KR100256758B1 - Aluminum alloy for automobile brake system - Google Patents

Aluminum alloy for automobile brake system Download PDF

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Publication number
KR100256758B1
KR100256758B1 KR1019950035216A KR19950035216A KR100256758B1 KR 100256758 B1 KR100256758 B1 KR 100256758B1 KR 1019950035216 A KR1019950035216 A KR 1019950035216A KR 19950035216 A KR19950035216 A KR 19950035216A KR 100256758 B1 KR100256758 B1 KR 100256758B1
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aluminum alloy
alloy composition
weight
present
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KR1019950035216A
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KR970021344A (en
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한도석
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정몽규
현대자동차주식회사
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
    • C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
    • C22C32/0036—Matrix based on Al, Mg, Be or alloys thereof
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0084—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ carbon or graphite as the main non-metallic constituent

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Braking Arrangements (AREA)

Abstract

PURPOSE: An aluminum alloy composition for a brake system of automobile is provided, which has superior abrasion resistance and strength, and can be applied to a component for gravity casting due to superior fluidity. CONSTITUTION: The aluminum alloy composition comprises 9.5 to 10.5 wt.% of Si, 0.2 wt.% or less of Cu, 0.75 to 1.2 wt.% of Mg, 0.03 wt.% or less of Mn, 0.3 wt.% or less of Fe, 0.03 wt.% or less of Zn, 0.2 wt.% or less of Ti, 15.0 to 25.0 wt.% of SiC and 62.54 to 74.75 wt.% of Al, wherein a particle diameter of the silicon carbide is 7 to 13 microns, the aluminum alloy composition further comprises 0.001 wt.% or less of SiO2, 0.0006 wt.% or less of free silicon and 0.0004 wt.% or less of free carbon.

Description

[발명의 명칭][Name of invention]

자동차 제동장치용 알루미늄합금 조성물Aluminum Alloy Composition for Automobile Braking System

[발명의 상세한 설명]Detailed description of the invention

[산업상 이용분야][Industrial use]

본 발명은 알루미늄합금에 관한 것으로서, 더욱 상세하게는 자동차의 제동장치인 브레이크 드럼 또는브레이크 디스크에 사용되는 알루미늄합금 조성물에 관한 기술이다.The present invention relates to an aluminum alloy, and more particularly, to an aluminum alloy composition for use in brake drums or brake discs, which are brake devices for automobiles.

[종래기술][Private Technology]

일반적으로 자동차의 제동장치인 브레이크는 마찰력을 이용하여 자동차가 가지는 운동에너지를 열에너지로 바꾸고 이들 대기속으로 방출시켜 제동작용을 하는 장치로서, 이와 같은 제동장치의 주 구성요소인 브레이크드럼 및 브레이크 디스크는, 첫째 정적 동적 평형이 잘 잡혀야하며, 둘째 브레이크가 확장되었을 때 변형되지 않을 만큼 충분한 강성을 갖고 있어야 하며, 세째 마찰에 대한 충분한 내마모성을 갖고 있어야 하며, 네째 방열이 잘 되어야 하며, 다섯째 가벼워야 한다는 요건을 구비하여야만 한다. 즉 브레이크 드럼 및 브레이크 디스크의 재료가 갖추어야 할 물성은 우수한 마찰성능, 내마모성, 내열성 및 방열성으로 이중 마찰 특성은 가능한 한 높은 마찰계수를 얻을 수 있는 것이 바람직하다. 또 브레이크의 드럼 표면은 때로 600-700℃에 달하기 때문에 고온강도, 피로강도 등고 커야하며, 브레이크 사용중 가열에 의한 팽창과 냉각에 의한 수축을 반복하기 때문에 열균열이 일어나기 쉬워 우수한 내말멸성 및 내열성이 요구되며, 열용량이 충분하지 않을 경우에는 고속에서 페이드를 일으키고, 방열성이 좋지 않으면 긴언덕길이나 브레이드의 반복사용에 의해서도 페이드를 현상이 일어나기 쉬워 우수한 방열성 또한 요구된다.In general, a brake of a vehicle, a brake, is a device that converts kinetic energy of a vehicle into thermal energy and releases it into the atmosphere by using a friction force. First, the static dynamic equilibrium must be well balanced, the second must have sufficient rigidity not to deform when the brake is extended, the third must have sufficient abrasion resistance against friction, the fourth must be well radiated, and the fifth must be light. Must be provided. In other words, the physical properties of the brake drum and the brake disc are excellent in friction performance, wear resistance, heat resistance, and heat dissipation, so that the double friction characteristics are desirable to obtain a coefficient of friction as high as possible. In addition, since the brake drum surface sometimes reaches 600-700 ℃, the high temperature strength, fatigue strength, etc. must be large, and since the expansion and contraction by heating are repeated during the use of the brake, thermal cracking is likely to occur, resulting in excellent abrasion resistance and heat resistance. If the heat capacity is not sufficient, it causes a fade at high speed, and if the heat dissipation is not good, the fade is easily generated even by repeated use of long hill roads or braids, and excellent heat dissipation is also required.

이와 같은 요건을 갖추어야 하는 브레이크 드럼 및 브레이크 디스크의 소재로서 종래부터 사용되어 오고 있는 것으로는 특수 주철, 강판, 알루미늄합금 등이 있다. 이 중 널리 사용되고 있는 소재는 알루미늄합금으로 실리콘을 포함하고 있는 하기 조성을 갖는 Al-Si합금이다.As materials for brake drums and brake discs that must meet these requirements, special cast iron, steel sheets, aluminum alloys, and the like have been conventionally used. Among them, a widely used material is an aluminum alloy Al-Si alloy having the following composition containing silicon.

그러나 상기한 자동차 제동장치용 합금을 사용하여 브레이크 드럼 및 디스크를 제작하였을 경우 브레이크 드럼 및 디스크의 인장강도, 항복강도가 낮고, 탄성계수, 마찰계수 등의 물성도 나쁘며 내마모성도 매우 낮다는 문제점이 있다.However, when the brake drum and the disc are manufactured using the above-described alloy for automobile braking device, there is a problem that the tensile strength and yield strength of the brake drum and the disc are low, the physical properties such as elastic modulus and friction coefficient are bad and the abrasion resistance is very low. .

[발명이 해결하려 하는 과제][Problems to Solve Invention]

본 발명은 상기와 같은 종래기술의 문제점을 해결하기 위하여 안출된 것으로서, 본 발명의 목적은 첫째 내마모성 및 강도가 우수한 자동차 제동장치용 알루미늄합금을 제공하고, 둘째 유동성이 우수하여 중력주조용 부품에 적용 가능한 자동차 제동장치용 알루미늄합금을 제공하는데 그 목적이 있다.The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to provide an aluminum alloy for automobile braking device excellent in first wear resistance and strength, and secondly applied to gravity casting parts excellent in fluidity It is an object of the present invention to provide aluminum alloys for automotive braking systems.

[과제를 해결하기 위한 수단][Means for solving the problem]

상기와 같은 본 발명의 목적을 달성하기 위하여 본 발명은 자동차 제동장치용 알루미늄합금 조성물에 있어서, 실리콘 카바이드(SiC)를 더욱 포함하는 자동차 제동장치용 알루미늄합금 조성물을 제공한다.In order to achieve the object of the present invention as described above, the present invention provides an aluminum alloy composition for automobile braking device further comprising silicon carbide (SiC) in the aluminum alloy composition for automobile braking device.

또한 본 발명은 하기한 조성으로 이루어진 알루미늄합금 조성물을 제공한다.The present invention also provides an aluminum alloy composition consisting of the following composition.

[작용][Action]

이하 본 발명을 더욱 상세하게 설명한다. 상기한 바와 같이 본 발명은 자동차 제동장치용 알루미늄합금 조성물에 있어서, 실리콘 카바이드(SiC)를 더욱 포함하는 자동차 제동장치용 알루미늄합금 조성물을 제공한다. 이와 같이 실리콘 카바이드 세라믹 입자를 첨가하므로써 내마모성 및 강도가 강화된 복합재료를 얻을 수 있다. 본 발명에 있어서, 상기한 실리콘 카바이드의 양은 전체 알루미늄합금 조성물에 대하여 15-25중량％, 더욱 바람직하게는 19-20중량％인 것이 바람직하다.Hereinafter, the present invention will be described in more detail. As described above, the present invention provides an aluminum alloy composition for automobile braking apparatus, further comprising silicon carbide (SiC) in the aluminum alloy composition for automobile braking apparatus. By adding the silicon carbide ceramic particles in this way, a composite material having enhanced wear resistance and strength can be obtained. In the present invention, the amount of silicon carbide described above is preferably 15-25% by weight, more preferably 19-20% by weight based on the total aluminum alloy composition.

상기한 실리콘 카바이드의 양이 알루미늄합금 조성물에 대하여 15중량％미만이면 내마모성 향상 효과가 미미하며, 25중량％를 초과하면 취성이 약해지는 문제점이 발생하게 된다. 또 본 발명에 있어서, 상기한 실리콘 카바이드의 입자직경은 7-13㎛인 것이 바람직하다. 상기한 실리콘 카바이드의 입자직경이 7㎛ 미만이면 내마모성 향상의 효과가 없으며, 13㎛를 초과하면 균일한 조성의 합금을 얻을 수 없게 된다.If the amount of the silicon carbide is less than 15% by weight with respect to the aluminum alloy composition, the effect of improving the wear resistance is insignificant, and when the amount of the silicon carbide exceeds 25% by weight, the problem of weakening of brittleness occurs. Moreover, in this invention, it is preferable that the particle diameter of said silicon carbide is 7-13 micrometers. If the particle diameter of the silicon carbide is less than 7 μm, there is no effect of improving wear resistance, and if it exceeds 13 μm, an alloy of a uniform composition cannot be obtained.

또한 상기한 본 발명은 SiO2, 유리 실리콘(Free Si), 유리 탄소(Free C)로 이루어진 군에서 선택되는 하나 이상의 물질을 더욱 포함하는 것이 바람직하며 이때 상기한 알루미늄합금에 대하여 상기한 SiO2는 0.001 중량％이하, 유리 Si는 0.0006중량 ％이하, 유리 탄소는 0.0004 중량％이하인 것이 바람직하다. 이들 SiO2유리실리콘, 유리탄소의 첨가에 따라 알루미늄의 첨가량이 가감된다. 상기한 바와 같이 SiO2를 더욱 첨가하면 경도가 증가되는 장점이있으나 SiO2의 첨가량이 0.001중량％를 초과하면 합금의 취성이 약해지는 문제점이 있게 된다. 또한 본 발명은 Si 9.5-10.5중량％, Cu 0.2 중량％ 이하, Mg 0.75-1.2중량％, Mn 0.03중량％ 이하, Fe 0.3중량％ 이하, Zn 0.03중량％ 이하, Ti 0.2 중량％ 이하, SiC 15.0-25.0중량％, Al 74.75-62.54중량％로 이루어진 알루미늄합금 조성물을 제공한다.In addition, the present invention preferably further comprises at least one material selected from the group consisting of SiO 2 , free silicon (Free Si), free carbon (Free C), wherein the SiO 2 described above for the aluminum alloy It is preferable that 0.001 weight% or less, glass Si is 0.0006 weight% or less, and free carbon is 0.0004 weight% or less. The added amount of aluminum is in accordance with the modification of these SiO 2 addition of the free silicone, glass carbon. As described above, the addition of SiO 2 has the advantage of increasing the hardness, but when the amount of SiO 2 added exceeds 0.001% by weight, there is a problem that the brittleness of the alloy is weakened. In addition, the present invention is Si 9.5-10.5% by weight, Cu 0.2% by weight or less, Mg 0.75-1.2% by weight, Mn 0.03% by weight or less, Fe 0.3% by weight or less, Zn 0.03% by weight or less, Ti 0.2% by weight or less, SiC 15.0 It provides an aluminum alloy composition consisting of -25.0 wt%, Al 74.75-62.54 wt%.

상기한 본 발명에 있어서, 상기한 실리콘 카바이드의 양은 상기한 알루미늄 합금 조성물에 대하여 19-20 중량％인 것이 더욱 바람직하며, 상기한 실리콘 카바이드의 입자직경은 7-13㎛인 것이 바람직하다.In the present invention described above, the amount of the silicon carbide is more preferably 19-20% by weight based on the aluminum alloy composition, and the particle diameter of the silicon carbide is preferably 7-13 µm.

또한 상기한 본 발명은 SiO2, 유리 실리콘(Free Si), 유리 탄소(Free C)로 이루어진 군에서 선택되는 하나 이상의 물질을 더욱 포함하는 것이 바람직하며 이때 상기한 알루미늄합금에 대하여 상기한 SiO2는 0.001 중량％이하, 유리 Si는 0.0006 중량％이하, 유리탄소는 0.0004 중량％ 이하인 것이 바람직하다.In addition, the present invention preferably further comprises at least one material selected from the group consisting of SiO 2 , free silicon (Free Si), free carbon (Free C), wherein the SiO 2 described above for the aluminum alloy It is preferable that 0.001 weight% or less, glass Si is 0.0006 weight% or less, and free carbon is 0.0004 weight% or less.

또한 상기한 본 발명의 알루미늄합금은 유동성이 우수하여 중력주조방법에 의하여 부품을 제작하기 쉽다.In addition, the aluminum alloy of the present invention is excellent in fluidity, it is easy to manufacture parts by the gravity casting method.

[실시예 ]EXAMPLE

이하 본 발명의 바람직한 실시예 및 비교예를 기재한다. 그러나 하기한 실시예는 본 발명의 구성을 설명하고 본 발명의 효과를 입증하기 위한 본 발명의 일실시예일 뿐 본 발명이 하기한 실시예에 한정되는 것은 아니다.Hereinafter, preferred examples and comparative examples of the present invention are described. However, the following examples are only examples of the present invention for explaining the structure of the present invention and to demonstrate the effects of the present invention, and the present invention is not limited to the following examples.

[실시예 1]Example 1

하기한 조성을 갖는 합금을 통상의 알루미늄 합금의 제조 공정에 따라 제조 하였다.Alloys having the following compositions were prepared according to the general aluminum alloy production process.

[비교예][Comparative Example]

하기한 조성을 갖는 합금을 통상의 방법에 의하여 제조 하였다.Alloys having the following compositions were prepared by conventional methods.

상기한 실시예와 비교예에 의하여 제조된 합금을 통상의 실험적 방법으로 인장 강도, 항복 강도, 탄성 계수, 마찰 계수, 및 마모량을 측정하여 다음의 표에 나타내었다.The alloys prepared by the above examples and comparative examples were measured in tensile strength, yield strength, modulus of elasticity, coefficient of friction, and abrasion by conventional experimental methods, and are shown in the following table.

[표 1]TABLE 1

[효과][effect]

상기한 바와 같이 본 발명의 실시예에 따라 제조된 자동차 프레임용 알루미늄합금은 비교예에 의하여 제조된 알루미늄합금에 비하여 인장강도 28％, 항복강도 70％, 탄성계수 30％가 증가하였으며, 마찰계수는 25％, 마모량은 10배 이상 감소하는 등 그 물성면에서 매우 우수하다.As described above, the aluminum alloy for an automobile frame manufactured according to the embodiment of the present invention has an increase in tensile strength of 28%, yield strength of 70%, and elastic modulus of 30% compared to that of the aluminum alloy prepared according to the comparative example. It is excellent in the physical property, such as 25% and the amount of abrasion decreases by 10 times or more.

따라서 본원 발명에 따라 제조된 알루미늄합금 조성물은 강도, 내마모성등의 물성이 우수하여 자동차 제동장치용 소재로서 유용하게 사용될 수 있다.Therefore, the aluminum alloy composition prepared according to the present invention is excellent in physical properties such as strength and abrasion resistance can be usefully used as a material for automobile braking device.

또한 본 발명은 자동차 제동장치 이외에도 본 발명과 같이 강도, 내마모성등에 있어서 우수한 물성을 요구하는 부품의 소재로서 사용될 수 있다.In addition to the automobile braking device, the present invention can be used as a material for parts that require excellent physical properties in strength, abrasion resistance and the like as the present invention.

Claims (5)

하기 조성으로 이루어진 알루미늄합금 조성물 : Si 9.5~10.5 중량％; Cu 0.2 중량 ％ 이하; Mg 0.75~1.2 중량％; Mn 0.03 중량％ 이하; Fe 0.3 중량％ 이하; Zn 0.03 중량％ 이하; Ti 0.2 중량％ 이하; Sic 15.0~25.0 중량％ 이하; 및 Al 62.54~74.75 중량％.Aluminum alloy composition consisting of the following composition: Si 9.5 ~ 10.5% by weight; 0.2 wt% or less of Cu; Mg 0.75-1.2 wt%; Mn 0.03 wt% or less; 0.3 wt% or less of Fe; Zn 0.03 wt% or less; Ti 0.2 wt% or less; Sic 15.0-25.0 weight% or less; And Al 62.54 to 74.75 weight percent. 제1항에 있어서, 상기한 실리콘 카바이드의 입자직경이 7~13㎛인 알루미늄합금 조성물.The aluminum alloy composition according to claim 1, wherein the silicon carbide has a particle diameter of 7 to 13 µm. 제1항에 있어서, 상기한 알루미늄합금 조성물에 대하여 0.001 중량％ 이하의 SiO2를 더욱 포함하는 알루미늄합금 조성물.The aluminum alloy composition of claim 1, further comprising 0.001% by weight or less of SiO 2 based on the aluminum alloy composition. 제1항에 있어서, 상기한 알루미늄합금 조성물에 대하여 0.0006 중량％ 이하의 유리 실리콘(Si)를 더욱 포함하는 알루미늄합금 조성물.The aluminum alloy composition of claim 1, further comprising 0.0006% by weight or less of free silicon (Si) based on the aluminum alloy composition. 제1항에 있어서, 상기한 알루미늄합금 조성물에 대하여 0.0004 중량％ 이하의 유리 카본(C)을 더욱 포함하는 알루미늄합금 조성물.The aluminum alloy composition of Claim 1 which further contains 0.0004 weight% or less of free carbon (C) with respect to the said aluminum alloy composition.
KR1019950035216A 1995-10-12 1995-10-12 Aluminum alloy for automobile brake system KR100256758B1 (en)

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JPH01191759A (en) * 1988-01-26 1989-08-01 Toyota Motor Corp Aluminum alloy composite material

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JPH01191759A (en) * 1988-01-26 1989-08-01 Toyota Motor Corp Aluminum alloy composite material

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