JPH093621A - Method for chromium diffusion coating for metallic material - Google Patents
Method for chromium diffusion coating for metallic materialInfo
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- JPH093621A JPH093621A JP15651295A JP15651295A JPH093621A JP H093621 A JPH093621 A JP H093621A JP 15651295 A JP15651295 A JP 15651295A JP 15651295 A JP15651295 A JP 15651295A JP H093621 A JPH093621 A JP H093621A
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- pure
- diffusion coating
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- powdery
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- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属材のクロム拡散コ
ーティング方法に係り、特に、作業性の向上と使用原料
種類の削減とを図るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chromium diffusion coating method for a metal material, and particularly to improve workability and reduce the kinds of raw materials used.
【０００２】[0002]
【従来の技術】高温環境下等における金属材の耐酸化
性，耐食性を向上させる技術として、クロム拡散コーテ
ィングを施すことが有効である。2. Description of the Related Art It is effective to apply a chromium diffusion coating as a technique for improving the oxidation resistance and corrosion resistance of a metal material under a high temperature environment.
【０００３】図４は、ニッケル基合金等の金属材に対す
るクロム拡散コーティング技術の従来例を示している。
該従来技術例にあっては、純Ｃｒ，ＮＨ4 Ｃｌ，Ａｌ2
Ｏ3 をそれぞれ粉末化したものを均一に混合し、混合粉
末１を反応容器２に入れるとともに、反応容器２に被処
理金属材３を装填し、反応容器２の内部を不活性ガス雰
囲気として加熱することにより、Ｃｒ含有ガス（塩化ク
ロムガス等）を生成して、被処理金属材３の表面にクロ
ム拡散コーティングするものである。FIG. 4 shows a conventional example of a chromium diffusion coating technique for a metal material such as a nickel-based alloy.
In the prior art example, pure Cr, NH 4 Cl, Al 2
The powdered O 3 is uniformly mixed, the mixed powder 1 is put into the reaction vessel 2, the metal material 3 to be treated is loaded into the reaction vessel 2, and the inside of the reaction vessel 2 is heated with an inert gas atmosphere. By doing so, a Cr-containing gas (chromium chloride gas or the like) is generated and chromium diffusion coating is performed on the surface of the metal material 3 to be treated.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上述のコーテ
ィング方法であると、混合粉末１を使用しているため
に、複数種類の粉末の混合作業や混合粉末１の反応容器
２への充填作業の実施時に、粉末が飛散し易く、作業環
境が非常に悪くなるとともに、余剰の混合粉末１が保管
中の相互反応による組成変化を起こして、品質が低下す
る等の難点がある。However, in the above-mentioned coating method, since the mixed powder 1 is used, the mixing work of plural kinds of powders and the filling work of the mixed powder 1 into the reaction vessel 2 are performed. At the time of implementation, the powder easily scatters, the working environment becomes very bad, and the surplus mixed powder 1 causes a composition change due to a mutual reaction during storage, which causes a problem such as deterioration in quality.
【０００５】本発明は、これらの課題に鑑みてなされた
もので、以下の目的を達成しようとしている。 コーティング材料の取り扱い性を向上させること。 作業環境を改良すること。 コーティング材料の損失発生や品質低下を抑制するこ
と。[0005] The present invention has been made in view of these problems, and aims to achieve the following objects. To improve the handling of coating materials. Improving the working environment. To prevent loss of coating material and deterioration of quality.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
の手段として、純Ｃｒ粒の表面に粉末状態のＮＨ4 Ｃｌ
を接触状態とする工程と、純Ｃｒ粒及びＮＨ4 Ｃｌを不
活性ガス雰囲気で加熱してＣｒ含有ガスを生成する工程
と、Ｃｒ含有ガスを被処理金属材の表面に接触させてク
ロム拡散コーティング層を形成する工程とを有する技術
が適用される。この場合の純Ｃｒ粒の大きさは、粉末状
態のＮＨ4 Ｃｌの径に対して相対的に大きく、かつ１０
倍以上のものが適用される。純Ｃｒ粒は、ＮＨ4 Ｃｌ量
に対して１０倍程度またはそれ以上に設定される。粉末
状態のＮＨ4 Ｃｌは、並べた純Ｃｒ粒の上に振りかける
等により、まぶした状態とするとともに、その際に純Ｃ
ｒ粒の大きさに基づく凹凸部を残すように設定される。
クロム拡散コーティング時の処理条件は、１０５２℃程
度で数時間ないし１０数時間加熱とすることが望まし
い。[Means for Solving the Problems] As means for solving the above problems, NH 4 Cl in a powder state is formed on the surface of pure Cr grains.
And a step of heating pure Cr grains and NH 4 Cl in an inert gas atmosphere to generate a Cr-containing gas, and bringing the Cr-containing gas into contact with the surface of the metal material to be treated to perform chromium diffusion coating. A step of forming a layer is applied. The size of the pure Cr grains in this case is relatively large with respect to the diameter of NH 4 Cl in the powder state, and is 10
More than double is applied. The pure Cr grains are set to about 10 times or more the amount of NH 4 Cl. The powdered NH 4 Cl is sprinkled on the arranged pure Cr grains so as to be sprinkled, and at that time, pure C
It is set so as to leave an uneven portion based on the size of the r grain.
The treatment conditions for chromium diffusion coating are preferably heating at about 1052 ° C. for several hours to several tens of hours.
【０００７】[0007]
【作用】純Ｃｒ粒にＮＨ4 Ｃｌを接触させた状態で加熱
すると、純Ｃｒ粒の表面の回りでＣｒ含有ガスが集中的
に発生し、濃度の高いＣｒ含有ガスが被処理金属材の表
面に送り込まれて、クロム拡散現象が加速される。純Ｃ
ｒ粒について、径を大きくかつ量を多くすることによ
り、純Ｃｒ粒とＮＨ4 Ｃｌ粉末との接触性が高められる
とともに、純Ｃｒ粒の大きさに基づく凹凸部の形成とあ
いまって、純Ｃｒ粒の回りに介在するＮＨ4 Ｃｌ粉末の
層が薄くなり、Ｃｒ含有ガスの透過性向上に基づき、Ｃ
ｒ含有ガスが速やかに被処理金属材の表面に送り込まれ
る。粉末状態の材料をＮＨ4 Ｃｌのみとすることによ
り、材料取り扱い時の飛散現象の発生が抑制されるとと
もに、拡散コーティング作業後の材料の分離性が改良さ
れ、材料の個別保管管理により品質低下が抑制される。When the pure Cr particles are heated in contact with NH 4 Cl, the Cr-containing gas is concentrated around the surface of the pure Cr particles, and the high-concentration Cr-containing gas forms the surface of the metal material to be treated. And the chromium diffusion phenomenon is accelerated. Pure C
By increasing the diameter and increasing the amount of the r grains, the contact property between the pure Cr grains and the NH 4 Cl powder is enhanced, and in combination with the formation of the uneven portion based on the size of the pure Cr grains, the pure Cr grains are formed. The layer of NH 4 Cl powder present around the grains becomes thin, and due to the improved permeability of the Cr-containing gas, C
The r-containing gas is promptly sent to the surface of the metal material to be treated. By using only NH 4 Cl as a powdered material, the occurrence of scattering phenomenon when handling the material is suppressed, the separability of the material after the diffusion coating operation is improved, and the quality is deteriorated by the individual storage management of the material. Suppressed.
【０００８】[0008]
【実施例】以下、本発明に係る金属材のクロム拡散コー
ティング方法の一実施例について、図１ないし図３に基
づき説明する。図１にあっては、金属材のクロム拡散コ
ーティング方法の実施工程例のフローチャートを示し、
図２にあっては、クロム拡散コーティング方法の実施状
況を示しており、図３にあっては、クロム拡散コーティ
ングを模式化して示している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the chromium diffusion coating method for a metal material according to the present invention will be described below with reference to FIGS. FIG. 1 shows a flow chart of an example of steps for carrying out a chromium diffusion coating method for a metal material,
FIG. 2 shows a state of implementation of the chromium diffusion coating method, and FIG. 3 schematically shows the chromium diffusion coating.
【０００９】該一実施例にあっては、従来技術例で説明
した三つの材料（純Ｃｒ，ＮＨ4 Ｃｌ，Ａｌ2 Ｏ3 ）か
らなる混合粉末を利用する方法に代えて、Ａｌ2 Ｏ3 の
利用が省略され、かつ、純Ｃｒにあっては、粒の大きさ
が、粉末状態のＮＨ4 Ｃｌの径に対して相対的に相当大
きくしたものが適用され、例えば１０倍以上のものが適
用される。[0009] In the said embodiment, the three materials described in the prior art example (pure Cr, NH 4 Cl, Al 2 O 3) instead of the method using a mixed powder consisting of, Al 2 O 3 Is omitted, and in the case of pure Cr, the grain size of which is considerably larger than the diameter of NH 4 Cl in the powder state is applied, for example, 10 times or more. Applied.
【００１０】その詳細について説明すると、純Ｃｒ粒１
１にあっては、粒径が例えば数ｍｍないし数１０ｍｍ程
度のものが適用され、ＮＨ4 Ｃｌ１２にあっては、粒径
が例えば１ｍｍ以下程度のものが適用される。また、純
Ｃｒ粒１１の使用重量は、ＮＨ4 Ｃｌ１２に対して１０
倍程度またはそれ以上となるように設定される。The details will be described. Pure Cr grains 1
In No. 1, a particle size of about several mm to several tens of mm is applied, and for NH 4 Cl 12, a particle size of about 1 mm or less is applied. The weight of the pure Cr grains 11 used is 10 with respect to NH 4 Cl 12.
It is set to be about double or more.
【００１１】これらの純Ｃｒ粒１１及びＮＨ4 Ｃｌ１２
を使用して、被処理金属材３にクロム拡散コーティング
を行なう場合、図１のＳ１ないしＳ７及び図２に示す各
工程によって実施される。These pure Cr grains 11 and NH 4 Cl 12
When the chromium diffusion coating is performed on the metal material 3 to be processed by using, the steps are performed by the steps shown in S1 to S7 of FIG. 1 and FIG.
【００１２】〔Ｓ１：クロム塊の装填〕外径の大きな純
Ｃｒ粒１１を、例えば中空リング状の反応容器２の中に
並べた状態に装填する。なお、反応容器２にあっては、
加熱炉等の内部に配される。[S1: Chromium lump loading] Pure Cr grains 11 having a large outer diameter are loaded in a line in, for example, a hollow ring-shaped reaction vessel 2. In addition, in the reaction container 2,
It is placed inside a heating furnace.
【００１３】〔Ｓ２：粉末ＮＨ4 Ｃｌの充填〕粉末状態
のＮＨ4 Ｃｌを純Ｃｒ粒１１に振りかけてまぶした状態
とする。ＮＨ4 Ｃｌ１２を純Ｃｒ粒１１の上から掛ける
と、純Ｃｒ粒１１の粒形状に基づいて、図３に示すよう
に、ＮＨ4 Ｃｌ１２が純Ｃｒ粒１１の表面に付着した接
触状態となるとともに、ＮＨ4 Ｃｌ１２の層厚がばらつ
いて、凹凸部１３が形成される。[S2: Filling with powdered NH 4 Cl] Powdered NH 4 Cl is sprinkled on the pure Cr grains 11 and sprinkled. When NH 4 Cl 12 is applied from above the pure Cr grains 11, NH 4 Cl 12 comes into contact with the surface of the pure Cr grains 11 as shown in FIG. 3 based on the grain shape of the pure Cr grains 11. , NH 4 Cl 12, the layer thickness varies, and the concavo-convex portion 13 is formed.
【００１４】〔Ｓ３：被処理金属材の装填〕反応容器２
の内部には、例えばニッケル基合金からなる被処理金属
材３が、支持具１４により純Ｃｒ粒１１及びＮＨ4 Ｃｌ
１２に対して浮かせた状態に装填される。[S3: Loading of metal material to be treated] Reaction container 2
The metal material 3 to be treated made of, for example, a nickel-based alloy is provided inside the chamber by the support tool 14 so as to form pure Cr grains 11 and NH 4 Cl.
12 is loaded in a floating state.
【００１５】〔不活性ガス雰囲気化〕Ａｒガスを注入す
る等によって、反応容器２の内部を不活性ガス雰囲気に
置換する。[Inert Gas Atmosphere] The interior of the reaction vessel 2 is replaced with an inert gas atmosphere by injecting Ar gas or the like.
【００１６】〔Ｓ５：高温雰囲気化〕反応容器２の回り
等に配したヒータ１５を作動させて、反応容器２の内部
のコーティング材料を加熱する。この加熱により、純Ｃ
ｒ粒１１及びＮＨ4 Ｃｌ１２が、例えば１０５２℃程度
まで高められると、コーティング材料の気化が生じると
ともに、二つの原料の接触している箇所における物質間
の化学反応により、塩化クロムガス等のＣｒ含有ガスが
生成される。Ｃｒ含有ガスの生成量は、純Ｃｒ粒１１の
表面近傍において、表面からの気化が頻繁に行なわれる
ことと、ＮＨ4 Ｃｌ１２の層厚が薄くなることとに基づ
いて、凹凸部１３の突出部分で濃度が大きくなり、Ｃｒ
含有ガスが集中的に発生するものとなる。なお、加熱に
より反応容器２の内部で生じた不純ガスや余剰ガスは、
息抜き穴２ａを経由して排出される。[S5: High Temperature Atmosphere] The heater 15 disposed around the reaction vessel 2 is operated to heat the coating material inside the reaction vessel 2. By this heating, pure C
When the r-particles 11 and NH 4 Cl 12 are heated to, for example, about 1052 ° C., vaporization of the coating material occurs, and a chemical reaction between the two materials in contact with each other causes a Cr-containing gas such as chromium chloride gas. Is generated. The amount of the Cr-containing gas generated is based on the fact that the vaporization from the surface is frequently performed in the vicinity of the surfaces of the pure Cr grains 11 and the layer thickness of the NH 4 Cl 12 is thin. And the concentration increases, Cr
The contained gas is generated intensively. In addition, the impure gas and surplus gas generated inside the reaction vessel 2 by heating are
It is discharged via the breather hole 2a.
【００１７】〔Ｓ６：拡散コーティング層の形成〕Ｃｒ
含有ガスが、被処理金属材３の表面に接触すると、Ｃｒ
の拡散によって被処理金属材３の表面にクロム拡散コー
ティング層１６が形成される。前述の１０５２℃程度の
温度で、８時間処理を行なったところ、例えば５０μｍ
程度の厚さのクロム拡散コーティング層１６が得られ
た。[S6: Formation of Diffusion Coating Layer] Cr
When the contained gas contacts the surface of the metal material 3 to be treated, Cr
The chromium diffusion coating layer 16 is formed on the surface of the metal material 3 to be treated by the diffusion. When the treatment is performed for 8 hours at the temperature of about 1052 ° C., for example, 50 μm
A chromium diffusion coating layer 16 having a moderate thickness was obtained.
【００１８】クロム拡散コーティング処理された被処理
金属材３にあっては、自然冷却後等において反応容器２
から取り出されるが、純Ｃｒ粒１１にあっても反応容器
２から取り出され、保管管理される。In the case of the metal material 3 to be treated which has been subjected to the chromium diffusion coating, the reaction vessel 2 is left after natural cooling or the like.
However, even the pure Cr grains 11 are taken out from the reaction vessel 2 and stored and managed.
【００１９】〔他の実施態様〕本発明に係る金属材のク
ロム拡散コーティング方法にあっては、以下の技術を包
含するものである。 ａ）Ａｒガス等の不活性ガスを少量ずつ連続的に反応容
器２の内部に送り込み、かつ不要ガスの排出を行なうこ
と。 ｂ）反応容器２の形状を任意に設定すること。 ｃ）Ａｌ2 Ｏ3 粉末をＮＨ4 Ｃｌ粉末に混合して使用す
ること、また、Ａｌ2 Ｏ3 粉末の量を適宜調整するこ
と。[Other Embodiments] The chromium diffusion coating method for a metal material according to the present invention includes the following techniques. a) Inert gas such as Ar gas is continuously fed little by little into the reaction vessel 2 and unnecessary gas is discharged. b) To set the shape of the reaction vessel 2 arbitrarily. c) Use Al 2 O 3 powder mixed with NH 4 Cl powder, and adjust the amount of Al 2 O 3 powder appropriately.
【００２０】[0020]
【発明の効果】本発明に係る金属材のクロム拡散コーテ
ィング方法によれば、以下のような効果を奏する。 （１） 粒径の大きな純Ｃｒ粒を使用することと、従来
技術例に比較してＡｌ2Ｏ3 の使用を省略することとに
より、粉末原料の使用量を低減し、コーティング材料の
取り扱い性を向上させることができる。 （２） 上記に加えて、粉末原料の混合をなくすことに
より、作業環境を飛躍的に改善することができる。 （３） 粒径の大きな純Ｃｒ粒に粉末状態のＮＨ4 Ｃｌ
を振りかける等の接触状態とすることにより、凹凸部を
形成して濃度の高いＣｒ含有ガスの発生を容易にし、ク
ロム拡散コーティング作業を効率的に行なうことができ
る。 （４） 粒径の大きな純Ｃｒ粒と粉末状態のＮＨ4 Ｃｌ
との混在使用により、使用材料の種類を少なくするとと
もに、使用後の分離を粒径の差に基づく単純なものとし
て、コーティング材料の損失発生や管理時の品質低下を
抑制することができる。According to the chromium diffusion coating method for a metal material according to the present invention, the following effects can be obtained. (1) By using pure Cr grains having a large grain size and omitting the use of Al 2 O 3 as compared with the prior art example, the amount of powder raw material used is reduced and the coating material is easy to handle. Can be improved. (2) In addition to the above, by eliminating the mixing of powder raw materials, the working environment can be dramatically improved. (3) NH 4 Cl in a powder state in pure Cr particles having a large particle size
By making the contact state such as by sprinkling with, it is possible to form the uneven portion to facilitate generation of the Cr-containing gas having a high concentration, and to efficiently perform the chromium diffusion coating operation. (4) Pure Cr grains with large grain size and NH 4 Cl in powder state
By mixing and using, it is possible to reduce the number of types of materials used, and to make the separation after use simple based on the difference in particle size, thereby suppressing the loss of coating materials and the deterioration of quality during management.
【図１】本発明に係る金属材のクロム拡散コーティング
方法の実施工程例のフローチャートである。FIG. 1 is a flow chart of an example of steps for carrying out a chromium diffusion coating method for a metal material according to the present invention.
【図２】本発明に係る金属材のクロム拡散コーティング
方法の実施状況を示す正断面図である。FIG. 2 is a front sectional view showing an implementation state of a method for chromium coating a metal material according to the present invention.
【図３】図２によるクロム拡散コーティング作業の模式
図であるFIG. 3 is a schematic diagram of a chromium diffusion coating operation according to FIG.
【図４】ニッケル基合金等の金属材に対するクロム拡散
コーティング技術の従来例を示す模式図である。FIG. 4 is a schematic diagram showing a conventional example of a chromium diffusion coating technique for a metal material such as a nickel-based alloy.
１ 混合粉末 ２ 反応容器 ２ａ 息抜き穴 ３ 被処理金属材 １１ 純Ｃｒ粒 １２ ＮＨ4 Ｃｌ １３ 凹凸部 １４ 支持具 １５ ヒータ １６ クロム拡散コーティング層DESCRIPTION OF SYMBOLS 1 Mixed powder 2 Reaction container 2a Breathing hole 3 Metal material to be treated 11 Pure Cr particles 12 NH 4 Cl 13 Concavo-convex portion 14 Supporting tool 15 Heater 16 Chromium diffusion coating layer
Claims (4)
Ｈ4 Ｃｌ（１２）を接触状態とする工程と、純Ｃｒ粒及
びＮＨ4 Ｃｌを不活性ガス雰囲気で加熱してＣｒ含有ガ
スを生成する工程と、Ｃｒ含有ガスを被処理金属材
（３）の表面に接触させてクロム拡散コーティング層
（１６）を形成する工程とを有することを特徴とする金
属材のクロム拡散コーティング方法。1. A powder of N on the surface of pure Cr grains (11).
A step of bringing H 4 Cl (12) into contact, a step of heating pure Cr grains and NH 4 Cl in an inert gas atmosphere to generate a Cr-containing gas, and a Cr-containing gas to be treated metal material (3) And a step of forming a chromium diffusion coating layer (16) by contacting the surface of the metal with the chromium diffusion coating layer (16).
のＮＨ4 Ｃｌ（１２）の径に対して相対的に大きく、か
つ１０倍以上に設定されることを特徴とする請求項１記
載の金属材のクロム拡散コーティング方法。2. The size of the pure Cr grains (11) is set to be relatively larger than the diameter of the powdery NH 4 Cl (12) and set to 10 times or more. 1. The method for chromium diffusion coating of a metal material according to 1.
ｌ（１２）に対して、重量比で１０倍程度またはそれ以
上に設定されることを特徴とする請求項１または２記載
の金属材のクロム拡散コーティング方法。3. The amount of pure Cr grains (11) filled is NH 4 C.
The chromium diffusion coating method for a metal material according to claim 1 or 2, wherein the weight ratio is set to about 10 times or more with respect to l (12).
た純Ｃｒ粒（１１）の表面に、凹凸部（１３）を形成し
た状態に接触させられることを特徴とする請求項１、２
または３記載の金属材のクロム拡散コーティング方法。4. The NH 4 Cl (12) in a powder state is brought into contact with the surface of the arranged pure Cr grains (11) in a state where the concavo-convex portion (13) is formed. Two
Alternatively, the chromium diffusion coating method for a metal material as described in 3 above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15651295A JP3493815B2 (en) | 1995-06-22 | 1995-06-22 | Chrome diffusion coating method for metal materials |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15651295A JP3493815B2 (en) | 1995-06-22 | 1995-06-22 | Chrome diffusion coating method for metal materials |
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| Publication Number | Publication Date |
|---|---|
| JPH093621A true JPH093621A (en) | 1997-01-07 |
| JP3493815B2 JP3493815B2 (en) | 2004-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP15651295A Expired - Lifetime JP3493815B2 (en) | 1995-06-22 | 1995-06-22 | Chrome diffusion coating method for metal materials |
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| Country | Link |
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| JP (1) | JP3493815B2 (en) |
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