JP3017978B1 - Nickel brazing filler metal for EGR cooler joining, method of manufacturing EGR cooler using the same, and EGR cooler - Google Patents
Nickel brazing filler metal for EGR cooler joining, method of manufacturing EGR cooler using the same, and EGR coolerInfo
- Publication number
- JP3017978B1 JP3017978B1 JP28387898A JP28387898A JP3017978B1 JP 3017978 B1 JP3017978 B1 JP 3017978B1 JP 28387898 A JP28387898 A JP 28387898A JP 28387898 A JP28387898 A JP 28387898A JP 3017978 B1 JP3017978 B1 JP 3017978B1
- Authority
- JP
- Japan
- Prior art keywords
- egr cooler
- brazing material
- nickel brazing
- phase
- nickel
- 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 - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
- F28F21/083—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys from stainless steel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F2009/0285—Other particular headers or end plates
- F28F2009/029—Other particular headers or end plates with increasing or decreasing cross-section, e.g. having conical shape
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
【要約】
【課題】クラック発生やフィレット部表面の脆化相の腐
食に起因する隙間腐食を防止でき、かつ耐食性、耐高温
酸化性、耐繰り返し熱応力性に優れたEGRクーラ接合
用ニッケルろう材、これを使用したEGRクーラの製造
方法、及びEGRクーラを提供すること。
【解決手段】EGRクーラを構成するステンレス鋼製の
部材を接合するために使用されるニッケルろう材を、粉
末状ニッケルろうに、Ni,Cr,Ni−Cr合金,S
USのうち選ばれた金属粉末を4重量%〜22重量%添
加して構成する。Kind Code: A1 A nickel brazing filler metal for EGR cooler joining, which can prevent cracks and crevice corrosion caused by corrosion of an embrittlement phase on the surface of a fillet portion, and has excellent corrosion resistance, high-temperature oxidation resistance, and repetitive thermal stress resistance. And a method of manufacturing an EGR cooler using the same, and an EGR cooler. Kind Code: A1 A nickel brazing material used for joining stainless steel members constituting an EGR cooler is changed to a powdery nickel brazing material by using Ni, Cr, Ni—Cr alloy, S
A metal powder selected from US is added in an amount of 4% by weight to 22% by weight.
Description
【0001】[0001]
【発明の属する技術分野】本発明は、EGRクーラ接合
用ニッケルろう材、これを使用したEGRクーラの製造
方法、及びEGRクーラに係り、特にろう付け組織を改
善することができるEGRクーラ接合用ニッケルろう
材、これを使用したEGRクーラの製造方法、及びEG
Rクーラに関する。The present invention relates to a nickel brazing filler metal for joining an EGR cooler, a method for manufacturing an EGR cooler using the same, and an EGR cooler, and more particularly to a nickel for joining an EGR cooler capable of improving a brazing structure. Brazing material, method of manufacturing EGR cooler using the same, and EG
R cooler.
【0002】[0002]
【従来の技術】従来、EGRクーラにおいて、ステンレ
ス鋼材を使用した部材を接続する場合に、部材の継手を
ニッケルろうを使用したろう付けにより接続することが
ある。2. Description of the Related Art Conventionally, in a case where a member using a stainless steel material is connected in an EGR cooler, a joint of the member may be connected by brazing using a nickel brazing material.
【0003】このニッケルろうは、JISZ3265−
1986にも規定されるように、ニッケル(Ni)を主
成分として、ボロン(B)、珪素(Si)、クロム(C
r)、鉄(Fe)、燐(P)等の添加物を含んだ合金と
して形成されている。これらの添加物は、ろう材の融点
を調整したり、溶融後においてろう材の流動性や部材と
の濡れ性を良好にしたり、硬化後のろう材の靱性を良好
にするものである。[0003] This nickel braze is JISZ3265-
As specified in 1986, nickel (Ni) as a main component, boron (B), silicon (Si), chromium (C
r), an alloy containing additives such as iron (Fe) and phosphorus (P). These additives adjust the melting point of the brazing material, improve the fluidity of the brazing material and the wettability with members after melting, and improve the toughness of the brazing material after curing.
【0004】[0004]
【発明が解決しようとする課題】ところで、このような
ニッケルろう材にあっては、その凝固中に、ろう材は靭
性に富む初晶のNiのα相が母材の界面から晶出するの
で、他のSi、B、P等の金属間化合物からなる脆化相
は最後に凝固する接合部の中央に連続して晶出したり、
フィレット部の表面に晶出しやすい。By the way, in such a nickel brazing material, during solidification, the brazing material is formed because the primary α phase of Ni, which is rich in toughness, crystallizes from the interface of the base material. The embrittlement phase composed of other intermetallic compounds such as Si, B, and P is continuously crystallized at the center of the finally solidified joint,
Crystallizes easily on the surface of the fillet.
【0005】このように、フィレット表面に脆化相が生
成すると、図1に示すように、フィレット部にクラック
が発生しやすくなる。特に、ろう材の塗布量が多い場合
には、フィレット部も過大となりこのフィレット部にク
ラックが発生しやすくなる。そして、このフィレット部
にクラックが発生すると、EGRクーラでは、このろう
付けフィレット部に高温の排気ガス、冷却水、排気ガス
凝縮水等の腐食性の流体が接触するので、これらの腐食
性流体がろう付け部分に発生したクラックに侵入して隙
間腐食が生じることとなる。また、フィレット表面に表
れている脆化相自体も腐食性流体に腐食されやすく、こ
の脆化相が腐食すると隙間腐食が進行することとなる。[0005] When an embrittlement phase is formed on the surface of the fillet as described above, cracks tend to occur in the fillet as shown in FIG. In particular, when the amount of the brazing material applied is large, the fillet portion becomes excessively large, and cracks tend to occur in the fillet portion. When a crack occurs in the fillet portion, a corrosive fluid such as high-temperature exhaust gas, cooling water, or exhaust gas condensed water contacts the brazing fillet portion in the EGR cooler. Crevice corrosion occurs by invading cracks generated in the brazed portion. In addition, the embrittlement phase itself appearing on the surface of the fillet is easily corroded by the corrosive fluid, and if this embrittlement phase corrodes, crevice corrosion will progress.
【0006】そこで、本発明は、ろう付組織を改善し
て、フィレット部での連続した脆化相の晶出を防止する
とともに、フィレット部の表面にNiのα相を多く晶出
させフィレット表面への脆化相の晶出を防止できるもの
として、クラック発生や表面の脆化相の部分的な腐食に
起因する隙間腐食を防止でき、かつ耐食性が良好で、耐
高温酸化性、耐繰り返し熱応力性に優れたEGRクーラ
接合用ニッケルろう材、これを使用したEGRクーラの
製造方法、及びEGRクーラを提供することを目的とす
る。Accordingly, the present invention improves the brazing structure to prevent the crystallization of a continuous embrittlement phase at the fillet portion, and to crystallize a large amount of Ni α phase on the surface of the fillet portion to thereby improve the fillet surface. It can prevent crystallization of the embrittlement phase on the surface, can prevent cracks and crevice corrosion caused by partial corrosion of the embrittlement phase on the surface, has good corrosion resistance, high-temperature oxidation resistance, repetitive heat resistance It is an object of the present invention to provide a nickel brazing filler metal for EGR cooler joining excellent in stress property, a method for manufacturing an EGR cooler using the same, and an EGR cooler.
【0007】[0007]
【課題を解決するための手段】本出願人は、種々の実験
の結果、EGRクーラ接合用粉末状ニッケルろうに、特
定金属の粉末を一定量添加することにより、フィレット
部内での脆化相の連続した晶出を防止でき、また、フィ
レット表面にNiのα相を多く晶出させて脆化相の晶出
を減少させることができることを見出した。As a result of various experiments, the applicant of the present invention has found that a certain amount of a specific metal powder is added to a powdered nickel brazing alloy for EGR cooler joining to thereby reduce the embrittlement phase in the fillet portion. It has been found that continuous crystallization can be prevented, and that a large amount of Ni α phase can be crystallized on the surface of the fillet to reduce the crystallization of the embrittlement phase.
【0008】これにより、フィレット部の脆化相におけ
るクラックの発生を防止すると共に、フィレット部表面
の脆化相からの腐食を防止して、腐食性の流体侵入によ
る隙間腐食を有効に防止することができ、かつ、靱性、
耐食性に優れたNiのα相をフィレット部中に分散して
緻密に晶出させることによってEGRクーラの接合部に
おけるフィレット部の耐高温酸化性の向上、耐繰り返し
熱応力性の向上、接合部の靱性の向上を図ることができ
る。すなわち、上記の課題を解決するための手段は以下
の通りである。Thus, cracks are prevented from occurring in the embrittlement phase of the fillet portion, and corrosion from the embrittlement phase on the surface of the fillet portion is prevented, so that crevice corrosion caused by corrosive fluid penetration is effectively prevented. And toughness,
The α phase of Ni, which has excellent corrosion resistance, is dispersed in the fillet and crystallized densely, thereby improving the high-temperature oxidation resistance of the fillet at the joint of the EGR cooler, the improvement of the repetitive thermal stress resistance, and the improvement of the joint. The toughness can be improved. That is, means for solving the above problems are as follows.
【0009】請求項1に記載の発明は、EGRクーラを
構成するステンレス鋼製の部材を接合するために使用さ
れるニッケルろう材であって、粉末状ニッケルろうに、
Ni,Cr,Ni−Cr合金のうち選ばれた金属粉末を
4重量%〜22重量%添加したニッケルろう材である。The invention according to claim 1 is a nickel brazing material used for joining stainless steel members constituting an EGR cooler.
This is a nickel brazing material to which metal powder selected from Ni, Cr and Ni-Cr alloy is added in an amount of 4 to 22% by weight.
【0010】請求項2に記載の発明は、EGRクーラを
構成するステンレス鋼製の部材を接合するために使用さ
れるニッケルろう材であって、粉末状ニッケルろうに、
Ni,Cr,Ni−Cr合金のうち選ばれた金属粉末を
5重量%〜20重量%添加したニッケルろう材である。According to a second aspect of the present invention, there is provided a nickel brazing material used for joining stainless steel members constituting an EGR cooler.
Ni, Cr, nickel brazing material metal powder selected out of Ni-Cr alloy was added 5 wt% to 20 wt%.
【0011】一般にニッケルろう材が溶融し凝固すると
き、母材界面からNiのα相が成長し最後に凝固するフ
ィレット部の中心及び表面に脆化相が集中する。本発明
に係るニッケルろう材によれば、添加したNi等の粉末
を核としてNiのα相が成長するため、Niのα相がろ
う付け部の全体に分散して緻密に晶出することとなる。
この結果、フィレット部内で脆化相が連続して晶出する
のを防止し、フィレット表面にもNiのα相が多く晶出
し、フィレット部表面での脆化相の晶出を抑制する。In general, when the nickel brazing material is melted and solidified, the α phase of Ni grows from the interface of the base material, and the embrittlement phase is concentrated on the center and the surface of the fillet portion where the nickel solidifies last. According to the nickel brazing material according to the present invention, since the α phase of Ni grows with the powder of the added Ni or the like as a nucleus, the α phase of Ni is dispersed and crystallized densely throughout the brazing portion. Become.
As a result, it is possible to prevent the embrittlement phase from continuously crystallizing in the fillet portion, to crystallize a large amount of Ni phase on the fillet surface, and to suppress the crystallization of the embrittlement phase on the fillet surface.
【0012】このため、本発明に係るニッケルろう材
は、フイレット部でのクラックの発生を防止できると共
に、フィレット部表面の脆化相からの腐食が防止され隙
間腐食の発生を防止できる。また、接合部において耐食
性、靱性が良好なNiのα相が多く晶出するため、排気
ガスや冷却水に対する耐食性、耐高温酸化性、耐繰り返
し熱応力性に富み、EGRクーラの接合に使用すること
によりEGRクーラの耐久性を高いものとすることがで
きる。Therefore, the nickel brazing material according to the present invention can prevent cracks from occurring in the fillet portion, and can prevent corrosion from the embrittlement phase on the surface of the fillet portion, thereby preventing crevice corrosion. In addition, since the α phase of Ni, which has good corrosion resistance and toughness, crystallizes at the joint, it is rich in corrosion resistance to exhaust gas and cooling water, high-temperature oxidation resistance, and repeated thermal stress resistance, and is used for joining EGR coolers. Thus, the durability of the EGR cooler can be increased.
【0013】請求項3に記載の発明は、上記請求項1に
記載のろう材において粉末状Niを添加したニッケルろ
う材である。本発明によれば、粉末状Niを4重量%〜
22重量%、好ましくは4%〜20%添加することによ
り、上記の課題を解決できる。According to a third aspect of the present invention, there is provided a nickel brazing material to which the powdered Ni is added in the brazing material according to the first aspect. According to the present invention, the content of powdered Ni is from 4% by weight to
The above problem can be solved by adding 22% by weight, preferably 4% to 20%.
【0014】上記請求項1乃至3に記載の粉末状Ni等
の添加量の上限及び下限は、表1、表2、及び表3、及
び図1に示した実験結果による。即ち、粉末状Niの添
加量を増加すればするほど、フィレット部におけるNi
のα相の割合は増加するが、添加量を22%を越えるも
のとしてもNiのα相は殆ど増加しない。粉末状Niの
添加量4%以下であると、連続した脆化相が生じてクラ
ックが発生しやすくなる。粉末状Niの添加量を増加し
ていくとクラックの発生を防止でき、粉末状Niを5%
以上添加すると、クラックの発生率は0となる。また、
粉末状Niが多くなるとボイド(空隙)の発生が増加す
る。しかし、表4に示すように、本願出願人は、ボイド
の占有率(面積比)2%(粉末状Niの添加量が22
%)以下であればろう付け部が十分腐食に耐えることを
確認した。The upper and lower limits of the addition amount of the powdered Ni and the like according to claims 1 to 3 are based on Tables 1, 2, and 3 and the experimental results shown in FIG. In other words, the more the amount of powdered Ni added, the higher the Ni content in the fillet portion.
Although the ratio of the α phase increases, the α phase of Ni hardly increases even if the addition amount exceeds 22%. When the addition amount of powdered Ni is 4% or less, a continuous embrittlement phase is generated and cracks are easily generated. Cracking can be prevented by increasing the amount of powdered Ni added, and powdered Ni is reduced by 5%.
With the above addition, the crack generation rate becomes zero. Also,
As the amount of powdered Ni increases, the generation of voids (voids) increases. However, as shown in Table 4, the applicant of the present application reported that the void occupancy (area ratio) was 2% (the amount of powdered Ni added was 22%).
%), It was confirmed that the brazed portion was sufficiently resistant to corrosion.
【0015】また、本発明では、金属粉末としてNiを
使用することにより、ニッケルろう付けに際してNiの
α相が形成されやすいという利点がある。Further, in the present invention, by using Ni as the metal powder, there is an advantage that an α phase of Ni is easily formed at the time of nickel brazing.
【0016】請求項4に記載の発明は、上記請求項1又
は2に記載のろう材において金属粉末として粉末状Cr
を添加したニッケルろう材である。According to a fourth aspect of the present invention, there is provided the brazing material according to the first or second aspect, wherein the metal powder is powdered Cr.
It is a nickel brazing material to which is added.
【0017】また、本発明では、金属粉末としてα相晶
出の核となり易いCrを使用することにより、ニッケル
ろう付けに際してNiのα相が良好に形成される。Further, in the present invention, by using Cr, which is likely to be a nucleus of α phase crystallization, as the metal powder, the α phase of Ni is favorably formed during nickel brazing.
【0018】請求項5に記載の発明は、上記請求項1又
は2に記載のろう材において金属粉末として粉末状Ni
−Cr合金を添加したニッケルろう材である。According to a fifth aspect of the present invention, there is provided the brazing material according to the first or second aspect, wherein the metal powder is powdered Ni.
-It is a nickel brazing material to which a Cr alloy is added.
【0019】本発明では、金属粉末として相晶出の核と
なり易いNi−Cr合金を使用することにより、ニッケ
ルろう付けに際してNiのα相が良好に形成される。In the present invention, by using a Ni--Cr alloy which is likely to be a nucleus for phase crystallization as the metal powder, the .alpha. Phase of Ni is favorably formed during nickel brazing.
【0020】[0020]
【0021】[0021]
【0022】[0022]
【0023】[0023]
【0024】請求項6に記載の発明は、ステンレス鋼か
らなるEGRクーラの部材を接合するに際して、上記請
求項1、請求項2、請求項3、請求項4、又は請求項5
記載のニッケルろう材を使用するEGRクーラの製造方
法である。According to the sixth aspect of the present invention, when joining members of an EGR cooler made of stainless steel, the first, second, third, fourth, or fifth aspect of the present invention is used.
It is a manufacturing method of the EGR cooler which uses the nickel brazing material of description.
【0025】請求項7に記載の発明は、ステンレス鋼か
らなる部材を上記請求項1、請求項2、請求項3、請求
項4又は請求項5記載のニッケルろう材を使用して接合
したEGRクーラである。According to a seventh aspect of the present invention, there is provided an EGR wherein a member made of stainless steel is joined using the nickel brazing material according to the first, second, third, fourth or fifth aspect. Cooler.
【0026】上記請求項6,7に記載の発明によれば、
ニッケルろう材はα相がステンレス鋼製のEGRクーラ
の部品である母材界面からだけでなく、粉末状金属を核
としてろう材相全体に分散して晶出するので、フィレッ
ト中に脆化相が連続して発生することがなくなり、フィ
レット部でのクラックの発生を防止できる。According to the sixth and seventh aspects of the present invention,
In the nickel brazing material, the α phase is dispersed not only from the interface of the base metal, which is a part of the EGR cooler made of stainless steel, but also from the powder metal as a nucleus and crystallizes throughout the brazing material phase. Does not occur continuously, and the occurrence of cracks in the fillet portion can be prevented.
【0027】また、本発明に係るEGRクーラに使用す
るニッケルろう材にあっては、フィレット表面にNiの
α相が多く晶出してフィレット部表面に脆化相が晶出す
ることが少なくなるので、表面の脆化相からの隙間腐食
の発生を有効に防止することができる。更に、靱性、耐
食性に優れたNiのα相がフィレット部中に分散して緻
密に晶出しているので、EGRクーラの接合部における
フィレット部の耐高温酸化性の向上、耐繰り返し熱応力
の向上、接合部の靱性の向上、冷却水の塩素イオン、排
気ガス凝縮水による隙間腐食の防止を有効に図ることが
でき、耐久性に優れたEGRクーラを得ることができ
る。Further, in the nickel brazing filler metal used in the EGR cooler according to the present invention, a large amount of Ni α phase is crystallized on the surface of the fillet and an embrittlement phase is less likely to crystallize on the surface of the fillet. In addition, the occurrence of crevice corrosion from the embrittlement phase on the surface can be effectively prevented. Furthermore, since the α phase of Ni, which is excellent in toughness and corrosion resistance, is dispersed and densely crystallized in the fillet portion, the high temperature oxidation resistance of the fillet portion at the joint portion of the EGR cooler and the improvement of the repetitive thermal stress resistance are improved. In addition, it is possible to effectively improve the toughness of the joint and to prevent crevice corrosion due to the chlorine ion of the cooling water and the condensed water of the exhaust gas, so that an EGR cooler having excellent durability can be obtained.
【0028】[0028]
【発明の実施の形態】以下、本発明に係るEGRクーラ
接合用ニッケルろう材、これを使用したEGRクーラの
製造方法、及びEGRクーラの実施の形態について説明
する。本例は本発明をステンレス鋼製のEGRクーラを
製造する場合に適用した場合を示すものである。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a nickel brazing material for joining an EGR cooler, a method of manufacturing an EGR cooler using the same, and an embodiment of the EGR cooler according to the present invention will be described below. This example shows a case where the present invention is applied to the case of manufacturing an EGR cooler made of stainless steel.
【0029】本例は図3に示すように、排気ガスを吸気
に返還するEGRシステムの排気ガスを冷却するEGR
クーラ9のシェル10の鏡板13に冷却媒体(例えば
水)を通すチューブ11を取り付けるのに使用される
他、上記チューブ11と鏡板13との接合、鏡板13と
シェル10、シェル10と蓋部材14、シェル10とパ
イプ15との接合にも使用される。すなわち、チューブ
11と鏡板13との取付部、その他の取付部に上記ろう
材を塗布して、真空炉で全体を加熱して、ろう材をチュ
ーブ11と鏡板13との間等の隙間に流入させるもので
ある。In this embodiment, as shown in FIG. 3, an EGR system for cooling exhaust gas of an EGR system for returning exhaust gas to intake air
In addition to attaching a tube 11 for passing a cooling medium (for example, water) to a head plate 13 of a shell 10 of the cooler 9, bonding the tube 11 to the head plate 13, the head plate 13 and the shell 10, the shell 10 and the lid member 14 , Is also used for joining the shell 10 and the pipe 15. That is, the brazing material is applied to the mounting portion between the tube 11 and the end plate 13 and the other mounting portions, and the whole is heated in a vacuum furnace, so that the brazing material flows into a gap such as between the tube 11 and the end plate 13. It is to let.
【0030】本例に係るEGRクーラによれば、EGR
ガス、冷却水等が直接接触する部分に本発明に係るニッ
ケルろう材を使用しており、接合部に高耐食性のNiの
α相が多く晶出しているので耐高温酸化性が向上する。
また、本例に係るEGRクーラによれば、ニッケルろう
での接合部は靱性の大きなNiのα相が分散して緻密に
晶出しているのでくり返し熱応力に耐えるものとでき
る。According to the EGR cooler according to this embodiment, the EGR cooler
The nickel brazing material according to the present invention is used in a portion where gas, cooling water and the like come into direct contact, and a high corrosion-resistant Ni α-phase is crystallized at the joint, so that high-temperature oxidation resistance is improved.
Further, according to the EGR cooler according to the present embodiment, since the α phase of Ni having high toughness is dispersed and crystallized densely at the joint portion with nickel brazing, it can endure repeated thermal stress.
【0031】更に、本例に係るEGRクーラによれば、
接合部のフィレット部は靱性が高くクラックが入りにく
いうえ、フィレット部表面は、高い耐食性を備えたNi
のα相が多く晶出しているため、塩素イオンを含んだ冷
却水による隙間腐食、腐食性の高い排気ガス凝縮水に対
しても高い耐食性を得ることができる。Further, according to the EGR cooler according to the present embodiment,
The fillet portion of the joint has high toughness and is hard to crack, and the surface of the fillet portion is made of Ni having high corrosion resistance.
Because a large amount of the α phase is crystallized, high corrosion resistance can be obtained even with crevice corrosion due to cooling water containing chlorine ions and highly corrosive exhaust gas condensate.
【0032】[0032]
【実施例】出願人は、Ni粉末添加量を変化させたニッ
ケルろう材を用いろう付けを行い、それらについて断面
観察、試験を行った。EXAMPLES The applicant carried out brazing using a nickel brazing material in which the amount of Ni powder added was changed, and performed cross-sectional observations and tests on them.
【0033】本実施例は、粉末状ニッケルろうにNi粉
末の混入率を変更して作成したニッケルろう材を用いて
母材を接合した試験片を作成し、これらの接合部断面を
拡大観察して、ボイドの有無とその面積、クラックの有
無、及びNiのα相の占有面積を測定し、ボイドとNi
のα相に関してはその接合部に対する割合を算出した。In this embodiment, a test piece was prepared by joining a base material using a nickel brazing material prepared by changing the mixing ratio of Ni powder into a powdery nickel brazing material, and the cross section of these joints was observed under magnification. Then, the presence or absence of voids and their area, the presence or absence of cracks, and the area occupied by the α phase of Ni are measured.
The ratio of the α phase to the joint was calculated.
【0034】本例では粉末状ニッケルろうとして、JI
SZ3265−1986に規定されるBNi−5の粉末
状ニッケルろうに、金属粉末として平均粒径20μm以
下の粉末状Niを所定量混入してニッケルろう材とした
ものである。In this example, the powdered nickel brazing material is JI
A nickel brazing material is prepared by mixing a predetermined amount of powdered Ni having an average particle diameter of 20 μm or less as a metal powder into a powdered nickel solder of BNi-5 specified in SZ3265-1986.
【0035】この例では、図4、及び図5に示すよう
に、試験片はステンレス鋼製(SUS304)の板材2
2〔W20,L30,T5〕に板材21〔W10,L1
5,T5〕を100μmのタングステン線25を挟んで
重ね、板材21の長辺に上記ニッケルろう材24を5g
合成樹脂バインダで混練したものを塗り付け、試験片を
真空炉で加熱して作成した。In this example, as shown in FIGS. 4 and 5, the test piece was a plate material 2 made of stainless steel (SUS304).
2 [W20, L30, T5] and plate material 21 [W10, L1
5, T5] with a 100 μm tungsten wire 25 interposed therebetween, and 5 g of the nickel brazing material 24 on the long side of the plate material 21.
A mixture kneaded with a synthetic resin binder was applied, and the test piece was prepared by heating in a vacuum furnace.
【0036】なお、上記タングステン線25は、実際に
ろう付けする材料の表面加工の誤差の最大値を考慮して
両試験片の間に挟んだものである。溶解したニッケルろ
う材24は、両板材21,22間の隙間に毛細管現象に
よって入り込んで、板材と板材との間を埋めた。そし
て、板材21と板材22との間を埋めて余ったろう材は
板材の隅部にフィレット部を形成した。The tungsten wire 25 is interposed between the two test pieces in consideration of the maximum error in the surface processing of the material to be actually brazed. The melted nickel brazing material 24 entered the gap between the two plate members 21 and 22 by capillary action, and filled the space between the plate members. Then, the brazing filler metal that filled the space between the plate 21 and the plate 22 formed a fillet portion at a corner of the plate.
【0037】この実験を、粉末状Niの混入重量%を変
更して行い、それぞれの試験片を切断して顕微鏡で拡大
観察し所定の項目について検査を行い、各項目について
評価を行った。これらの結果を表1〜表3及び図2に示
す。また、このフィレット部の顕微鏡写真を図6に示
す。この写真は粉末状Niを15重量%添加した例を示
しており、フィレット部の内部及び表面にNiのα相が
多量に晶出していることがわかる。This experiment was carried out by changing the weight percent of powdered Ni mixed. Each test piece was cut, observed under a microscope, inspected for predetermined items, and evaluated for each item. The results are shown in Tables 1 to 3 and FIG. FIG. 6 shows a micrograph of the fillet portion. This photograph shows an example in which 15% by weight of powdered Ni was added, and it can be seen that a large amount of the α phase of Ni was crystallized inside and on the surface of the fillet.
【0038】[0038]
【表1】 [Table 1]
【0039】[0039]
【表2】 [Table 2]
【0040】[0040]
【表3】 [Table 3]
【表4】 [Table 4]
【0041】これらの結果から、以下のことがわかる。
粉末状Niの添加量を増やすとボイドの発生量が増え、
粉末状Niの添加量が22%を越えると、ボイドの発生
量が急激に増加する。粉末状Niを4%添加するだけで
フィレット部にクラックは発生しない。粉末状Niの添
加量を増やすとNiのα相は増加するが、粉末状Niの
添加量が20%を越えてもそのNiのα相の占有面積は
ほとんど増加しない。From these results, the following can be understood.
Increasing the amount of powdered Ni increases the amount of voids generated,
If the amount of powdered Ni exceeds 22%, the amount of voids increases sharply. No crack is generated in the fillet portion only by adding 4% of powdered Ni. When the amount of powdered Ni is increased, the α phase of Ni increases, but even when the amount of powdered Ni exceeds 20%, the area occupied by the α phase of Ni hardly increases.
【0042】また、本願出願人は、表4に示すように、
ボイドが面積比で2%程度までは、腐食に対して影響が
少ないことを確認した。このため、粉末状Niの添加量
が22%以下であれば、ボイドを原因とする腐食の影響
は無視できることがわかる。また、Niの添加量が20
%以下であれば、ボイドを原因とする腐食の影響は完全
に無視できることがわかる。この実験は、EGRクーラ
を種々の金属粉末添加量のニッケルろう材で作成し、こ
のEGRクーラに塩素イオンを含んだ粗悪冷却水相当の
冷却水流し、一ヵ月後、EGRクーラの各部を切り出し
て、組織検査を行い隙間腐食の有無を確認したものであ
る。As shown in Table 4, the applicant of the present application
It was confirmed that up to about 2% of the area ratio of the void had little effect on corrosion. For this reason, if the amount of powdered Ni added is 22% or less, the effect of corrosion due to voids can be ignored. When the amount of Ni added is 20
%, The effect of corrosion caused by voids can be completely ignored. In this experiment, an EGR cooler was made of nickel brazing filler metal with various amounts of metal powder added, a cooling water equivalent to poor cooling water containing chlorine ions was flowed into the EGR cooler, and one month later, each part of the EGR cooler was cut out. In addition, the presence of crevice corrosion was confirmed by conducting a microstructure inspection.
【0043】このことから、粉末状Niはニッケルろう
材に対して4重量%〜22重量%添加することが有効で
あることがわかる。すなわち、この割合で粉末Niを添
加することで、ボイドによる腐食の影響を抑えつつ、十
分な量のNiのα相を晶出させ、かつ、クラックの発生
を低減させることができる。This indicates that it is effective to add 4 to 22% by weight of powdered Ni to the nickel brazing material. That is, by adding powder Ni at this ratio, it is possible to suppress the influence of corrosion due to voids, crystallize a sufficient amount of the α phase of Ni, and reduce the occurrence of cracks.
【0044】また、クラックの発生を完全に無くし、か
つボイドによる影響を極力少なくするとともに、十分に
Niのα相を晶出させるためには、粉末状Niの添加量
は、5重量%〜20重量%とすると良いことがわかる。Further, in order to completely eliminate the occurrence of cracks, minimize the effects of voids, and sufficiently crystallize the α phase of Ni, the amount of powdered Ni added is 5% by weight to 20% by weight. It is understood that it is better to set the weight%.
【0045】[0045]
【発明の効果】以上説明したように、本発明にかかるE
GRクーラ接合用ニッケルろう材によれば、粉末状ニッ
ケルろうに、Ni,Cr,Ni−Cr合金のうち選ばれ
た金属粉末を4重量%〜22重量%、好ましくは5重量
%〜20重量%添加したので、ニッケルろう材はα相が
ステンレス鋼製のEGRクーラの部品である母材界面か
らだけでなく、粉末状金属を核としてろう材相全体に分
散して晶出するものとなり、フィレット中に脆化相が連
続して発生することがなくなり、フィレット部でのクラ
ックの発生を防止でき、隙間腐食を有効に防止できる。As described above, the E according to the present invention is described.
According to GR cooler bonding nickel brazing material, the powdered nickel brazing, Ni, Cr, a metal powder selected out of Ni-Cr alloy 4 wt% to 22 wt%, preferably from 5 wt% to 20 wt Since the nickel brazing material is added, the α-phase is dispersed not only from the interface of the base metal, which is a component of the stainless steel EGR cooler, but also dispersed and crystallized throughout the brazing material phase with the powder metal as a nucleus. The embrittlement phase is not continuously generated in the fillet, so that cracks at the fillet portion can be prevented, and crevice corrosion can be effectively prevented.
【0046】また、靱性、耐食性に優れたNiのα相が
フィレット部中に分散して緻密に晶出しているので、E
GRクーラの接合部におけるフィレット部の耐高温酸化
性の向上、耐繰り返し熱応力の向上、接合部の靱性の向
上を図ることができる。更に、フィレット部表面にNi
のα相が多く晶出してフィレット部表面に脆化相が晶出
することが少なくなるので、表面の脆化相からの隙間腐
食の発生を有効に防止することができると共に、EGR
ガス、冷却水中の塩素イオン、排気ガス凝縮水による隙
間腐食の防止を有効に図ることができる。したがって、
本発明によれば、耐久性に優れたEGRクーラを得るこ
とができる。Further, since the α phase of Ni excellent in toughness and corrosion resistance is dispersed in the fillet portion and crystallized densely,
It is possible to improve the high-temperature oxidation resistance of the fillet portion at the junction of the GR cooler, to improve the repetitive thermal stress, and to improve the toughness of the junction. In addition, Ni
Crystallization of the embrittlement phase on the surface of the fillet portion is reduced, so that crevice corrosion from the embrittlement phase on the surface can be effectively prevented.
It is possible to effectively prevent crevice corrosion caused by gas, chlorine ions in cooling water and condensed water of exhaust gas. Therefore,
According to the present invention, an EGR cooler having excellent durability can be obtained.
【図1】従来のニッケルろう材を用いたろう付けフレッ
ト部の断面の顕微鏡写真を示す中間調画像である。FIG. 1 is a halftone image showing a micrograph of a cross section of a brazing fret portion using a conventional nickel brazing material.
【図2】本発明に係るEGRクーラ接合用ニッケルろう
材の粉末添加量とろう付特性との関係を示すグラフであ
る。FIG. 2 is a graph showing the relationship between the amount of powder added and the brazing characteristics of the nickel brazing filler metal for EGR cooler joining according to the present invention.
【図3】本発明が適用されるEGRのクーラのシェルを
示す図であり、(1)は縦断面図、(2)はii方向から
の側面図、(3)は(1)中のiii 部の拡大図である。FIG. 3 is a view showing a shell of a cooler of an EGR to which the present invention is applied, (1) is a longitudinal sectional view, (2) is a side view from the ii direction, and (3) is iii in (1). It is an enlarged view of a part.
【図4】本発明の実施例に示した試験片の接続状態を示
す斜視図である。FIG. 4 is a perspective view showing a connection state of test pieces shown in the example of the present invention.
【図5】本発明の実施例に示した試験片の接続状態を示
す三面図である。FIG. 5 is a three-view drawing showing a connection state of test pieces shown in the example of the present invention.
【図6】本発明の実施例に係るニッケルろう材を用いた
ろう付けフレット部の断面の顕微鏡写真を示す中間調画
像である。FIG. 6 is a halftone image showing a micrograph of a cross section of a brazing fret portion using a nickel brazing material according to an example of the present invention.
フロントページの続き (58)調査した分野(Int.Cl.7,DB名) B23K 35/30 310 B23K 1/00 330 F28D 1/06 F28D 7/16 Continuation of the front page (58) Field surveyed (Int. Cl. 7 , DB name) B23K 35/30 310 B23K 1/00 330 F28D 1/06 F28D 7/16
Claims (7)
の部材を接合するために使用されるニッケルろう材であ
って、粉末状ニッケルろうに、Ni,Cr,Ni−Cr
合金のうち選ばれた金属粉末を4重量%〜22重量%添
加したニッケルろう材。1. A nickel brazing material used for joining stainless steel members constituting an EGR cooler, comprising a powdered nickel brazing material, Ni, Cr, Ni-Cr.
Metal powders selected among the alloys of 4 wt% to 22 wt% addition of nickel brazing material.
の部材を接合するために使用されるニッケルろう材であ
って、粉末状ニッケルろうに、Ni,Cr,Ni−Cr
合金のうち選ばれた金属粉末を5重量%〜20重量%添
加したニッケルろう材。2. A nickel brazing material used for joining stainless steel members constituting an EGR cooler, comprising a powdered nickel brazing material, Ni, Cr, Ni-Cr.
Adding a metal powder selected out of alloy 5 wt% to 20 wt% nickel brazing material.
求項1又は請求項2記載のニッケルろう材。3. The nickel brazing material according to claim 1, wherein powdered Ni is added as the metal powder.
求項1又は請求項2記載のニッケルろう材。4. The nickel brazing material according to claim 1, wherein powdered Cr is added as the metal powder.
添加した請求項1又は請求項2記載のニッケルろう材。5. The nickel brazing material according to claim 1, wherein a powdery Ni—Cr alloy is added as the metal powder.
材を接合するに際して、上記請求項1、請求項2、請求
項3、請求項4、又は請求項5記載のニッケルろう材を
使用するEGRクーラの製造方法。 6. An EGR cooler part made of stainless steel.
Claims 1, 2, and 3 when joining materials
The nickel brazing material according to claim 3, 4, or 5
Manufacturing method of the EGR cooler to be used.
請求項1、請求項2、請求項3、請求項4、又は請求項
5記載のニッケルろう材を使用して接合したEGRクー
ラ。 7. The two members made of stainless steel are
Claim 1, Claim 2, Claim 3, Claim 4, or Claim
5. An EGR cooler joined using the nickel brazing material according to 5.
La.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28387898A JP3017978B1 (en) | 1998-10-06 | 1998-10-06 | Nickel brazing filler metal for EGR cooler joining, method of manufacturing EGR cooler using the same, and EGR cooler |
EP98119127A EP0908265B1 (en) | 1997-10-09 | 1998-10-09 | Nickel-based brazing material, method of brazing with the brazing material, process for producing EGR cooler with the brazing material, and EGR cooler |
DE69837056T DE69837056T2 (en) | 1997-10-09 | 1998-10-09 | Use of a nickel-based brazing material for brazing stainless steel components to produce an exhaust gas recirculation cooler |
DE69830115T DE69830115T2 (en) | 1997-10-09 | 1998-10-09 | Nickel-based brazing material, brazing method with this material, and method of manufacturing an exhaust gas recirculation cooler |
EP04024668A EP1495831B1 (en) | 1997-10-09 | 1998-10-09 | Use of a nickel-based brazing material for bonding stainless-steel members for constituting an EGR cooler, process for producing an EGR cooler, EGR cooler |
US09/168,904 US6257483B1 (en) | 1997-10-09 | 1998-10-09 | Nickel-based brazing material, method of brazing with the brazing material, process for producing EGR cooler with the brazing material, and EGR cooler |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28387898A JP3017978B1 (en) | 1998-10-06 | 1998-10-06 | Nickel brazing filler metal for EGR cooler joining, method of manufacturing EGR cooler using the same, and EGR cooler |
Publications (2)
Publication Number | Publication Date |
---|---|
JP3017978B1 true JP3017978B1 (en) | 2000-03-13 |
JP2000107883A JP2000107883A (en) | 2000-04-18 |
Family
ID=17671357
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Application Number | Title | Priority Date | Filing Date |
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JP28387898A Expired - Lifetime JP3017978B1 (en) | 1997-10-09 | 1998-10-06 | Nickel brazing filler metal for EGR cooler joining, method of manufacturing EGR cooler using the same, and EGR cooler |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008132864A1 (en) | 2007-04-25 | 2008-11-06 | Ihi Corporation | Clad sheet and process for manufacturing the same |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6749104B2 (en) * | 2000-09-15 | 2004-06-15 | Anatol Rabinkin | Heat exchanger manufacturing methods and brazing filler metal compositions useful therein, characterized by low nickel leaching rates |
JP4492342B2 (en) | 2004-12-24 | 2010-06-30 | 日立電線株式会社 | Brazing clad material, brazing method using the same, and brazed product |
JP2006334606A (en) * | 2005-05-31 | 2006-12-14 | Hitachi Cable Ltd | Brazing filler metal, composite material for brazing, and brazed product using them |
JP2008275183A (en) * | 2007-04-25 | 2008-11-13 | Ihi Corp | Heat exchanger, manufacturing method of heat exchanger and egr system |
KR20160119255A (en) * | 2009-07-27 | 2016-10-12 | 닛신 세이코 가부시키가이샤 | Ferritic stainless steel for egr cooler and egr cooler |
JP6871045B2 (en) * | 2017-03-31 | 2021-05-12 | 日鉄ステンレス株式会社 | Ferritic stainless steel and Ni brazed joint members with excellent brazing and corrosion resistance |
-
1998
- 1998-10-06 JP JP28387898A patent/JP3017978B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
溶接学会全国大会講演概要 第46集,pp.172−173(平成2年3月4日発行) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008132864A1 (en) | 2007-04-25 | 2008-11-06 | Ihi Corporation | Clad sheet and process for manufacturing the same |
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