JPH0324269B2 - - Google Patents
Info
- Publication number
- JPH0324269B2 JPH0324269B2 JP9420784A JP9420784A JPH0324269B2 JP H0324269 B2 JPH0324269 B2 JP H0324269B2 JP 9420784 A JP9420784 A JP 9420784A JP 9420784 A JP9420784 A JP 9420784A JP H0324269 B2 JPH0324269 B2 JP H0324269B2
- Authority
- JP
- Japan
- Prior art keywords
- protective film
- stalk
- ceramic
- aluminum
- coating agent
- 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
Links
- 230000001681 protective effect Effects 0.000 claims description 17
- 239000000919 ceramic Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052622 kaolinite Inorganic materials 0.000 claims description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- 239000004111 Potassium silicate Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 3
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 229910052782 aluminium Inorganic materials 0.000 description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 11
- 229910052742 iron Inorganic materials 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 230000007774 longterm Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 229910052839 forsterite Inorganic materials 0.000 description 2
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 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
- 239000000843 powder Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
【発明の詳細な説明】
この発明は、金属物体に耐熱性を付与するため
に、金属物体表面にセラミツク状の保護膜を形成
するセラミツク状保護膜形成方法、特にホルステ
ライトをを用いたセラミツク状保護膜形成方法に
関する。DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for forming a ceramic protective film on the surface of a metal object in order to impart heat resistance to the metal object. This invention relates to a protective film forming method.
従来、例えばアルミニウムの精密鋳造の技術に
おいて、ストークが使用されている。このストー
クは一般には鉄で形成されている。ここで、アル
ミニウムの融点は約660℃であるのに対し、鉄の
融点は約1539℃とアルミニウムより高い。従つ
て、溶融アルミニウムが通過するストークが鉄製
であれば、一見すれば何ら問題が存在しないよう
に思える。しかしながら、現実には、溶融アルミ
ニウムがストークを長時間に渡つて通過している
と、いわゆる鉄の食われ現象が生じることにな
り、ストークの強度が弱められると共に、食われ
た鉄がアルミニウム中に溶け出すことになる。こ
のアルミニウム中に溶け出した鉄は、製品を不良
とし、歩留りが非常に悪くなつていた。 Conventionally, stalks have been used, for example, in the technology of precision casting of aluminum. This stalk is generally made of iron. Here, the melting point of aluminum is approximately 660°C, while the melting point of iron is approximately 1539°C, which is higher than aluminum. Therefore, if the stalk through which molten aluminum passes is made of iron, it seems that there is no problem at first glance. However, in reality, when molten aluminum passes through a stalk for a long period of time, a so-called iron erosion phenomenon occurs, which weakens the strength of the stalk and causes the eaten iron to be absorbed into the aluminum. It will start to melt. This iron dissolved into the aluminum made the product defective and the yield was extremely low.
このため、ストークの内表面にセラミツク膜を
水ガラス接着剤を用いて接着し、ストークに耐熱
性を付与する技術が開発されている。しかし、鉄
の熱膨張率とセラミツクの熱膨張率と接着剤の熱
膨張率との違いにより、熱衝撃に弱く、長時間に
渡つて使用に耐え得る状態ではない。 For this reason, a technique has been developed in which a ceramic film is bonded to the inner surface of the stalk using a water glass adhesive to impart heat resistance to the stalk. However, due to the difference in coefficient of thermal expansion between iron, ceramic, and adhesive, it is susceptible to thermal shock and cannot be used for long periods of time.
このように、従来のストークは、いわば使い棄
ての状態におかれ、材料費、取り換え費用等、費
用が多大にかかるものであり、経済性が悪く、改
善がが強く要望されていた。 As described above, conventional stalks are in a disposable state, and require a large amount of cost in terms of material costs, replacement costs, etc., and are not economically viable, so improvements have been strongly desired.
この発明は上記事情に鑑みなされたもので、こ
の発明の目的は、金物物体に耐熱性を与え高温下
にあつても長時間の使用に耐え得ることのできる
セラミツク状保護膜の形成方法を提供することで
ある。 This invention was made in view of the above circumstances, and an object of the invention is to provide a method for forming a ceramic-like protective film that imparts heat resistance to metal objects and can withstand long-term use even under high temperatures. It is to be.
以下に、この発明に係るセラミツク状保護膜形
成方法の一実施例を、ストークの内表面に形成す
る場合に適用して、詳細に説明する。 Hereinafter, one embodiment of the method for forming a ceramic protective film according to the present invention will be described in detail as applied to the case where it is formed on the inner surface of a stalk.
まず、ホルステライトを粉体に砕く。ここで好
ましくは150メツシユ以下の粉体に砕く。このよ
うに粉体にしたホルステライトに、酸化アルミニ
ウムと圭素との化合物であるカオリナイトを重量
比10％乃至30％で混入する。ここで好ましくはホ
ルステライトとカオリナイトとの混合重量比は
５：１である。また、カオリナイトとしては、キ
ブシ粘土やカワズメ粘土等が用いられる。このカ
オリナイトは、接着力の向上やホルステライトの
粒子間の密着度の向上の為に用いられる。 First, the holsterite is crushed into powder. Here, it is preferably crushed into a powder of 150 mesh or less. Kaolinite, which is a compound of aluminum oxide and ions, is mixed into the powdered forsterite in a weight ratio of 10% to 30%. Preferably, the mixing weight ratio of holsterite and kaolinite is 5:1. Further, as the kaolinite, Kibushi clay, Kawazume clay, etc. are used. This kaolinite is used to improve adhesive strength and the degree of adhesion between particles of holsterite.
次に、接着剤としてのバインダを準備する。 Next, a binder as an adhesive is prepared.
このバインダは硅酸ソーダを３、硅酸カリを
２、コロイダル硅酸ソーダを５、水を12の各分量
で混入したものを更に水で２乃至３倍に希釈して
形成する。このようにして形成したバインダとホ
ルステライト／カオリナイト混合物とを６：４乃
至７：３で混合し、良く攪拌して、泥状の塗布剤
を形成する。 This binder is formed by mixing 3 parts of sodium silicate, 2 parts of potassium silicate, 5 parts of colloidal sodium silicate, and 12 parts of water, and further diluting the mixture 2 to 3 times with water. The binder thus formed and the forsterite/kaolinite mixture are mixed in a ratio of 6:4 to 7:3 and stirred well to form a slurry-like coating agent.
一方、この発明の特徴を構成する工程である
が、金属物体としてのストークを予め150℃乃至
200℃までに加熱しておく。このように加熱して
おいたストークの表面に、既に形成しておいた塗
布剤を塗布する。このように塗布することによ
り、塗布剤の水分は蒸発し、ストークの表面に密
着すると共に固化することになる。即ち、セラミ
ツク状の保護膜が形成される。ここで、保護膜の
膜厚は１乃至３mmが効果的である。 On the other hand, this is a step that constitutes the feature of this invention, but the stalk as a metal object is preheated to 150°C.
Heat to 200℃. The previously formed coating agent is applied to the surface of the stalk that has been heated in this way. By applying the coating in this manner, the moisture in the coating agent evaporates, and the coating agent adheres closely to the surface of the stalk and solidifies. That is, a ceramic-like protective film is formed. Here, the effective thickness of the protective film is 1 to 3 mm.
このようにして形成されたセラミツク状保護膜
はアルミニウムに対して安定であり、アルミニウ
ムの鋳造に好適すると共に、接着剤の層を介して
ストーク表面に接着されているのではなく、保護
膜自身が接着されている状態が実現される。従つ
て、密着度がよく、熱衝撃に強い、アルミニウム
湯に対して化学変化せず安定なセラミツク状保護
膜が提供される。このようなセラミツク状保護膜
は、長期間の使用に耐え、従来のように、ストー
クを消耗品とする事なく、経済的に優れたものと
なる。 The ceramic-like protective film formed in this way is stable to aluminum, making it suitable for aluminum casting, and the protective film itself is not bonded to the stalk surface via a layer of adhesive. A bonded state is achieved. Therefore, a ceramic protective film is provided which has good adhesion, is resistant to thermal shock, and is stable against aluminum hot water without chemical change. Such a ceramic protective film can withstand long-term use and is economically superior since the stalk does not have to be a consumable item as in the past.
この発明は、上述した一実施例の方法に限定さ
れる事なく、この発明の趣旨を逸脱しない範囲で
種々変形可能である。例えば、このセラミツク状
保護膜の形成対象としての金属物体としてストー
クを用いて説明したが、この発明はストークを対
象として限定されるものでなく、例えば、溶融ア
ルミニウムの温度を測定するための温度計の保護
膜としても適用され、更には、るつぼの保護膜と
しても適用され得る。ここでるつぼに適用した場
合、従来、るつぼは、耐熱性を理由として高価な
黒鉛で形成されていたものが、鉄により形成され
得るようになり、廉価になる効果が得られる。 This invention is not limited to the method of the embodiment described above, and can be modified in various ways without departing from the spirit of the invention. For example, although the description has been made using a stalk as the metal object on which the ceramic-like protective film is formed, the present invention is not limited to the stalk, and may be used, for example, as a thermometer for measuring the temperature of molten aluminum. Furthermore, it can be applied as a protective film for a crucible. When applied to a crucible, the crucible was conventionally made of graphite, which was expensive due to its heat resistance, but now it can be made of iron, resulting in a lower cost.
その他、前述した一実施例における説明で用い
た数値は一例であつて、条件等によつてその範囲
が変動する事は言うまでもない。 In addition, the numerical values used in the explanation of the above-mentioned embodiment are merely examples, and it goes without saying that the range varies depending on conditions and the like.
以上詳述したように、この発明に係るセラミツ
ク状保護膜成形方法は、ホルステライトを所定の
粒度に粉砕し、これをカオリナイトを混合し、更
に、硅酸ソーダと硅酸カリとコロイダル硅酸ソー
ダと水とからなるバインダを混入して形成された
塗布剤を、所定の温度に加熱された金属物体の表
面に塗布する事によりセラミツク状の保護膜を形
成する事を特徴としている。従つて、この発明に
よれば、金属物体に耐熱性を与え、高温下にあつ
ても長時間の使用に耐え得ることのできるセラミ
ツク状保護膜形成方法が提供される。 As detailed above, the method for forming a ceramic protective film according to the present invention involves pulverizing holsterite to a predetermined particle size, mixing this with kaolinite, and then adding sodium silicate, potassium silicate, and colloidal silicate. It is characterized by forming a ceramic-like protective film by applying a coating agent mixed with a binder consisting of soda and water to the surface of a metal object heated to a predetermined temperature. Therefore, according to the present invention, there is provided a method for forming a ceramic protective film that imparts heat resistance to a metal object and can withstand long-term use even under high temperatures.
Claims (1)
をカオリナイトと混合し、この混合物に硅酸ソー
ダと硅酸カリとコロイダル硅酸ソーダと水とから
なるバインダを混入し塗布剤を形成し、この塗布
剤を所定の温度に加熱した金属物体の表面に塗布
することによりセラミツク状保護膜を形成するこ
とを特徴とするセラミツク状保護膜形成方法。1 Grind holsterite to a predetermined particle size, mix it with kaolinite, mix a binder consisting of sodium silicate, potassium silicate, colloidal sodium silicate, and water to form a coating agent. A method for forming a ceramic protective film, which comprises forming a ceramic protective film by applying a coating agent to the surface of a metal object heated to a predetermined temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9420784A JPS60238488A (en) | 1984-05-11 | 1984-05-11 | Formation of ceramic protective film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9420784A JPS60238488A (en) | 1984-05-11 | 1984-05-11 | Formation of ceramic protective film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60238488A JPS60238488A (en) | 1985-11-27 |
| JPH0324269B2 true JPH0324269B2 (en) | 1991-04-02 |
Family
ID=14103857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9420784A Granted JPS60238488A (en) | 1984-05-11 | 1984-05-11 | Formation of ceramic protective film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60238488A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2701273B1 (en) * | 1993-02-05 | 1995-04-28 | Daussan & Co | Method for producing a protective coating on iron-based tools intended to be brought into contact with a molten metal or ferrous alloy, coating thus obtained and tool comprising such a coating. |
| KR100312796B1 (en) * | 1999-03-13 | 2001-11-03 | (주)석경에이.티 | Ambient Temperature Curing Inorganic Binder Composition Comprising Colloid Silica Sol Catalyst, and Method of Treating Porous Structure Using the Same |
| KR20010099374A (en) * | 2001-09-22 | 2001-11-09 | 이희만 | How to use recycled ceramics for metal surface treatment |
-
1984
- 1984-05-11 JP JP9420784A patent/JPS60238488A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60238488A (en) | 1985-11-27 |
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