KR100438002B1 - Bonding process of Al flange/Bronze wheel containing diamond for precision cutting - Google Patents
Bonding process of Al flange/Bronze wheel containing diamond for precision cutting Download PDFInfo
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- KR100438002B1 KR100438002B1 KR10-2001-0046341A KR20010046341A KR100438002B1 KR 100438002 B1 KR100438002 B1 KR 100438002B1 KR 20010046341 A KR20010046341 A KR 20010046341A KR 100438002 B1 KR100438002 B1 KR 100438002B1
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- bonding
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- bronze alloy
- based binder
- aluminum flange
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/18—Dissimilar materials
Abstract
개시된 내용은 구리(Cu)에 주석(Sn)이 10중량% 첨가된 분말형청동합금에, 니켈(Ni), 코발트(Co) 혹은 크롬(Cr)을 각각 10중량%이하 첨가하고 동시에 다이아몬드(diamond)를 3에서 15체적%를 첨가하여 소결(sintering) 제조함으로써 휠(wheel)과 알루미늄을 접합하여 일체화시키는 접합방법을 특징으로 한다.Disclosed is that 10% by weight of nickel (Ni), cobalt (Co) or chromium (Cr) is added to a powder-type bronze alloy in which 10% by weight of tin (Sn) is added to copper (Cu) and diamond simultaneously. ) Is manufactured by sintering by adding 3 to 15% by volume, thereby joining and integrating a wheel and aluminum.
또한, 본 발명에 의한 다이아몬드가 첨가된 청동합금계결합재와 알루미늄플랜지의 접합방법은 400℃-560℃온도의 범위에서 60분 이하의 유지시간동안 불활성가스분위기(Ar, N2등) 혹은 진공분위기 중에서 접합시 10-40MPa압력 하에서 실시하는 것을 특징으로 한다.In addition, according to the present invention, the diamond-bonded bronze alloy-based binder and the aluminum flange are bonded in an inert gas atmosphere (Ar, N 2, etc.) or in a vacuum atmosphere for a holding time of 60 minutes or less in a temperature range of 400 ° C.-560 ° C. It is characterized in that it is carried out under the pressure of 10-40MPa at the time of joining.
상기의 고상확산접합방법에 의하면, 접합시 접합계면에 발생할 수 있는 금속간화합물과 같은 반응물의 두께는 150㎛이하로 하면 높은 접합강도를 달성할 수 있게 된다.According to the solid-state diffusion bonding method described above, when the thickness of a reactant such as an intermetallic compound, which may occur at the bonding interface during bonding, is 150 μm or less, high bonding strength can be achieved.
Description
본 발명은 다이아몬드가 첨가된 청동합금계결합재와 알루미늄플랜지 접합체의 우수한 접합강도를 얻기 위하여 사용되는 접합방법에 관한 것으로, 보다 상세하게는 소정의 온도, 압력 및 분위기하에서 고상확산접합시켜 접합계면에 발생하는 금속간화합물을 억제시키는 접합방법에 관한 것이다.The present invention relates to a bonding method used to obtain excellent bonding strength of a bronze alloy-based binder and an aluminum flange bonded to which diamond is added. More particularly, the present invention relates to a solid state diffusion bonding under a predetermined temperature, pressure, and atmosphere to generate a bonding interface. It relates to a bonding method for suppressing intermetallic compounds.
종래, 알루미늄플랜지에 도금한 절삭가공용 휠의 다이아몬드를 접합시키는 방법으로는, 전해질도금(Electro plating) 혹은 무전해질(Electroless plating)으로 전착시킨 방법이 널리 사용되어 왔다.Conventionally, as a method of bonding the diamond of the cutting wheel plated to the aluminum flange, electrodeposition by electroplating or electroless plating has been widely used.
그러나, 다음과 같은 몇가지 문제점이 있었다.However, there are some problems as follows.
첫째, 종래 전착으로 다이아몬드를 알루미늄플랜지에 도금한 절삭가공용 휠은 접합강도가 불충분하여 실리콘웨이퍼와 같이 경도가 높은 피가공재를 가공할 때 다이아몬드가 이탈되는 단점이 있었다.First, the cutting wheels in which diamonds are plated on aluminum flanges by conventional electrodeposition have insufficient bonding strength, so that diamonds are separated when processing a workpiece having a high hardness, such as a silicon wafer.
둘째, 특히 실리콘와이퍼 표면에 폴리머계통의 화학제품이 피복되어 있는 경우 절삭가공휠로부터 다이아몬드의 이탈이 특히 심하게 발생하였다.Second, the separation of diamonds from the cutting wheels was particularly severe when the polymer-based chemicals were coated on the silicon wiper surface.
셋째, 전착된 다이아몬드의 두께가 매우 얇아 장시간 사용할 수 없었다.Third, the electrodeposited diamond was very thin and could not be used for a long time.
한편, 절삭가공용 휠(Wheel)은 절삭 및 연삭시 고속으로 회전하므로 다이아몬드결합재와 플랜지(Flange)간의 결합력이 중요하다. 일반적으로 다이아몬드결합재와 플랜지(Flange)간의 결합은 용융접합, 전착법, Laser방법으로 실시되고 있으나 접합시 접합계면에서 발생되는 결함과 냉각시 접합계면에서의 열팽창계수에 의한 잔류응력이 발생되기 때문에, 파괴가 발생된다.On the other hand, since the cutting wheel (Wheel) rotates at high speed during cutting and grinding, the bonding force between the diamond binder and the flange (Flange) is important. In general, the bonding between the diamond binder and the flange is performed by melt bonding, electrodeposition, or laser, but defects in the bonding interface during bonding and residual stress due to thermal expansion coefficient in the bonding interface during cooling are generated. Destruction occurs.
그러므로, 접합강도 및 신뢰도가 높은 접합체를 개발하기 위해서는 접합체내에 발생되는 잔류응력의 크기를 최소화하여야 하며, 작업공정을 간략하게 하기 위해서는 접합부의 설계기술 개발이 요구되고 접합부의 신뢰성을 확보하기 위하여 새로운 접합법이 이용되어야 한다.Therefore, in order to develop a joint with high joint strength and reliability, the amount of residual stress generated in the joint should be minimized. In order to simplify the work process, development of joint design technology is required, and a new joint method is required to secure the joint reliability. This should be used.
고상확산접합법은 물성이 서로 다른 이종금속과의 접합이 가능하고, 기존의 용융접합(브레이징, 솔더링, Laser방법)과는 달리 접합부의 미세조직이 변할 위험이 적기 때문에 우수한 접합특성을 얻을 수 있다.The solid phase diffusion bonding method is capable of bonding with dissimilar metals having different physical properties, and unlike conventional melt bonding (brazing, soldering, and laser methods), it is possible to obtain excellent bonding characteristics because there is little risk of changing the microstructure of the joint.
따라서, 청동합금에 니켈, 크롬 또는 코발트를 각각 첨가하고 여기에 다이아몬드를 첨가하여 청동합금계결합재를 제조한 후, 이것을 알루미늄플랜지와 고상접합시킴으로써 청동합금계결합재와 알루미늄플랜지(shank부)간의 접합계면을 최적조건으로 유지시켜야 한다.Therefore, after the addition of nickel, chromium or cobalt to the bronze alloy, diamond is added thereto to produce a bronze alloy-based binder, and then bonded to the aluminum flange and the solid-phase bonding interface between the bronze alloy-based binder and the aluminum flange (shank part). Should be kept in optimum condition.
일반적으로 청동합금이 알루미늄플랜지와 접합하면 접합계면에 기계적 특성에 나쁜 영향을 미치는 금속간 화합물(CuAl Cu2Al Cu9Al4 등)이 생성된다는 보고가 있고, 이것들은 접합 중에 발생한다고 알려진다.In general, when a bronze alloy is bonded with an aluminum flange, it is reported that an intermetallic compound (CuAl Cu 2 Al Cu 9 Al 4, etc.), which adversely affects mechanical properties, is generated at the bonding interface, and these are known to occur during bonding.
금속간화합물의 존재를 최소화하기 위해서는 용융접합법(솔더링, 브레이징, Laser법)에 비하여 고상확산접합법이 유리한데, 이는 고상확산접합법이 두 모재의 융점이하에서 작업이 실시되므로 냉각과정 중 발생할 수 있는 응고조직의 변화 및 중간생성물의 생성을 최소화하고 서로 다른 이종금속의 열팽창계수로 인한 접합계면의 파괴를 최소화할 수 있기 때문이다.In order to minimize the presence of intermetallic compounds, solid phase diffusion bonding is more advantageous than melt bonding (soldering, brazing, and laser methods). Solid phase diffusion bonding is performed under the melting point of two base materials. This is because the change of the structure and the formation of intermediate products can be minimized and the breakage of the bonding interface due to the thermal expansion coefficients of different dissimilar metals can be minimized.
전술한 문제를 해결하기 위한 본 발명의 목적은, 상기 다이아몬드가 첨가된 청동합금계결합재와 알루미늄플랜지가 접합된 접합체의 접합계면에서, 청동합금과 알루미늄을 금속결합시키고 이때 다이아몬드는 전위(Dislocation)의 이동을 고정시키는 핀(pine)역할을 하도록 함으로써 기계적강도를 향상시키는 장점과 함께, 고상확산법으로 접합시켜 접합계면에 발생할 수 있는 금속간화합물을 최소화시켜 접합강도의 감소를 억제시키는데 있다.An object of the present invention for solving the above problems is, in the bonding interface of the bronze alloy-bonded material and the aluminum flange bonded to the diamond is added, the metal alloy of the bronze alloy and the diamond is dislocation (Dislocation) of In addition to the advantage of improving the mechanical strength by acting as a pin (pin) to fix the movement, by the solid-phase diffusion method to minimize the intermetallic compounds that can occur in the bonding interface to suppress the reduction of the bonding strength.
또한, 본 발명의 다른 목적은 작업공정의 단순화를 통해 생산비 및 공정수를 절감할 수 있도록 하는, 다이아몬드가 첨가된 청동합금계결합재와 알루미늄플랜지의 접합방법을 제공함에 있다.In addition, another object of the present invention is to provide a method of joining an aluminum flange with a bronze alloy-based binder added with diamond, which can reduce the production cost and the number of processes by simplifying the work process.
본 발명은 청동합금에 니켈, 크롬 또는 코발트를 첨가하고 여기에 다이아몬드를 첨가하여 청동합금계결합재를 제조한 후, 이것을 알루미늄플랜지와 고상접합시킴으로써 청동합금계결합재와 알루미늄플랜지(shank부)간의 접합계면을 최적조건으로 유지시켜야 함을 그 목적으로 한다.In the present invention, nickel, chromium or cobalt is added to a bronze alloy, and diamond is added thereto to prepare a bronze alloy-based binder, and the bonding interface between the bronze-alloy-based binder and the aluminum flange (shank part) is obtained by solid-state bonding the aluminum alloy with the aluminum flange. The aim is to maintain the optimum condition.
도 1은 본 발명에 따른 청동합금계결합재와 알루미늄플랜지를 확산접합한 뒤에 접합계면에 발생한 금속간화합물의 두께를 접합시간에 따른 변화로 나타낸 그래프이다.1 is a graph showing the thickness of the intermetallic compound generated at the bonding interface after the diffusion bonding of the bronze alloy-based binder and the aluminum flange according to the present invention according to the bonding time.
도 2는 본 발명에 따른 청동합금계결합재에서 각각 니켈, 크롬, 코발트의 첨가량을 증가시켜 알루미늄플랜지를 확산접합한 뒤의 반응층의 두께를 나타낸 그래프이다.Figure 2 is a graph showing the thickness of the reaction layer after diffusion bonding aluminum flange by increasing the addition amount of nickel, chromium, cobalt in the bronze alloy binder according to the present invention, respectively.
도 3은 본 발명에 따르는 청동합금계결합재와 알루미늄플랜지의 접합계면에서의 경도값 분포를 나타내는 그래프이다.3 is a graph showing the distribution of hardness values at the bonding interface between the bronze alloy-based binder and the aluminum flange according to the present invention.
전술한 목적을 달성하고자 하는 본 발명은, 청동합금에 니켈, 크롬 또는 코발트를 각각 최대 10% 첨가하고 여기에 다이아몬드를 3 내지 15체적%로 첨가하여 제조한 청동합금계결합재와 순도 99%이상의 알루미늄플랜지를 고상확산접합법으로 접합시킴으로써 달성된다.In order to achieve the above object, the present invention is a bronze alloy-based binder prepared by adding up to 10% of nickel, chromium or cobalt to the bronze alloy, and adding 3 to 15 vol% of diamond thereto, and aluminum having a purity of 99% or more. This is achieved by joining the flanges by solid phase diffusion bonding.
이때 청동합금계결합재와 알루미늄플랜지의 두께는 각각 2 내지 20mm이하로 하고 접합계면을 45°이하로 각각 가공하여 접합계면의 접합면적을 최대한 확보하는 것이 바람직하다.At this time, the thickness of the bronze alloy-based binder and the aluminum flange is preferably 2 to 20mm or less and the joint interface is processed to 45 ° or less, respectively, to secure the maximum joint area of the joint interface.
또한, 알루미늄의 융점을 고려하여 400 내지 560℃의 접합온도에서, 접합계면의 반응층이 150㎛이하로 제어되도록 하기 위하여 30MPa전후의 압력을 가하여 5 내지 60분동안 접합하는 단계 및 상기 청동합금계결합재와 알루미늄플랜지의 접합체를 노냉 혹은 50℃/초 이하의 속도로 냉각시키는 단계를 포함하는 고상확산접합법으로 달성된다.In addition, at the bonding temperature of 400 to 560 ℃ considering the melting point of aluminum, in order to control the reaction layer of the bonding interface to 150㎛ or less by applying a pressure before and after 30MPa for 5 to 60 minutes and the bronze alloy system It is achieved by a solid-phase diffusion bonding method comprising the step of cooling the bonding material of the binder and the aluminum flange at a rate of no cooling or 50 ° C./sec or less.
이때, 상기의 접합단계는 진공, 불활성가스(N2,Ar등) 혹은 환원성분위기(H2)중에서 수행한다.At this time, the bonding step is carried out in a vacuum, inert gas (N 2 , Ar, etc.) or reducing component (H 2 ).
또한, 본 발명의 청동합금계결합재와 알루미늄플랜지의 접합은 열팽창계수가 차이가 나므로 접합하려는 두 재료의 융점이하의 고상상태에서 접합을 수행한다.In addition, the bonding of the bronze alloy-based binder and the aluminum flange of the present invention has a different thermal expansion coefficient, so that the bonding is performed in a solid state below the melting point of the two materials to be joined.
본 발명에서, 청동합금에 첨가된 다이아몬드, 크롬, 니켈, 코발트는 청동합금에 고용 혹은 석출되어 청동합금계결합재의 기계적 특성을 향상시키고, 그 중 크롬, 니켈 또는 코발트는 다이아몬드가 청동합금계결합재로부터 이탈되지 않도록 하는 것과 함께, 폴리머 혹은 수지형 화합물이 부착되어 있는 실리콘와이퍼의 절삭가공시 수지형화합물과 반응을 일으키지 않아 정밀도가 우수한 가공면을 달성할 수 있도록 한다.In the present invention, diamond, chromium, nickel, cobalt added to the bronze alloy is dissolved or precipitated in the bronze alloy to improve the mechanical properties of the bronze alloy-based binder, wherein chromium, nickel or cobalt is diamond from the bronze alloy-based binder In addition, it is possible to achieve a processing surface with high precision by not causing any reaction with the resin-type compound during cutting of the silicon wiper to which the polymer or resin-type compound is attached.
본 발명은 물성이 서로 다른 이종금속과의 접합이 가능하고, 기존의 용융접합(브레이징, 솔더링, Laser방법)과는 달리 접합부의 미세조직이 변할 위험이 적기 때문에 우수한 접합특성을 얻는 고상확산접합법을 제공한다.The present invention is capable of bonding with dissimilar metals having different physical properties, and unlike the conventional melt bonding (brazing, soldering, laser method), there is little risk of changing the microstructure of the joint, so that the solid-state diffusion bonding method is obtained. to provide.
따라서 본 발명에서는 청동합금에 니켈, 크롬 또는 코발트를 첨가하고 여기에 다이아몬드를 첨가하여 제조된 청동합금계결합재를 알루미늄플랜지와 고상접합시킴으로써, 청동합금계결합재와 알루미늄플랜지(shank부)간의 접합계면을 최적조건으로 유지시킬 수 있다.Therefore, in the present invention, by adding nickel, chromium or cobalt to the bronze alloy and diamond addition thereto, the bonding interface between the bronze alloy binder and the aluminum flange (shank part) is solid-bonded to the aluminum flange. It can be kept in optimum condition.
일반적으로, 구리와 주석만을 함유하는 청동합금을 알루미늄플랜지와 접합시키는 경우에는 접합계면의 기계적 특성에 나쁜 영향을 미칠 수 있는 금속간 화합물(CuAl Cu2Al Cu9Al4 등)이 생성된다는 보고가 있고, 이들은 접합 중에 발생하기 때문에 금속간화합물의 존재를 최소화하기 위해서는 용융접합법(솔더링, 브레이징, Laser법)보다는 고상확산접합법이 유리하다. 이러한 고상확산접합법은 두 모재의 융점이하에서 작업을 실시되므로 냉각과정 중 발생할 수 있는 응고조직의 변화 및 중간생성물의 생성을 최소화하고 서로 다른 이종금속의 열팽창계수로 인한 접합계면의 파괴를 최소화할 수 있기 때문이다.In general, when a bronze alloy containing only copper and tin is bonded to an aluminum flange, it has been reported that intermetallic compounds (such as CuAl Cu 2 Al Cu 9 Al 4) are produced, which may adversely affect the mechanical properties of the bonding interface. In order to minimize the presence of intermetallic compounds, solid phase diffusion bonding is advantageous over melt bonding (soldering, brazing, and laser). Since the solid phase diffusion bonding is performed under the melting point of the two base materials, it is possible to minimize the change of coagulation structure and the formation of intermediate products that may occur during the cooling process and to minimize the breakage of the bonding interface due to the thermal expansion coefficients of different dissimilar metals. Because there is.
이하 첨부된 도면에 의거 본 발명의 실시예를 설명한다.Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
첨부도면 중 도 1은 본 발명에서 얻어진 접합시간 및 온도와 반응층 두께와의 관계를 나타내었다. 이 그래프에서 보는 바와 같이 접합온도를 560℃ 온도에서 20분간 접합했을 때 접합계면은 완전히 형성되어 있었으나 접합계면에는 16㎛두께의 반응층이 관찰되었고 접합시간의 증가와 더불어 60분간 접합했을 때 반응층의 두께는 59㎛로 증가하였다.1 of the accompanying drawings shows the relationship between the bonding time and temperature obtained in the present invention and the thickness of the reaction layer. As shown in this graph, the bonding interface was completely formed when the bonding temperature was bonded at 560 ℃ for 20 minutes, but the reaction layer of 16 µm thickness was observed on the bonding interface. The thickness of was increased to 59 μm.
접합온도가 500℃에서 20분동안 실시한 경우는 반응층의 두께는 매우 좁았으나 접합계면이 완전히 형성되지 못하고 국부적으로 미접합부위 및 균열이 발견되었다.When the bonding temperature was carried out at 500 ° C. for 20 minutes, the thickness of the reaction layer was very narrow, but the joint interface was not completely formed and local unbonded sites and cracks were found.
첨부도면 중 도 2는 560℃에서 20분동안, 니켈, 크롬 또는 코발트를 첨가한 청동합금계결합재와 알루미늄플랜지를 확산접합하여 생성된 반응층의 두께를 나타낸 그래프이다.Figure 2 of the accompanying drawings is a graph showing the thickness of the reaction layer formed by diffusion bonding the aluminum alloy and the bronze alloy-based binder with nickel, chromium or cobalt added for 20 minutes at 560 ℃.
상기 그래프에서는 니켈, 크롬 또는 코발트의 첨가량이 증가할수록 접합계면에서 발생하는 반응층의 두께는 극히 얇게 형성된다는 것을 알 수 있다. 이것은 청동합금내에서 니켈, 크롬 또는 코발트 원소, 및 다이아몬드가 원자의 확산이동을 부분적으로 방해하고 있기 때문이다.In the graph, it can be seen that as the addition amount of nickel, chromium or cobalt increases, the thickness of the reaction layer generated at the junction interface is extremely thin. This is because nickel, chromium or cobalt elements, and diamond, in the bronze alloy partially obstruct the diffusion movement of atoms.
첨부도면 중 도 3은 본 발명에 따르는 청동합금계결합재와 알루미늄플랜지의 접합계면에서의 경도값 분포를 나타내는 그래프이다.3 is a graph showing the distribution of hardness values at the bonding interface between the bronze alloy-based binder and the aluminum flange according to the present invention.
상기 그래프에서 보는 바와 같이, 니켈, 크롬 또는 코발트가 첨가된 경우의 접합계면에서의 경도값이 첨가원소가 첨가되지 않은 시편에 비해 높게 나타났으며, 또한 니켈 또는 코발트첨가의 청동합금계결합재는 고용강화효과로 인하여, 석출효과가 나타나는 크롬첨가의 청동합금계결합재에서의 경도값보다는 다소 낮게 나타났다.As shown in the graph, the hardness value at the junction interface when nickel, chromium, or cobalt was added was higher than that of the specimen without the addition element, and the bronze alloy binder containing nickel or cobalt was dissolved. Due to the reinforcing effect, it was slightly lower than the hardness value of the chromium-added bronze alloy binder.
본 발명에서, 청동합금에 첨가된 다이아몬드 및 크롬, 니켈 또는 코발트는 청동합금에 고용 혹은 석출되어 다이아몬드휠의 기계적 특성을 향상시키고, 그 중 크롬, 니켈 또는 코발트는 다이아몬드가 청동합금계결합재로부터 이탈되지 않도록 하는 장점이 있다.In the present invention, the diamond and chromium, nickel or cobalt added to the bronze alloy is dissolved or precipitated in the bronze alloy to improve the mechanical properties of the diamond wheel, among which chromium, nickel or cobalt is the diamond is not separated from the bronze alloy binder There is an advantage to avoid.
또한 청동합금계결합재 중의 크롬, 니켈 또는 코발트원소는 폴리머 혹은 수지형 화합물이 부착되어 있는 실리콘와이퍼의 절삭가공시 수지형화합물과 반응을 일으키지 않아 정밀도가 우수한 가공면을 달성할 수 있다.In addition, chromium, nickel or cobalt elements in the bronze alloy-based binder do not react with the resin compound during cutting of the silicon wiper to which the polymer or the resin compound is attached, thereby achieving a highly precise machining surface.
또한 본 발명은 접합강도 및 신뢰도가 높은 접합체를 개발하고 접합체내에 발생되는 잔류응력의 크기를 최소화하며, 작업공정을 간략하게 하는 접합부의 설계기술 개발에 적당하며 접합부의 신뢰성이 확보되는 고상확산접합법을 제공하여 물성이 서로 다른 이종금속과의 접합이 가능해지고, 기존의 용융접합(브레이징, 솔더링, Laser방법)과는 달리 접합부의 미세조직이 변할 위험이 적기 때문에 우수한 접합특성을 얻게 된 효과가 있다.In addition, the present invention is to develop a joint with high joint strength and reliability, minimize the amount of residual stress generated in the joint, and is suitable for the development of the design technology of the joint to simplify the work process, solid phase diffusion bonding method that ensures the reliability of the joint It is possible to bond with dissimilar metals having different physical properties, and unlike conventional melt bonding (brazing, soldering, and laser methods), there is little risk of changing the microstructure of the joint, and thus excellent bonding characteristics are obtained.
이러한 효과는 본 발명으로 하여금 청동합금에 니켈, 크롬 또는 코발트를 첨가하고 여기에 다이아몬드를 첨가하여 제조된 청동합금계결합재를 알루미늄플랜지와 고상접합시킴으로써 청동합금계결합재와 알루미늄플랜지(shank부)간의 접합계면을 최적의 상태로 유지할 수 있는 부수효과도 얻는다.This effect allows the present invention to join the bronze alloy-based binder and the aluminum flange (shank part) by adding a bronze alloy-based binder prepared by adding nickel, chromium or cobalt to the bronze alloy and diamond addition thereto to the aluminum flange and the solid phase. A side effect of maintaining the interface in an optimal state is also obtained.
일반적으로 청동합금이 알루미늄플랜지와 접합되면 접합계면에 기계적 특성에 나쁜 영향을 미치는 금속간 화합물(CuAl Cu2Al Cu9Al4 등)이 생성되는 일이 접합중에 발생하므로, 이를 최소화하기 위하여 용융접합법(솔더링, 브레이징, Laser법)보다는 고상확산접합법이 바람직하며, 이는 두 모재의 융접이하에서 작업을 실시되므로 냉각과정중 발생할 수 있는 응고조직의 변화 및 중간생성물의 생성을 최소화하고 서로 다른 이종금속의 열팽창계수로 인한 접합계면의 파괴를 최소화할 수 있기 때문이다.In general, when a bronze alloy is bonded to an aluminum flange, intermetallic compounds (CuAl Cu2Al Cu9Al4, etc.) are generated during bonding, which adversely affects mechanical properties. The solid phase diffusion bonding method is preferable to the laser method, which is performed under the fusion of the two base materials, thereby minimizing the change of solidification structure and the formation of intermediate products that may occur during the cooling process, and the joining due to the thermal expansion coefficients of different dissimilar metals. This is because the destruction of the interface can be minimized.
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