Limestone
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Composit Mineral Fiber

Trade name : N.A.F.

N.A.F. comes from China. As the traditional steeel fiber type friction material (i.e.semi-metallic friction material) exists some weekness known, for example, high gravity, high hardness, high heet-conductivity, trending to rust, abrading to brake couple (disc or drum), higher cost of steel fiber etc.

Since 1990's people started to research and develop "Non-Asbestos, non-metallic type friction material" in many contries.

This N.A.F. has been successfully researched and developed in 1997. After testing an using in over thirty factories, the product has normally been applied in manu friction material manufacturing enterprises, and has exported to over sea markete. It is used to manufacture the non-asbestos disc pad and brake lining of automobiles, engineering machines and trains.

Characteristics

1.The entire mineral fibers included N.A.F. are the mineral fiberes that are extensively applied in industrial fields without public harm.

2.Appearande: yellow-white color with soft sense.

3.It can be used in friction material as the primary ingredient of fiber reinforcement. The reinforcing effect of it can meet the demand of mechanic strength of friction material products.

4.It can meet the demand of friction characteristics of friction materials.

5.Excellent heat-resistance.

6.Suitable price, obviously cheaper than that of steel fiber.

 

Technical specification

1.Loss of ignition (800deg,1hr) under 10%

2.Buld density: 0.13-0.20 g/cm3

3.Water content: under 3%

4.Chemical ingredient

SiO2 40.0-43.0%
Al2O3 16.0-18.0%
CaO 14.0-16.0%
MgO 5.0-7.0%
Fe2O3 3.0-5.0%
C 4.0-6.0%

5.Reference technical target

fiber diameter 0-20micron

fiber length 0-20mm

 

The main ingredients of N.A.F. are the mixture of non-metallic mineral with high melt point.The fiber is made by the process of melting at high temparature over 1000deg. and then fiber-forming by the methods of spraying or centrifugating, so it's heat-resistance is better than asbestos. It has good heat-stability during the range of work temperature of brake lining (200-400deg.), so it can help to reduce the degree of fade.

N.A.F. has low heat-conductivity coefficient, can avoid over-heat of brake liquid.

 

Applied Example and test results.

Drum brake lining for light and medium truck.

1.Formula

Ingredient
Ratio%
N.A.F.
20-30
Other fiber
2-8
Rubber-modified resin
15-21
Friction adjust agent
20-40
Reducing friction filler
10-15

2.Test Results

Friction Character (D-MS Friction test machine)

Fiber Type
N.A.F.Type Brake Lining
Asbestos Type Brake Lining
Rise
Decrease
Rise
Decrease
Friction coefficent 100 deg
0.44
0.37
0.37
0.35
150
0.41
0.40
0.38
0.37
200
0.41
0.42
0.42
0.38
250
0.37
0.37
0.38
0.39
300
0.38
0.38
Rate of Wear 10exp-7cm3/N.m 100 deg
0.11
0.12
150
0.16
0.11
200
0.12
0.12
250
0.38
0.26
300
0.41
0.53

Test Result of Physics Property

Item
N.A.F.Type Brake Lining
Asbestos Type Brake Lining
Impact Strength dj/cm2
3.9
4.3
HRM
65
82.7
Flexing Strength N/mm2
50.28
52.6
Maximum Strain 10exp-5mm/mm
8.4
7.6
Density g/cm3
2.16
2.14

 

Brake Lining for City Public Traffic Vehicle

1.Formula

Ingredient
Ratio%
N.A.F.
20-40
Other fiber
0-20
Rubber
5-15
Resin
5-12
Filler and Others
35-45

2.Test Result

Friction Character (D-MS Friction test machine)

Temparature (deg)
100
150
200
250
300
Friction coefficent
0.32
0.36
0.40
0.39
0.36
Rate of Wear
0.14
0.16
0.18
0.25
0.30

Physics Character

Impact Strength dj/cm2
5.5
HRM
55
Density g/cm3
2.18

 

Disc Pad for Car

1.Formula

Ingredient
Ratio%
N.A.F.
10-22
Steel Wool
0-10
Rubber
0-3
Resin
10-15
Filler and Others
50-65

2.Test results

Friction Character (D-MS Friction test machine)

Temparature (deg)
100
150
200
250
300
350
Friction coefficent
0.36
0.40
0.43
0.41
0.33
0.31
Rate of Wear
0.18
0.25
0.41
0.39
0.51
0.64

Physics Character

HRM
72
Density g/cm3
2.2-2.3