JPH0426541A - Manufacture of magnesia green compact and sintered body - Google Patents
Manufacture of magnesia green compact and sintered bodyInfo
- Publication number
- JPH0426541A JPH0426541A JP2126954A JP12695490A JPH0426541A JP H0426541 A JPH0426541 A JP H0426541A JP 2126954 A JP2126954 A JP 2126954A JP 12695490 A JP12695490 A JP 12695490A JP H0426541 A JPH0426541 A JP H0426541A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- magnesia
- parts
- molecular weight
- dispersant
- 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
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 239000002270 dispersing agent Substances 0.000 claims abstract description 35
- 239000002245 particle Substances 0.000 claims abstract description 26
- 239000003960 organic solvent Substances 0.000 claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000005245 sintering Methods 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000005266 casting Methods 0.000 abstract description 12
- 238000000465 moulding Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 3
- 229920000642 polymer Polymers 0.000 abstract description 3
- 239000010419 fine particle Substances 0.000 abstract 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- -1 carboxylic acid sodium salts Chemical class 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011505 plaster Substances 0.000 description 2
- 229920000768 polyamine Polymers 0.000 description 2
- 239000011164 primary particle Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000005456 alcohol based solvent Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000003849 aromatic solvent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000005453 ketone based solvent Substances 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 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
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000007582 slurry-cast process Methods 0.000 description 1
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical compound CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 239000008096 xylene Substances 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）
本発明は、平均粒径１ａｍ以下のマグネシア微粉末を用
いて、鋳込成形によりマグネシア成形体及び焼結体を製
造する方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing magnesia molded bodies and sintered bodies by cast molding using fine magnesia powder having an average particle size of 1 am or less.
（従来技術およびその問題点）
高純度マグネシア焼結体は、酸化雰囲気中での耐熱性に
優れると共に、酸化鉛やアルカリに対する耐蝕性に優れ
るため、ＰＺＴ等の電子セラミンク材料やβ−アルミナ
などの焼成用のセンタールツボ、タンマン管としての用
途がある。(Prior art and its problems) High-purity magnesia sintered bodies have excellent heat resistance in oxidizing atmospheres and corrosion resistance against lead oxide and alkalis. It is used as a center crucible for firing and a Tammann tube.
このような用途に使われる容器は、プレス成形による製
造は困難であるため、鋳込み成形によって作られている
。Containers used for such purposes are manufactured by casting, since it is difficult to manufacture by press molding.
この鋳込み成形では、特開平１−３０１５５８号公報に
記載されているように、平均粒径が１μｍよりも大きい
マグネシア粉末を原料としていた。しかじな々（ら、前
記原料粉末は焼結性に劣るため、焼結助剤を添加しなけ
ればならず、このため高純度のマグネシア焼結体は得ら
れなかった。In this cast molding, as described in JP-A-1-301558, magnesia powder having an average particle size of more than 1 μm was used as a raw material. However, since the raw material powder has poor sinterability, a sintering aid must be added, and for this reason, a highly pure magnesia sintered body could not be obtained.
また、鋳込み成形では、成形体にクラックが発生するの
を防ぐため、バインダーを添加しているが、バインダー
が溶媒に溶けて溶媒の粘度を上げるため、鋳込み速度が
遅くなり、成形時間が長くなる問題もあった。In addition, in casting molding, a binder is added to prevent cracks from forming in the molded product, but the binder dissolves in the solvent and increases the viscosity of the solvent, slowing down the casting speed and lengthening the molding time. There were also problems.
（発明の目的）
本発明の目的は、前記問題点を解決し、平均粒径ｌｕｍ
以下のマグネシア微粉末を原料として鋳込み成形により
成形体を製造する方法、さらには、高純度マグネシアの
特性を損なわず緻密化された焼結体製品を製造する方法
を提供するものである。(Objective of the Invention) The object of the present invention is to solve the above-mentioned problems and increase the average particle size lum.
The present invention provides a method for manufacturing a molded body by casting using the following fine magnesia powder as a raw material, and a method for manufacturing a densified sintered product without impairing the characteristics of high-purity magnesia.
（問題点を解決するための手段）
本発明は、平均分子量１０，０００未満の液体状分散剤
０３０１〜４．０重量部及び平均分子量１０，０００以
上で有機溶媒に可溶な固体状高分子系分散剤０．５〜４
．０重量部を有機溶媒２５〜６０重量部と混合した後、
平均粒径１μｍ以下のマグネシア微粉末１００重量部を
加えて泥漿を調製し、これを鋳込み成形することを特徴
とするマグネシア成形体の製造方法、
及び、前記方法で得られたマグネシア成形体を酸化性雰
囲気下で焼結することを特徴とするマグネシア焼結体の
製造方法に関するものである。(Means for Solving the Problems) The present invention provides 0.301 to 4.0 parts by weight of a liquid dispersant having an average molecular weight of less than 10,000 and a solid polymer having an average molecular weight of 10,000 or more and soluble in an organic solvent. System dispersant 0.5-4
．． After mixing 0 parts by weight with 25 to 60 parts by weight of an organic solvent,
A method for manufacturing a magnesia molded body, which comprises adding 100 parts by weight of fine magnesia powder with an average particle size of 1 μm or less to prepare a slurry, and casting the slurry, and oxidizing the magnesia molded body obtained by the method. The present invention relates to a method for producing a magnesia sintered body, which is characterized by sintering in a neutral atmosphere.
本発明において、平均分子量１０，０００未満の液体状
分散剤としては、常温で液体状の分散剤であればよく、
例えば、トリエチルアミン、トリブチルアミン、ポリエ
チリンポリアミン等のアミン系分散剤、ポリエチレンオ
キサイド等のポリエチレンオキサイド系分散剤、カルボ
ン酸ナトリウム塩、カルボン酸アンモニウム塩等のカル
ボン酸系分散剤等が用いられる。In the present invention, the liquid dispersant having an average molecular weight of less than 10,000 may be any dispersant that is liquid at room temperature.
For example, amine-based dispersants such as triethylamine, tributylamine, and polyethyline polyamine, polyethylene oxide-based dispersants such as polyethylene oxide, and carboxylic acid-based dispersants such as carboxylic acid sodium salts and carboxylic acid ammonium salts are used.
また、平均分子量１０．０００以上で有機溶媒に可溶な
固体状高分子系分散剤としては、常温で固体状の分散剤
であればよく、例えば、スチレン−マレイン酸共重合体
等のポリカルボン酸系分散剤、ポリエチレンオキサイド
等のポリエチレンオキサイド系分散剤、ポリアクリル酸
エステル−アクリル酸共重合体等のポリエステル系分散
剤等が用いられる。Further, the solid polymeric dispersant having an average molecular weight of 10.000 or more and being soluble in organic solvents may be any dispersant that is solid at room temperature, such as polycarbonate such as styrene-maleic acid copolymer. Acid dispersants, polyethylene oxide dispersants such as polyethylene oxide, polyester dispersants such as polyacrylic ester-acrylic acid copolymers, etc. are used.
有機溶媒としては、メタノール、エタノール等のアルコ
ール系溶媒、トルエン、キシレン等の芳香族系溶媒、メ
チルエチルケトン、シクロヘキサノン等のケトン系溶媒
等が好ましい。Preferred organic solvents include alcohol solvents such as methanol and ethanol, aromatic solvents such as toluene and xylene, and ketone solvents such as methyl ethyl ketone and cyclohexanone.
また、本発明におけるマグネシア粉末としては、純度９
９．９％以上で平均粒径１μｍ以下の高純度マグネシア
微粉末が用いられる。このようなマグネシア粉末として
は、マグネシウム蒸気の気相酸化法により得られるマグ
ネシア微粉末が好適である。特に、特開平１−２８２１
４６号公報に記載されているマグネシア微粉末が好まし
い。前記公報によれば、マグネシウム蒸気をノズルから
酸素含有雰囲気中に噴出し、長さｌｏＣｌｌ以上の層流
拡散火炎を形成させ、該火炎中でマグネシウム蒸気を酸
化させることにより、粒径０．１〜１．０μｍの立方体
状の一次粒子を３０〜８０重量％含み、残部が粒径０．
１μｍ以下の等軸状の一次粒子からなるマグネシア微粉
末が得られる。前記公報の記載は本発明の一部として参
照される。In addition, the magnesia powder in the present invention has a purity of 9
High-purity magnesia fine powder having a content of 9.9% or more and an average particle size of 1 μm or less is used. As such magnesia powder, fine magnesia powder obtained by a vapor phase oxidation method of magnesium vapor is suitable. In particular, JP-A-1-2821
Magnesia fine powder described in Japanese Patent No. 46 is preferred. According to the above publication, magnesium vapor is ejected from a nozzle into an oxygen-containing atmosphere to form a laminar diffusion flame with a length of loCll or more, and by oxidizing the magnesium vapor in the flame, particles with a particle size of 0.1 to Contains 30 to 80% by weight of cubic primary particles with a diameter of 1.0 μm, and the remainder has a particle size of 0.5 μm.
Magnesia fine powder consisting of equiaxed primary particles of 1 μm or less is obtained. The descriptions in the above publications are referred to as part of the present invention.
マグネシア粉末の平均粒径が１μｍより大きくなると、
焼結の駆動力となる表面エネルギーが小さくなるため、
緻密な焼結体が得られない。また、緻密な焼結体を得よ
うとすれば、焼結助剤を添加しなければならず、高純度
のマグネシア焼結体が得られないので好ましくない。When the average particle size of magnesia powder is larger than 1 μm,
Because the surface energy that is the driving force for sintering becomes smaller,
A dense sintered body cannot be obtained. Furthermore, in order to obtain a dense sintered body, a sintering aid must be added, which is not preferable because a highly pure magnesia sintered body cannot be obtained.
本発明においては、まず平均分子量１０，０００未満の
液体状分散剤０．０１〜４．０重量部及び平均分子量１
０，０００以上で有機溶媒に可溶な固体状高分子系分散
剤０．５〜４．０重量部を有機溶媒２５〜６０重量部と
混合した後、平均粒径１μｍ以下のマグネシア微粉末１
００重量部を加えて泥漿を調製する。In the present invention, first, 0.01 to 4.0 parts by weight of a liquid dispersant having an average molecular weight of less than 10,000 and an average molecular weight of 1
After mixing 0.5 to 4.0 parts by weight of a solid polymeric dispersant soluble in an organic solvent with a molecular weight of 0,000 or more and 25 to 60 parts by weight of an organic solvent, fine magnesia powder 1 with an average particle size of 1 μm or less is mixed.
A slurry is prepared by adding 00 parts by weight.
一般に、粒径の小さい粒子を分散させるには、分子量の
小さい分散剤を用い、粒径の大きい粒子を分散させるに
は、分子量の大きい分散剤を用いる。本発明においては
、分散剤としては、平均分子量１０，０００未満の液体
状分散剤を用いることにより、平均粒径１μｍ以下の粒
子からなるマグネシア粉末が良好に分散される。Generally, a dispersant with a small molecular weight is used to disperse particles with a small particle size, and a dispersant with a large molecular weight is used to disperse particles with a large particle size. In the present invention, by using a liquid dispersant having an average molecular weight of less than 10,000, magnesia powder consisting of particles with an average particle size of 1 μm or less is well dispersed.
また、平均分子量ｉｏ、ｏｏｏ以上で有機溶媒に可溶な
固体状高分子系分散剤を用いることにより、バインダー
としての効果が得られる。さらに高分子系分散剤は、マ
グネシア粒子に吸着しているので、有機溶媒の粘度を上
げないため、鋳込み速度を遅くすることがない。そして
、成形体の乾燥中に有機溶媒が除去されると、固体状に
なりマグネシア粒子同士を結合させる効果が発揮される
。Further, by using a solid polymeric dispersant having an average molecular weight of io, ooo or more and soluble in an organic solvent, an effect as a binder can be obtained. Furthermore, since the polymeric dispersant is adsorbed on the magnesia particles, it does not increase the viscosity of the organic solvent, so it does not slow down the casting speed. When the organic solvent is removed during drying of the molded product, the molded product becomes solid and exhibits the effect of bonding magnesia particles together.
平均分子量１０，０００未満の液体状分散剤を単独で用
いた場合は、マグネシア粒子同士を結合できないため、
成形体にクラックが発生する。また平均分子量１０．０
００以上で有機溶媒に可溶な固体状高分子系分散剤を単
独で用いた場合は、マグネシア粒子の分散が不十分なた
め、成形体密度が低くなり、成形体にクラックが発生す
るので好ましくない。If a liquid dispersant with an average molecular weight of less than 10,000 is used alone, magnesia particles cannot be bonded together, so
Cracks occur in the molded body. Also, average molecular weight 10.0
If a solid polymeric dispersant having a molecular weight of 00 or higher and soluble in an organic solvent is used alone, the magnesia particles will not be sufficiently dispersed, resulting in a low density of the molded product and cracks in the molded product, so this is not preferred. do not have.
本発明においては、前記マグネシア粉末及び分散剤から
なる組成物を、例えばボールミルによって混合・解砕す
ることによって鋳込み成形用泥漿を製造することができ
る。In the present invention, a slurry for casting can be produced by mixing and crushing a composition comprising the magnesia powder and a dispersant using, for example, a ball mill.
次いで、この泥漿を脱泡後、所定の形状の石膏型を用い
、排泥鋳込み成形、固形鋳込み成形、加圧鋳込み成形等
により、任意の形状の成形体とすることができる。Next, after degassing this slurry, it can be made into a molded body of any shape by using a plaster mold of a predetermined shape and performing slurry casting, solid casting, pressure casting, etc.
このようにして得られた成形体は、平均分子量ｉｏ、ｏ
ｏｏ以上の固体状高分子系分散剤がバインダーとして粒
子同士を結合するため、割れが起こり難く、大型あるい
は複雑形状品が容易に得られる。The molded product thus obtained has an average molecular weight of io, o
Since the solid polymeric dispersant with a molecular weight of 0 or more acts as a binder and binds the particles together, cracks are less likely to occur, and large-sized or complex-shaped products can be easily obtained.
本発明においては、前記成形体を酸化性雰囲気下に焼結
することにより、高純度のマグネシア焼結体が得られる
。焼結は、空気中で１５００〜１８００°Ｃの温度で行
うことにより、緻密な焼結体が得られる。In the present invention, a highly pure magnesia sintered body can be obtained by sintering the molded body in an oxidizing atmosphere. By performing sintering in air at a temperature of 1500 to 1800°C, a dense sintered body can be obtained.
（実施例）
以下に実施例及び比較例を示し、本発明をさらに具体的
に説明する。(Example) Examples and comparative examples are shown below to further specifically explain the present invention.
実施例１
エタノール４５重量部に、分散剤として平均分子量１５
．０００のスチレン−マレイン酸共重合体を１重量部及
び平均分子量２．０００のポリエチレンポリアミンを１
重量部加えて混合し、さらにマグネシア粉末（宇部興産
■製置純度超微粉単結晶マグネシア２０００Ａ）を１０
０Ｍ量部添加した後、４８時間ボールミルして、鋳込み
成形用泥漿を調製した。Example 1 45 parts by weight of ethanol was added with an average molecular weight of 15 as a dispersant.
．． 000 styrene-maleic acid copolymer and 1 part by weight of polyethylene polyamine having an average molecular weight of 2.000.
Add 10 parts by weight and mix, and then add 10 parts of magnesia powder (Ube Industries ultra-fine powder single crystal magnesia 2000A).
After adding 0M part, ball milling was carried out for 48 hours to prepare a slurry for casting.
この泥漿を脱泡した後、１００φＸ５Ｑｈｍの石膏型に
注ぎ込み、５ｍの肉厚まで着肉させてから、排泥した。After degassing this slurry, it was poured into a plaster mold of 100 φ x 5 Qhm, and the slurry was molded to a thickness of 5 m, and then the slurry was drained.
２４時間放置してから脱型し、着肉体を室温で２４時間
乾燥させた後、６０°Ｃで５特間乾燥して成形体を得た
。得られた成形体の密度は５５％であった。After being left for 24 hours, the mold was removed, and the molded body was dried at room temperature for 24 hours, and then dried at 60°C for 5 hours to obtain a molded body. The density of the obtained molded body was 55%.
次に、得られた成形体を常圧大気下において１６５０°
Ｃで４時間焼成した。これにより、８２φＸ４１ ｈＸ
４ Ｌ閣で密度９９％の焼結体が得られた。Next, the obtained molded body was heated at 1650° under normal pressure atmosphere.
It was baked at C for 4 hours. As a result, 82φX41hX
A sintered body with a density of 99% was obtained using 4L.
実施例２
分散剤として、平均分子量２０．０００のポリエチレン
オキサイドを１重量部及び平均分子量１，０００のポリ
エチレンオキサイドを０．５重量部用いたほかは実施例
１と同様にして成形体及び焼結体を製造した。Example 2 A molded body and sintering were carried out in the same manner as in Example 1, except that 1 part by weight of polyethylene oxide with an average molecular weight of 20.000 and 0.5 part by weight of polyethylene oxide with an average molecular weight of 1,000 were used as the dispersant. manufactured the body.
得られた成形体の密度は５９％であり、焼結体は、８４
φＸ４２ ｈＸ４ ｔ■で密度９９％であった。The density of the obtained compact was 59%, and the density of the sintered compact was 84%.
The density was 99% at φX42 hX4 t■.
比較例１
分散剤として、平均分子量１，０００のポリエチレンオ
キサイドを０．５重量部用いたほかは実施例１と同様に
して成形体を製造した。Comparative Example 1 A molded article was produced in the same manner as in Example 1, except that 0.5 parts by weight of polyethylene oxide having an average molecular weight of 1,000 was used as a dispersant.
得られた成形体の密度は６５％であったが、成形体にク
ラックが発生した。Although the density of the obtained compact was 65%, cracks occurred in the compact.
比較例２
分散剤として、平均分子量２０．０００のスチレンマレ
イン酸共重合体を２重量部用いたほかは実施例１と同様
にして成形体を製造した。Comparative Example 2 A molded article was produced in the same manner as in Example 1, except that 2 parts by weight of a styrene-maleic acid copolymer having an average molecular weight of 20.000 was used as a dispersant.
得られた成形体の密度は４８％であったが、成形体にク
ランクが発生した。Although the density of the obtained molded product was 48%, cranks occurred in the molded product.
Claims (2)
０１〜４．０重量部及び平均分子量１０，０００以上で
有機溶媒に可溶な固体状高分子系分散剤０．５〜４．０
重量部を有機溶媒２５〜６０重量部と混合した後、平均
粒径１μｍ以下のマグネシア微粉末１００重量部を加え
て泥漿を調製し、これを鋳込み成形することを特徴とす
るマグネシア成形体の製造方法。(1) Liquid dispersant with an average molecular weight of less than 10,000 0.
01 to 4.0 parts by weight and a solid polymeric dispersant having an average molecular weight of 10,000 or more and soluble in an organic solvent, 0.5 to 4.0 parts by weight.
After mixing parts by weight with 25 to 60 parts by weight of an organic solvent, 100 parts by weight of fine magnesia powder with an average particle size of 1 μm or less is added to prepare a slurry, and the slurry is cast and molded. Method.
０１〜４．０重量部及び平均分子量１０，０００以上で
有機溶媒に可溶な固体状高分子系分散剤０．５〜４．０
重量部を有機溶媒２５〜６０重量部に加えて混合した後
、平均粒径１μｍ以下のマグネシア微粉末１００重量部
を加えて泥漿を調製し、これを鋳込み成形し、得られた
成形体を酸化性雰囲気下で焼結することを特徴とするマ
グネシア焼結体の製造方法。(2) Liquid dispersant with an average molecular weight of less than 10,000 0.
01 to 4.0 parts by weight and a solid polymeric dispersant having an average molecular weight of 10,000 or more and soluble in an organic solvent, 0.5 to 4.0 parts by weight.
After adding and mixing parts by weight with 25 to 60 parts by weight of an organic solvent, 100 parts by weight of fine magnesia powder with an average particle size of 1 μm or less was added to prepare a slurry, which was cast and molded, and the resulting molded body was oxidized. A method for producing a magnesia sintered body, characterized by sintering in a neutral atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2126954A JPH0426541A (en) | 1990-05-18 | 1990-05-18 | Manufacture of magnesia green compact and sintered body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2126954A JPH0426541A (en) | 1990-05-18 | 1990-05-18 | Manufacture of magnesia green compact and sintered body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0426541A true JPH0426541A (en) | 1992-01-29 |
Family
ID=14948012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2126954A Pending JPH0426541A (en) | 1990-05-18 | 1990-05-18 | Manufacture of magnesia green compact and sintered body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0426541A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007065245A (en) * | 2005-08-31 | 2007-03-15 | Canon Inc | Toner |
| JP2007261911A (en) * | 2006-03-29 | 2007-10-11 | Nof Corp | Slurry composition for ceramic production |
-
1990
- 1990-05-18 JP JP2126954A patent/JPH0426541A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007065245A (en) * | 2005-08-31 | 2007-03-15 | Canon Inc | Toner |
| JP4603958B2 (en) * | 2005-08-31 | 2010-12-22 | キヤノン株式会社 | toner |
| JP2007261911A (en) * | 2006-03-29 | 2007-10-11 | Nof Corp | Slurry composition for ceramic production |
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