JPH01320328A - Friction-use plate - Google Patents

Abstract

PURPOSE:To enhance wear resistance inexpensively by forming a friction-use plate with a fabric composite material consisting of carbon fiber with a fiber diameter less than 10mum and tensile strength not less than 200kg/mm<2> and carbon fiber with a fiber diameter 10mum or more. CONSTITUTION:A carbon fiber reinforced carbon compound material (thereinafter, C/C composite) is prepared by a fabric consisting of carbon fiber with a fiber diameter less than 10mum further with tensile strength 200kg/mm<2> or more and carbon fiber with a fiber diameter 10mum or more, and a friction-use plate 1 is formed by this C/C composite. The C/C composite, thus prepared, obtains excellent mechanical strength by using the carbon fiber with a fiber diameter less than 10mum and tensile strength 200kg/mm<2> or more and excellent wear resistance by using the very inexpensive carbon fiber with a fiber diameter 10mum or more.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a friction plate, particularly a friction plate for brakes of aircraft, railways, automobiles, industrial machines, etc., made of carbon fiber reinforced carbon composite material. It is related to the board.

``Prior art'' Brakes that use carbon fiber-reinforced carbon composite materials (hereinafter abbreviated as C/C composite) for friction plates are used in aircraft, etc., and have a lower brake value than conventional friction plates that use metal materials. This results in lighter weight and improved performance.

The friction of the four composite materials exhibits a stable and high coefficient of friction even at very high sliding speeds, and has the advantage that fluctuations in the coefficient of friction due to temperature are small.

Furthermore, since the % composite has excellent heat resistance and thermal conductivity, it can be used even under conditions that generate large amounts of frictional heat.

Furthermore, the C4 composite has excellent mechanical strength and can be used as a friction plate by itself without using a reinforcing plate (for example, a metal material).

``Problems to be solved by the invention'' Although % composites exhibit excellent friction performance, they have the disadvantage of poor wear resistance. % composites used in aircraft friction plates are said to have superior wear resistance compared to metal friction plates; Yes, especially at low temperatures
At around 00°C, the wear of the % composite was large, and the wear of the sheen composite using carbon fibers with a fiber diameter of less than 10 μm was particularly large.

Therefore, if carbon fibers with a fiber diameter of 10 μm or more are used, the wear resistance problem can be alleviated to some extent. However, fiber diameter 10
More than μm and tensile strength 200K9/1m? Since the above carbon fibers are very expensive, this carbon fiber is expensive and can only be used for friction plates in limited fields, and if carbon fibers with a tensile strength of less than 200Kg□2 are used, the percentage of composite Mechanical strength is not sufficient for use as a friction plate.

In view of the above, the present invention has been developed to solve these problems.

"Means for Solving the Problem" That is, the friction plate made of carbon fiber-reinforced carbon composite material of the present invention comprises carbon fibers having a fiber diameter of less than 10 μm and a tensile strength of 200 Kq72 or more, and carbon fibers having a fiber diameter of 10 μm or more. It is characterized by using a woven fabric.

The present invention will be explained in detail below using Examples.

The present invention provides a friction plate made of a carbon fiber-reinforced carbon composite material as illustrated in Fig. 1.2, in which carbon fibers having a fiber diameter of less than 10 μm and a tensile strength of 200 Kq/w+2 or more and a fiber diameter of 10 μm are used. A % composite is manufactured using the above carbon fiber fabric.

However, the proportion of carbon fibers having a fiber diameter of 10 μm or more in this woven fabric is preferably 10 to 85 wt%.

"Function" The composite produced as described above has excellent mechanical strength by using carbon fibers with a fiber diameter of less than 10/Jm and a tensile strength of 200 Kg/ltm2 or more, and has a fiber diameter of 10 μm. By using the above-mentioned extremely inexpensive carbon fibers, excellent wear resistance can be achieved.

In addition, the mixing ratio of these fibers is determined by the wear resistance and mechanical strength of the composite. For example, if carbon fibers with a fiber diameter of 10 μm or more are less than 10 wt%, the effect of improving the wear resistance of the composite is not significant, and if it exceeds 85 wt%. Otherwise, the mechanical strength is not sufficient for use as a friction plate.

Furthermore, since carbon fiber fabric is used, it has excellent mechanical properties and reliability.

"Example" Examples of the present invention will be described below.

Example 1 Carbon fibers A and B were woven in the proportions shown in Table 1, and a composite was produced using this woven fabric.

The carbon fiber content of each C4 composite was approximately 50 wt%.
I made it so that

The apparent specific gravity and bending strength of these six types of composites were determined as follows.
Shown in the table.

Carbon fiber A has a fiber diameter of 7 μm and a tensile strength of 6.04 GP.
a, the tensile modulus is 225 GPa, and carbon fiber B has a fiber diameter of 14.5 μm, a tensile strength of 725 MPa, and a tensile modulus of 29 GPa.

Example 2 Of the % composites prepared in Example 1, samples ■, ■, ■, ■ shown in Table 1 were processed into a rough shape with a pad of a spot type disc brake for an automobile, and a wear test was conducted.

The wear test used an inertia braking method with an inertia load of 5.0Kg'.
m'5eC2, disc rotor rotation 50 Or,
p.m.

After rotating with
.

I braked until it was. The disc rotor dimensions are 24
5 breath x t18fflI111 The friction area of the pad is 45d
And so.

At that time, the pressing force of the pad was constant at 10Kg/cn, and a thermocouple was embedded inside the rotor so that the rotor temperature was 100Kg/cn.
Braking now starts when the temperature is below ℃. Table 3 shows 100
The amount of wear of the % composite pad after 0 braking is shown.

Table 2 Table 3 "Effects of the Invention" The friction plate of the present invention as described above is cheaper and has better wear resistance than the conventional sicomposite friction plate, and has better heat resistance and lighter weight than the conventional friction plate. % Composite as well as good.

Since the friction plate of the present invention is inexpensive, it can be used in a wider range of applications than conventional products, and specifically, it can be used in brakes for aircraft, railways, automobiles, etc.

[Brief explanation of the drawing]

1 and 2 both illustrate perspective views of friction plates according to the invention. (1)...Friction plate＜'＜:''1 Agent Patent attorney Masashi Yoshitake ：、：＋、'、
：・“Soup 1 Figure 2

Claims (1)

[Claims] (1) Fiber diameter less than 10μm and tensile strength 200Kg/
A friction plate made of a carbon fiber-reinforced carbon composite material, characterized by using carbon fibers having a strength of 10 μm or more and a carbon fiber fabric having a fiber diameter of 10 μm or more.