JPS63255353A - Compounded powder for thermal spraying and production thereof - Google Patents
Compounded powder for thermal spraying and production thereofInfo
- Publication number
- JPS63255353A JPS63255353A JP8832087A JP8832087A JPS63255353A JP S63255353 A JPS63255353 A JP S63255353A JP 8832087 A JP8832087 A JP 8832087A JP 8832087 A JP8832087 A JP 8832087A JP S63255353 A JPS63255353 A JP S63255353A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- particle size
- alloy
- thermal spraying
- weight
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 69
- 238000007751 thermal spraying Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000002245 particle Substances 0.000 claims abstract description 56
- 239000000956 alloy Substances 0.000 claims abstract description 39
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 38
- 239000002131 composite material Substances 0.000 claims abstract description 38
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 22
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229910018487 Ni—Cr Inorganic materials 0.000 claims abstract description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 3
- 229910002060 Fe-Cr-Al alloy Inorganic materials 0.000 abstract description 4
- 238000005204 segregation Methods 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 description 25
- 239000011248 coating agent Substances 0.000 description 24
- 238000005469 granulation Methods 0.000 description 10
- 230000003179 granulation Effects 0.000 description 10
- 239000011812 mixed powder Substances 0.000 description 9
- 239000007921 spray Substances 0.000 description 8
- 229910000599 Cr alloy Inorganic materials 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 238000005507 spraying Methods 0.000 description 6
- 239000002002 slurry Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 2
- 229910019589 Cr—Fe Inorganic materials 0.000 description 1
- 229910017112 Fe—C Inorganic materials 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Coating By Spraying Or Casting (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、溶射して得られる発熱抵抗体の抵抗値が、安
定したものとなる溶射用複合粉末とその製造方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a composite powder for thermal spraying that provides a stable resistance value of a heating resistor obtained by thermal spraying, and a method for producing the same.
「従来の技術」
金属酸化物および合金との混合物を溶射して溶射被膜を
形成し、その溶射被膜を各種の抵抗発熱体として使用す
る提案がされている。"Prior Art" It has been proposed to thermally spray a mixture of a metal oxide and an alloy to form a thermally sprayed coating, and to use the thermally sprayed coating as various resistance heating elements.
溶射被膜を抵抗発熱材として用いる場合、溶射用粉末は
流動性を考慮して粒径がｌＯ〜８０ｇｍ程度のものを使
用している。この種の溶射用粉末には、第４図に示すよ
うな混合粉末と、第５図に示すような複合粉末とがある
。混合粉末は、不定形状に粉砕した形状のアルミナ粉砕
粉（第４図ａ）中に、はぼ球状に造粒したＸｌ−Ｃｒ合
金（第４図ｂ）が単に混合した状態となっている。また
複合粉末は、粒径が３０１Ｌｍ以上のＸｌ−Ｃｒ粒子と
粒径２〜３ｐｍのアルミナとを造粒したものであり、第
５図に示すように、旧−Ｃｒ合金粉末が５４ｍ程度の小
さいものから５０ｐｍ程度の大きい粒子のものまで不均
一に含有されているものであった。When the thermal spray coating is used as a resistance heating material, thermal spray powder having a particle size of about 10 to 80 gm is used in consideration of fluidity. This type of powder for thermal spraying includes a mixed powder as shown in FIG. 4 and a composite powder as shown in FIG. 5. The mixed powder is simply a mixture of spherically granulated Xl-Cr alloy (FIG. 4b) in alumina pulverized powder (FIG. 4a) that has been pulverized into an irregular shape. The composite powder is made by granulating Xl-Cr particles with a particle size of 301 Lm or more and alumina with a particle size of 2 to 3 pm, and as shown in Figure 5, the old-Cr alloy powder has a small particle size of about 54 Lm. The particles were unevenly contained, ranging from small particles to large particles of about 50 pm.
「発明が解決しようとする問題点」
従来の溶射用混合粉末又は複合粉末を用いて円筒状基体
外周や平板面に溶射被膜を形成した場合、被膜の厚さを
均一に形成することが困難であり、しかも各位ｎでの部
分抵抗値特性が不安定であるとともに、再現性が悪いと
いう問題があった。“Problems to be Solved by the Invention” When a thermal spray coating is formed on the outer periphery of a cylindrical substrate or on a flat plate surface using a conventional thermal spray mixed powder or composite powder, it is difficult to form a coating with a uniform thickness. Moreover, there were problems in that the partial resistance value characteristics at each position n were unstable and the reproducibility was poor.
これらの問題は、従来の溶射粉末を溶射すると粒径が小
さくて軽い金属酸化物が飛び散って付着しにくいからと
考えられる。また比重が３〜４ｇ／ＣＣのアルミナ粉砕
粉と比重が６〜８ｇ／ｃｃの旧−Ｃｒ合金粉を混合した
混合粉末、あるいは比較的大きな粒径、例えば３０ｇｍ
以上の旧−Ｃｒ粒子を用いて作成した複合粉末は、アル
ミナ粉と旧−Ｃｒ粉との比重が大きいために、溶射され
てできる被膜の成分に偏析が生じるためとも考えられる
。These problems are thought to be due to the fact that when conventional thermal spray powders are sprayed, light metal oxides with small particle sizes scatter and are difficult to adhere to. Also, mixed powder of alumina pulverized powder with a specific gravity of 3 to 4 g/cc and old-Cr alloy powder with a specific gravity of 6 to 8 g/cc, or a relatively large particle size, e.g. 30 g
In the composite powder prepared using the above-mentioned prior-Cr particles, the specific gravity of the alumina powder and the prior-Cr powder is high, so it is thought that segregation occurs in the components of the coating formed by thermal spraying.
そこで本発明は、軽い金属酸化物が溶射の際に飛び散る
のを抑制するとともに１合金粒径を小さく均一にして溶
射被膜内での偏析をなくすことにより、安定した抵抗値
の溶射被膜が得られるようにすることを目的とする。Therefore, the present invention suppresses the scattering of light metal oxides during thermal spraying, and makes it possible to obtain a thermal sprayed coating with a stable resistance value by reducing the grain size of one alloy and making it uniform to eliminate segregation within the thermal sprayed coating. The purpose is to do so.
ｒ問題点を解決するための手段」
本発明は、抵抗発熱体を得るための溶射用複合粉末に関
するものである。TECHNICAL FIELD The present invention relates to a composite powder for thermal spraying to obtain a resistance heating element.
第１の発明は、金属酸化物中に、旧、Ｏｒ、 Ａｌ、Ｆ
ｅから選ばれる２種以上の合金粒子を分散させた粒径２
０〜８０ルｍの溶射用複合粉末であり、合金粒子の粒径
は５〜２０ｇｍであり、金属酸化物が６０〜９０重量％
で合金が１０〜４０重量％であることを特徴とする。The first invention includes old, Or, Al, F in the metal oxide.
Particle size 2 in which two or more types of alloy particles selected from e are dispersed
It is a composite powder for thermal spraying of 0-80 lm, the particle size of alloy particles is 5-20 gm, and the metal oxide content is 60-90 wt%.
The alloy is characterized by being 10 to 40% by weight.
金属酸化物としては、 Ａｌ、Ｔｉ、 Ｓｉから選ばれ
る酸化物を適用でき、それら酸化物は溶射膜内に連続し
た合金層をより好ましく分散する性質をもっために望ま
しい。As the metal oxide, oxides selected from Al, Ti, and Si can be used, and these oxides are preferable because they have the property of dispersing a continuous alloy layer in the sprayed film more preferably.
合金としては旧−Ｃｒ、 Ｆｅ−Ｃｒ−Ａｌ等があり、
合金粒子の粒径は５〜２０ルｍとする。これは５７ｚｍ
以下では溶射被膜中に合金の流動層（第６図ａ）ができ
ず、所定の抵抗値が得られなくなるからであり、２０μ
ｍ以上では被膜表面が粗く発熱体としての使用に不適だ
からである。The alloys include old-Cr, Fe-Cr-Al, etc.
The grain size of the alloy particles is between 5 and 20 lm. This is 57zm
This is because a fluidized layer of alloy (Fig. 6a) will not be formed in the thermally sprayed coating, making it impossible to obtain the specified resistance value.
This is because if it is more than m, the surface of the coating will be rough and unsuitable for use as a heating element.
溶射被膜の抵抗値を所定のものにするためには、合金と
して旧−Ｃｒを使用する場合、それは７０〜８０重量％
のＮｉと１０〜３０重量％のＣｒからなるものが望まし
く、合金としてＦｅ−Ｃｒ−Ａｌを使用する場合、それ
は６５〜９０重量％のＦｅと１０〜３０重量％のＣｒと
２〜５重量％のＡｌとからなるものが望ましい。In order to achieve the desired resistance value of the sprayed coating, when old-Cr is used as the alloy, it must be 70 to 80% by weight.
If Fe-Cr-Al is used as the alloy, it is preferably composed of 65-90% Fe, 10-30% Cr and 2-5% by weight. It is preferable to use Al.
溶射用複合粉末の粒径を２０〜８０１Ｌｍとしたのは、
合金粒子を均一に分散させて、溶射被膜の抵抗値を安定
させるためである。また溶射用複合粉末を球状に形成し
て、溶射時に流動層型粉体供給機による供給量を安定に
し、被膜の膜厚を一様にする。The particle size of the composite powder for thermal spraying was set to 20 to 801 Lm because
This is to uniformly disperse the alloy particles and stabilize the resistance value of the sprayed coating. Furthermore, the composite powder for thermal spraying is formed into a spherical shape to stabilize the amount supplied by the fluidized bed powder feeder during thermal spraying and to make the thickness of the coating uniform.
金属酸化物を６０〜９０重量％、合金を１０〜４０重量
％としたのは、溶射被膜の比抵抗を発熱体として使用す
るのに適切な１０−３〜ｌＯΩ１１ｃ■とするためであ
る。すなわち、合金が１０重量％以下では被膜の抵抗が
ｌＯΩ拳ｃ層より大きくなってしまい、合金が４０重蓼
％以上では１Ｏ−３Ω・ｃｍ以下になってしまうからで
ある。The reason why the metal oxide content is 60 to 90% by weight and the alloy content is 10 to 40% by weight is to set the resistivity of the sprayed coating to 10 -3 to 10Ω11c, which is appropriate for use as a heating element. That is, if the alloy is less than 10% by weight, the resistance of the coating will be greater than the 1OΩ layer, and if the alloy is more than 40% by weight, the resistance will be less than 1O-3Ω·cm.
合金として旧−Ｃｒを使用する場合、旧が７０〜９０重
量％で、Ｃｒが１０〜３０重量％のものを使用するのが
望ましく、１力ｉ７０重量％以下になると抵抗体の温度
係数が高くなり、またＸｉが９０重量％より大きいと温
度係数が高くなり、さらに比抵抗値が小さくなるからで
ある。When using old-Cr as an alloy, it is preferable to use one containing 70 to 90% by weight of old and 10 to 30% by weight of Cr. If the total i is less than 70% by weight, the temperature coefficient of the resistor will be high. Moreover, if Xi is larger than 90% by weight, the temperature coefficient becomes high and the specific resistance value further becomes small.
第２の発明は、溶射用複合粉末を製造する方法であり、
粒径 １”４４ｍの金属酸化物粉末６０〜９０重量％と
、粒径５〜２０Ｂｍの合金粉末１０〜４０重量％との混
合粉にバインダを加えてスラリー状にし、このスラリー
状混合物を２０〜８０μの粒子に造粒して溶射用複合粉
末とする。使用する金属酸化物の粒径を １〜４ ｇｍ
としたのは、合金粒子を均一に分散できるようにするた
めである。また合金粒径を５〜２０ｇｍにしたのは、溶
射用複合粉末に造粒したときに合金を適当な粒子径に調
整し易くするためである。The second invention is a method of manufacturing composite powder for thermal spraying,
A binder is added to a mixed powder of 60 to 90% by weight of metal oxide powder with a particle size of 1"44m and 10 to 40% by weight of an alloy powder with a particle size of 5 to 20Bm to form a slurry. This slurry mixture is The composite powder for thermal spraying is made by granulating into particles of 80 μm.The particle size of the metal oxide used is 1 to 4 gm.
The reason for this is that the alloy particles can be uniformly dispersed. The reason why the alloy particle size is set to 5 to 20 gm is to make it easier to adjust the alloy to an appropriate particle size when granulated into a composite powder for thermal spraying.
また金属酸化物粉末６０〜９０重量％、合金粉末１０〜
４０重量％としたのは、所定の抵抗値を得るためである
。Also, metal oxide powder 60-90% by weight, alloy powder 10-90% by weight
The reason for setting it to 40% by weight is to obtain a predetermined resistance value.
尚、本発明において、上記粒径範囲はほとんど大部分の
粉末がこの範囲内にあることを示すものであって、この
範囲外の粒径を有する若干の粉末が含まれていても良い
。In the present invention, the above particle size range indicates that most of the powder is within this range, and some powder having a particle size outside this range may be included.
「実施例１」
金属酸化物としてアルミナ、合金として旧−Ｃｒを使用
した溶射用複合粉末の実施例を説明する。"Example 1" An example of a composite powder for thermal spraying using alumina as a metal oxide and old-Cr as an alloy will be described.
なおＮｉ−Ｃｒ合金は、８０重量％のＮｉと２０重量％
のＣｒからなるものを使用した。Note that the Ni-Cr alloy contains 80% by weight Ni and 20% by weight
A material made of Cr was used.
粒径５〜２０μｍのＮｉ−Ｃｒ合金粉末を３０重量％と
粒径 １〜４ルｍのアルミナ粉末７０重量％とにバイン
ダ（ポリビニルアルコール）を１重量％加えてボールミ
ルで混合し、スラリー状とした。このスラリー状の混合
物を粒径２０〜８０μｍの粒子状に造粒して、溶射用複
合粉末を製造した。30% by weight of Ni-Cr alloy powder with a particle size of 5 to 20 μm, 70% by weight of alumina powder with a particle size of 1 to 4 μm, and 1% by weight of a binder (polyvinyl alcohol) were mixed in a ball mill to form a slurry. did. This slurry-like mixture was granulated into particles having a particle size of 20 to 80 μm to produce a composite powder for thermal spraying.
なお、溶射用複合粉末の造粒は第１図に示す装置により
行なった。その装着は造粒槽ｌの噴出口２から出る前記
スラリー状混合物を噴霧装置３により噴霧状に噴出させ
、造粒槽ｌを旋回流の状態にしておくと、噴霧されたス
ラリーは旋回しつつ造粒槽ｌ内を落下する。造粒槽ｌは
、ブロアーとじ一夕とからなる熱風供給装置４に連通さ
れ、その熱風は造粒槽１の上部から下方に向って流れ。The composite powder for thermal spraying was granulated using the apparatus shown in FIG. To install it, the slurry-like mixture coming out of the spout 2 of the granulation tank 1 is jetted out in the form of a spray by the spray device 3, and when the granulation tank 1 is kept in a swirling flow state, the sprayed slurry is swirled. It falls inside the granulation tank l. The granulation tank 1 is connected to a hot air supply device 4 consisting of a blower and a blower, and the hot air flows downward from the top of the granulation tank 1.
排気装置５を介して排気されるようになっている、その
ため造粒槽ｌ内を旋回しつつ落下する噴霧状スラリーが
乾燥されて球状に造粒され、造粒槽１の下部から取出す
ことができる。なお造粒方法は、この装置を使用するも
のに限るものではなく、他の公知の造粒方法によっても
よい。It is designed to be exhausted through the exhaust device 5, so that the atomized slurry falling while rotating inside the granulation tank 1 is dried and granulated into spherical shapes, and can be taken out from the lower part of the granulation tank 1. can. Note that the granulation method is not limited to the one using this apparatus, and other known granulation methods may be used.
上記によって得られた溶射用複合粉末の断面の顕微鏡写
真を、第２図（倍率１０００倍）と第３図（倍率１２０
倍）に示した。第２．３図から溶射用複合粉末は、アル
ミナ中に粒子径５〜２０μｍのＮｉ −Ｃｒ合金粒子が
均一に分散していることがわかる。Micrographs of the cross section of the thermal spray composite powder obtained above are shown in Figure 2 (1000x magnification) and Figure 3 (120x magnification).
times). It can be seen from Figure 2.3 that in the composite powder for thermal spraying, Ni-Cr alloy particles having a particle size of 5 to 20 μm are uniformly dispersed in alumina.
なお比較のために、従来の混合粉末、すなわち、不定形
状に破砕した形状のアルミナ粉砕粉中にほぼ球状に造粒
したＸｌ−Ｃｒ合金粒子が含まれているものの顕微鏡写
真（倍率２４０倍）を第４図に示した。また従来の複合
粉、すなわち粒径３ＪＬｍ以下のアルミナ粉末を使用し
、粒径３０ｇｍ以上の旧−Ｃｒ粉末を使用した溶射用複
合粉末の断面のＪＩｌ！１１１鏡写真（倍率１０００倍
）を第５図に示した。For comparison, here is a micrograph (magnification: 240x) of a conventional mixed powder, that is, alumina pulverized powder crushed into an irregular shape, containing Xl-Cr alloy particles granulated into approximately spherical shapes. It is shown in Figure 4. In addition, JIl of a cross section of a conventional composite powder, that is, a thermal spraying composite powder using alumina powder with a particle size of 3 JLm or less and old-Cr powder with a particle size of 30 gm or more! 111 mirror photograph (1000x magnification) is shown in Figure 5.
以上から本実施例の溶射用複合粉末（第３図）は、従来
の混合粉や複合粉よりＸｌ−Ｃｒ合金粒子が球に近く、
アルミナ中に均一に分散していることがわかる。From the above, the composite powder for thermal spraying of this example (Fig. 3) has Xl-Cr alloy particles that are more spherical than conventional mixed powders and composite powders.
It can be seen that it is uniformly dispersed in alumina.
前記により得られた溶射用複合粉末を使用して、外径３
０■濡、長さ３２０１■の鉄パイプの外周に溶射、した
、溶射条件は、電圧７０ｖ、電流５００Ａ、プラズマガ
スＡｒを３８Ｒ／ｗｉｎ 、 Ｈ２を７Ｊ／ｗｉｎとし
た。Using the composite powder for thermal spraying obtained above, the outer diameter is 3.
Thermal spraying was carried out on the outer periphery of an iron pipe with a wetness of 0.0 cm and a length of 3201 cm. The spraying conditions were a voltage of 70 V, a current of 500 A, plasma gas Ar at 38 R/win, and H2 at 7 J/win.
溶射被膜の顕微鏡写真を第６図に示した。第６図で、白
く見える流動層（図中ａ）がＮｆ−Ｃｒ合金であり、黒
く見えるのがアルミナである。この旧−Ｃｒ合金の流動
層が次々に連続されて、適切で安定した抵抗となるもの
と考えられる。なお従来の混合粉および複合粉を使用し
て同様に溶射被膜を形成したが、第７図の顕微鏡写真に
示すように本実施例のようなＮｉ −Ｃｒの流動層は生
じなかった。A microscopic photograph of the sprayed coating is shown in FIG. In FIG. 6, the fluidized bed that appears white (a in the figure) is the Nf-Cr alloy, and the fluidized bed that appears black is alumina. It is believed that this fluidized bed of the old-Cr alloy is successively connected to provide appropriate and stable resistance. Incidentally, a thermally sprayed coating was similarly formed using conventional mixed powder and composite powder, but as shown in the micrograph of FIG. 7, a fluidized bed of Ni--Cr was not formed as in this example.
さらに得られた溶射被膜の長手方向の各位置での被膜厚
さを第８図に示し、モして溶射被膜の長手方向の各位置
での部分抵抗値を第９図に示した、また第８．９図には
比較のために、従来の混合粉と複合粉を使用して溶射し
た被膜の厚さと抵抗値をそれぞれ示した。Furthermore, the coating thickness at each position in the longitudinal direction of the obtained thermal sprayed coating is shown in FIG. 8, and the partial resistance value at each longitudinal position of the thermal sprayed coating is shown in FIG. 9. For comparison, Figure 8.9 shows the thickness and resistance of coatings sprayed using conventional mixed powder and composite powder, respectively.
第８．９図かられかるように、本実施例の溶射被膜は従
来例に比較して、厚さが均一であり、かつ抵抗値も安定
している。As can be seen from FIG. 8.9, the sprayed coating of this example has a more uniform thickness and a more stable resistance value than the conventional example.
「実施例２」
次に前記実施例１で使用したアルミナとＸｌ−Ｃｒの粒
子径を変更して各種の溶射用複合粉末を造粒し、それら
で第１実施例と同様に溶射被膜を形成した。そしてそれ
ぞれの被膜の膜厚の均一性と部分抵抗値の安定性を測定
し、表１に示した。"Example 2" Next, various composite powders for thermal spraying were granulated by changing the particle sizes of the alumina and Xl-Cr used in Example 1, and a thermal spray coating was formed using them in the same manner as in Example 1. did. The uniformity of the film thickness and the stability of the partial resistance value of each film were measured and shown in Table 1.
表１から、アルミナ粒径は１〜４終ｍのものが望ましく
、旧−Ｃｒの粒径は５〜２０μｍのものが望ましいこと
がわかる。From Table 1, it can be seen that the alumina particle size is preferably 1 to 4 μm, and the prior-Cr particle size is 5 to 20 μm.
「実施例３」
次に金属酸化物と合金の種類を変更して第１実施例と同
様の溶射膜を形成し、それぞれの被膜の膜厚の均一性と
部分抵抗値の安定性を測定し、表２に示した。なお金属
酸化物の粒径は １〜４終■とじ、合金の粒径は５〜２
０１Ｌｍとした。"Example 3" Next, a sprayed film similar to that of the first example was formed by changing the type of metal oxide and alloy, and the uniformity of the film thickness and stability of the partial resistance value of each film were measured. , shown in Table 2. The particle size of the metal oxide is 1 to 4, and the particle size of the alloy is 5 to 2.
01Lm.
表２から金属酸化物として、Ａｌ、 Ｔｉ、 Ｓｉの醸
化物が適切であり、合金としてＮｉ−Ｃｒ、 Ｆｅ−Ｃ
ｒ−Ａｌ、旧−Ｃｒ−Ｆｅが適切であることがわかる。From Table 2, as metal oxides, brewers of Al, Ti, and Si are suitable, and as alloys, Ni-Cr, Fe-C
It can be seen that r-Al and old-Cr-Fe are suitable.
なおＦｅ−Ｃｒ−Ａｌ合金は、８５〜９０重量％のＦｅ
と１０〜３０重量％のＣｒと ２〜５重量％のＡＩとか
らなるものが望ましい、それは、抵抗体の比抵抗値が大
きく、温度係数が小さいためである。Note that the Fe-Cr-Al alloy contains 85 to 90% by weight of Fe.
A material consisting of 10 to 30% by weight of Cr and 2 to 5% by weight of AI is desirable because the resistor has a large specific resistance value and a small temperature coefficient.
「発明の効果」
本発明の溶射用複合粉末あるいはその製造方法により得
られる溶射用複合粉末を使用すれば、溶射被膜の膜厚に
均一性があり、かつ被膜中に合金の流動層ができる。よ
って被膜の抵抗値が１０−３〜ｌＯΩ・ｃｍの範囲内で
安定したものとなり、各種の発熱体として使用し易いも
のとなる。"Effects of the Invention" When the composite powder for thermal spraying of the present invention or the composite powder for thermal spraying obtained by the method for producing the same is used, the thickness of the thermal spray coating is uniform and a fluidized layer of alloy is formed in the coating. Therefore, the resistance value of the coating becomes stable within the range of 10<-3> to 1O[Omega].cm, making it easy to use as various heating elements.
第１図は本発明の製造方法に使用する造粒装置の概略図
、第２図および第３図は本発明の溶射用複合粉末の顕微
鏡による金属組織写真、第４図は従来の溶射用混合粉の
顕微鏡による金属組織写真、第５図は従来の溶射用複合
粉末の顕微鏡による金属組織写真、第６図は本発明の溶
射用複合粉末を使用した溶射被膜の断面を示す顕微鏡に
よる金属組織写真、第７図は従来の粉末を使用した溶射
被膜の断面を示す顕微鏡による金属組織写真、第８図は
溶射被膜の厚さ分布を示すグラフ、第９図は溶射被膜の
部分抵抗値を示すグラフである。
出願人 日立金属 株式会社
代理人 弁理士 牧 克 次
第１図
メ＃＃Ｊｔ４＃Ｊ
第８図
第９図
被護の長手方向位置（ｍｍ）Figure 1 is a schematic diagram of a granulation device used in the manufacturing method of the present invention, Figures 2 and 3 are microscopic metallographic photographs of the composite powder for thermal spraying of the present invention, and Figure 4 is a conventional mixture for thermal spraying. A microscopic metallographic photograph of the powder, Fig. 5 is a microscopic metallographic photograph of a conventional thermal spray composite powder, and Fig. 6 is a microscopic metallographic photograph showing a cross section of a thermal spray coating using the thermal spraying composite powder of the present invention. , Fig. 7 is a microscopic metallographic photograph showing the cross section of a sprayed coating using conventional powder, Fig. 8 is a graph showing the thickness distribution of the sprayed coating, and Fig. 9 is a graph showing the partial resistance value of the sprayed coating. It is. Applicant Hitachi Metals Co., Ltd. Agent Patent Attorney Katsu Maki Figure 1 Me # # Jt 4 # J Figure 8 Figure 9 Longitudinal position of protection (mm)
Claims (6)
Ａｌ、Ｆｅから選ばれる２種以上の合金粒子が分散した
粒径２０〜８０μｍの複合粉末からなり、金属酸化物が
６０〜９０重量％で、合金が１０〜４０重量％であるこ
とを特徴とする溶射用複合粉末。(1) Ni, Cr with a particle size of 5 to 20 μm in metal oxide,
It consists of a composite powder with a particle size of 20 to 80 μm in which two or more types of alloy particles selected from Al and Fe are dispersed, and the metal oxide is 60 to 90% by weight and the alloy is 10 to 40% by weight. Composite powder for thermal spraying.
量％のＣｒからなることを特徴とする特許請求の範囲第
１項に記載の溶射用複合粉末。(2) The composite powder for thermal spraying according to claim 1, wherein the alloy consists of 70 to 90% by weight of Ni and 10 to 30% by weight of Cr.
量％のＣｒと２〜５重量％のＡｌとからなることを特徴
とする特許請求の範囲第１項に記載の溶射用複合粉末。(3) The composite for thermal spraying according to claim 1, wherein the alloy consists of 65 to 90% by weight of Fe, 10 to 30% by weight of Cr, and 2 to 5% by weight of Al. powder.
化物であることを特徴とする特許請求の範囲第１項に記
載の溶射用複合粉末。(4) The composite powder for thermal spraying according to claim 1, wherein the metal oxide is an oxide selected from Al, Ti, and Si.
％と、粒径１０〜２０μｍの合金粉末１０〜４０重量％
とにバインダを加えて混合し、その混合物を２０〜８０
μｍの粒子に造粒することを特徴とする溶射用複合粉末
の製造方法。(5) 60-90% by weight of metal oxide powder with a particle size of 1-4 μm and 10-40% by weight of alloy powder with a particle size of 10-20 μm
Add the binder to and mix, and the mixture
A method for producing a composite powder for thermal spraying, the method comprising granulating it into μm particles.
ることを特徴とする特許請求の範囲第５項に記載の溶射
用複合粉末の製造方法。(6) The method for producing a composite powder for thermal spraying according to claim 5, wherein the metal oxide is alumina and the alloy is Ni-Cr.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8832087A JPS63255353A (en) | 1987-04-10 | 1987-04-10 | Compounded powder for thermal spraying and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8832087A JPS63255353A (en) | 1987-04-10 | 1987-04-10 | Compounded powder for thermal spraying and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63255353A true JPS63255353A (en) | 1988-10-21 |
Family
ID=13939625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8832087A Pending JPS63255353A (en) | 1987-04-10 | 1987-04-10 | Compounded powder for thermal spraying and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63255353A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5061560A (en) * | 1989-06-16 | 1991-10-29 | Shin-Etsu Chemical Co., Ltd. | Spherical grains of rare earth oxides and a manufacturing method therefor |
-
1987
- 1987-04-10 JP JP8832087A patent/JPS63255353A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5061560A (en) * | 1989-06-16 | 1991-10-29 | Shin-Etsu Chemical Co., Ltd. | Spherical grains of rare earth oxides and a manufacturing method therefor |
| US5152936A (en) * | 1989-06-16 | 1992-10-06 | Shin-Etsu Chemical Co., Ltd. | Method of manufacturing spherical grains of rare earth oxides |
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