermoplastic resins such as PVA, polyethylene, polystyrene, and acrylic resins are preferably used.
焼結する際の温度についても１３００〜２９００℃の温
度域で焼結可能であるが１５００〜１７００℃の温度域
で焼結する方がアルミナ焼結体により好ましい結果を与
えた。As for the temperature during sintering, it is possible to sinter in the temperature range of 1300 to 2900°C, but sintering in the temperature range of 1500 to 1700°C gave more preferable results for the alumina sintered body.
［作用コ
従来のアルミナ焼結体では前述したように、アルミナ面
に接する金属、ガス、蒸気等により侵され頻繁に交換し
なければならなかったが、本発明のアルミナ焼結体は緻
密で溶解金属との接触面の凹凸が少ないため侵され難く
、従来のアルミナ焼結体に比べ数倍の使用回数に耐える
ことができる。[Operations] As mentioned above, conventional alumina sintered bodies are attacked by metals, gases, steam, etc. that come into contact with the alumina surface and have to be replaced frequently, but the alumina sintered bodies of the present invention are dense and easily melted. Because there are few irregularities on the contact surface with metal, it is less susceptible to corrosion and can withstand several times the number of uses compared to conventional alumina sintered bodies.
以下実施例を示し、本発明を具体的に説明する。EXAMPLES The present invention will be specifically explained below with reference to Examples.
［実施例１コ
純度９９．９％、中心粒径０． ５μｍの易焼結性アル
ミナ粉末ＩＫｇにフラックスとしてＭｇＦ２を対アルミ
ナ粉末０．２重量％、ＺｒＯ２を同じ＜０．２重量％、
ｌ、ａ２０３を同じ＜ｏ、ｏｉｉｉ量％、Ｙ２Ｏ３を同
じ＜０．０１重量％添加し、バインダーとしてＰＶＡを
同じ＜１．０重量％添加して湿式混合を行いスラリー状
にした後、スプレードライヤーにて０． ５μｍの造粒
粉を得た。[Example 1 Purity 99.9%, center particle size 0. 5μm easily sinterable alumina powder IKg as a flux, MgF2 is 0.2% by weight relative to the alumina powder, ZrO2 is the same <0.2% by weight,
l, A203 in the same <o, oiii mass%, Y2O3 in the same <0.01% by weight, PVA as a binder in the same <1.0% by weight, wet mixed to form a slurry, and then dried in a spray dryer. At 0. Granulated powder of 5 μm was obtained.
次に金型２００ｍｍ口を使用して面圧１ｔ／ｃｍ２にて
乾式プレスを行い２００ｍｍ口Ｘ１５ｍｍｔの成形板を
作成した後、１６５０℃で３時間焼成することによって
密度３．９８ｇ／ｃｍ３のアルミナ緻密焼結板を得た。Next, dry pressing was performed using a 200 mm mold opening at a surface pressure of 1 t/cm2 to create a 200 mm opening x 15 mm t molded plate, which was then baked at 1650°C for 3 hours to form a dense alumina material with a density of 3.98 g/cm3. A sintered plate was obtained.
なお上記焼結板の耐食性は以下のように評価した。The corrosion resistance of the sintered plate was evaluated as follows.
酸化第１鉛１０ｇと水Ｊｏｇを混合しペースト状に練り
上げ、その混合物を本発明のアルミナ緻密焼結板と市販
の同じ大きさと厚みを持つアルミナ焼結板の上にそれぞ
れへらを用いて均一に塗布した後１２００℃で焼成した
。その操作を前記焼結板が割れるまで繰り返した。Mix 10 g of leadous oxide and Jog of water, knead it into a paste, and spread the mixture uniformly on the alumina sintered plate of the present invention and a commercially available alumina sintered plate having the same size and thickness using a spatula. After coating, it was baked at 1200°C. This operation was repeated until the sintered plate cracked.
その結果、本発明のアルミナ緻密焼結板は１０回の繰り
返し試験にも耐えたが、市販のアルミナ焼結板に至って
は、わずか３回目の試験で割れてしまった。この事より
本発明のアルミナ緻密焼結板は酸化第１鉛との反応性が
小さく、耐食性に優れたアルミナ焼結板である。As a result, the alumina dense sintered plate of the present invention withstood 10 repeated tests, but the commercially available alumina sintered plate broke after only the third test. As a result, the dense alumina sintered plate of the present invention has low reactivity with first lead oxide and is excellent in corrosion resistance.
［実施例２コ
実施例１で製造した造粒粉で今度は１００ｍｍφＸ １
００ｍｍｈ Ｘ ５ｍｍ ｔのシリンダー坩堝金型で、
Ｉｔ／ｃｍ２のラバープレス成形を行った後１６００℃
で２時間焼成を行いアルミナ坩堝を得た。[Example 2] The granulated powder produced in Example 1 was made with a diameter of 100 mmφ
00mmh x 5mmt cylinder crucible mold,
1600℃ after rubber press molding of It/cm2
The mixture was fired for 2 hours to obtain an alumina crucible.
また上記坩堝は今度は以下のように評価した。Moreover, the above crucible was evaluated as follows.
ＫＦ、 及びＮＨ４Ｃｌを１０ｇ１ アルミナ粉末２
００ｇを水５０ｇと混合しペースト状に練り上げ、その
混合物を本発明のアルミナ坩堝と同一の厚みで、同程度
の大きさの市販のアルミナ坩堝にそれぞれ加え、１２０
０℃で２時間焼成した。その操作を前記アルミナ坩堝に
クラックが入るまで繰り返した。KF, and NH4Cl 10g1 Alumina powder 2
00g was mixed with 50g of water and kneaded into a paste, and the mixture was added to commercially available alumina crucibles of the same thickness and size as the alumina crucible of the present invention.
It was baked at 0°C for 2 hours. This operation was repeated until a crack appeared in the alumina crucible.
その結果、本発明のアルミナ坩堝は実施例１と同じ＜１
０回の繰り返し試験にも耐えたが、市販のそれはわずか
２回目の試験でクラックが入ってしまった。As a result, the alumina crucible of the present invention has the same <1
It withstood 0 repeated tests, but the commercially available one cracked after only the second test.
［実施例３］
純度９９．９％、中心粒径０．６μｍの易焼結性アルミ
ナ粉末ＩＫｇにフラックスとしてＭｇＣｌ２を対アルミ
ナ粉末０．２重量％、ｚｒＯ２を同じ＜０．２重量％、
Ｌａ２Ｏ３を同じ＜０．０１重量％、Ｙ２Ｏ３を同じ＜
０．０１重量％添加し、バインダーとしてＰＶＡを同じ
＜１．０重量％添加して湿式混合を行いスラリー状にし
た後、スプレードライヤーにて０． ６μｍの造粒粉を
得た。[Example 3] IKg of easily sinterable alumina powder with a purity of 99.9% and a center particle size of 0.6 μm was mixed with 0.2% by weight of MgCl2 and 0.2% by weight of zrO2 based on the alumina powder as a flux.
La2O3 is the same <0.01% by weight, Y2O3 is the same <
0.01% by weight was added, and the same <1.0% by weight of PVA was added as a binder, wet mixing was performed to form a slurry, and 0.01% by weight was added using a spray dryer. Granulated powder of 6 μm was obtained.
該造粒粉を用い、実施例２と同じ＜１００ｍｍφＸ １
００ｍｍｈ Ｘ ５ｍｍ ｔのシリンダー坩堝金型で、
ｉｔ／ｃｍ２のラバープレス成形を行った後１６００℃
で２時間焼成を行いアルミナ坩堝を得た。Using the granulated powder, the same as Example 2<100mmφX 1
00mmh x 5mmt cylinder crucible mold,
1600℃ after rubber press molding of it/cm2
The mixture was fired for 2 hours to obtain an alumina crucible.
該アルミナ坩堝を実施例２と同様の操作によって評価し
た結果、本発明のアルミナ坩堝は７回目の繰り返し試験
でクラックが入ったが、市販のそれは実施例２と同じく
２回目の試験でクラックが入ってしまった。As a result of evaluating the alumina crucible by the same operation as in Example 2, it was found that the alumina crucible of the present invention cracked in the seventh repeated test, but the commercially available crucible cracked in the second test as in Example 2. It happened.
［発明の効果］
本発明のアルミナ緻密焼結体を用いることによって、た
とえば金属チタンの溶解に用いる坩堝では、従来では坩
堝を頻繁に交換しなければならなかったが数千回の連続
使舟にも耐えることが出来、また坩堝成分の溶損による
チタンの汚染も従来に比べて少なくすることができた。[Effects of the invention] By using the alumina dense sintered body of the present invention, crucibles used for melting titanium metal, for example, can be used several thousand times in a row, whereas conventional crucibles had to be replaced frequently. Furthermore, contamination of titanium due to melting of crucible components was reduced compared to conventional methods.
Claims (2)
．０５〜３．０重量％、Ｌａ＿２Ｏ＿３が０．００５〜
０．０５重量％及びＹ＿２Ｏ＿３が０．００５〜０．０
５重量％の範囲で含有されることを特徴とするアルミナ
緻密焼結体。(1) Mg is 0.02 to 1.2% by weight, ZrO_2 is 0
．． 05-3.0% by weight, La_2O_3 is 0.005-3.0% by weight
0.05% by weight and Y_2O_3 from 0.005 to 0.0
A dense sintered body of alumina, characterized in that the alumina content is in the range of 5% by weight.
＿２を０．０５〜３．１重量％、及びＺｒＯ＿２を０．
０５〜３．０重量％、及びＬａ＿２Ｏ＿３を０．００５
〜０．０５重量％、及びＹ＿２Ｏ＿３を０．００５〜０
．０５重量％の範囲で添加して成形した後、１５００〜
１７００℃の温度域で焼結することを特徴とするアルミ
ナ緻密焼結体の製造方法。(2) MgF as a flux in easily sinterable alumina powder
0.05 to 3.1% by weight of _2 and 0.05% to 3.1% by weight of ZrO_2.
05-3.0% by weight, and 0.005% La_2O_3
~0.05% by weight, and Y_2O_3 from 0.005 to 0
．． After adding in the range of 0.05% by weight and molding, the
A method for producing a dense alumina sintered body, characterized by sintering in a temperature range of 1700°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1220072A JPH0383849A (en) | 1989-08-26 | 1989-08-26 | Alumina dense sintered compact and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1220072A JPH0383849A (en) | 1989-08-26 | 1989-08-26 | Alumina dense sintered compact and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0383849A true JPH0383849A (en) | 1991-04-09 |
Family
ID=16745506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1220072A Pending JPH0383849A (en) | 1989-08-26 | 1989-08-26 | Alumina dense sintered compact and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0383849A (en) |
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|---|---|---|---|---|
| US20110021340A1 (en) * | 2009-07-24 | 2011-01-27 | Karl-Heinz Schofalvi | Refractory |
| US20120227445A1 (en) * | 2011-03-11 | 2012-09-13 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object, glass overflow forming block, and process for glass object manufacture |
| US9174874B2 (en) | 2011-03-30 | 2015-11-03 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object, glass overflow forming block, and process of forming and using the refractory object |
| US9216928B2 (en) | 2011-04-13 | 2015-12-22 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object including beta alumina and processes of making and using the same |
| US9249043B2 (en) | 2012-01-11 | 2016-02-02 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object and process of forming a glass sheet using the refractory object |
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| US11814317B2 (en) | 2015-02-24 | 2023-11-14 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory article and method of making |
-
1989
- 1989-08-26 JP JP1220072A patent/JPH0383849A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110021340A1 (en) * | 2009-07-24 | 2011-01-27 | Karl-Heinz Schofalvi | Refractory |
| US9714185B2 (en) | 2011-03-11 | 2017-07-25 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object, glass overflow forming block, and process for glass object manufacture |
| US20120227445A1 (en) * | 2011-03-11 | 2012-09-13 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object, glass overflow forming block, and process for glass object manufacture |
| TWI474986B (en) * | 2011-03-11 | 2015-03-01 | Saint Gobain Ceramics | Refractory object, glass overflow forming block, and process for glass object manufacture |
| US9073773B2 (en) * | 2011-03-11 | 2015-07-07 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object, glass overflow forming block, and process for glass object manufacture |
| US20150274568A1 (en) * | 2011-03-11 | 2015-10-01 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object, glass overflow forming block, and process for glass object manufacture |
| US9796630B2 (en) | 2011-03-30 | 2017-10-24 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object, glass overflow forming block, and process of forming and using the refractory object |
| US9174874B2 (en) | 2011-03-30 | 2015-11-03 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object, glass overflow forming block, and process of forming and using the refractory object |
| US9216928B2 (en) | 2011-04-13 | 2015-12-22 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object including beta alumina and processes of making and using the same |
| US9249043B2 (en) | 2012-01-11 | 2016-02-02 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object and process of forming a glass sheet using the refractory object |
| US9902653B2 (en) | 2012-01-11 | 2018-02-27 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object and process of forming a glass sheet using the refractory object |
| US10590041B2 (en) | 2012-01-11 | 2020-03-17 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object and process of forming a glass sheet using the refractory object |
| US11814317B2 (en) | 2015-02-24 | 2023-11-14 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory article and method of making |
| CN110770877A (en) * | 2017-06-13 | 2020-02-07 | 日本碍子株式会社 | Component for semiconductor manufacturing apparatus |
| CN110770877B (en) * | 2017-06-13 | 2024-06-18 | 日本碍子株式会社 | Component for semiconductor manufacturing device |
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