The Effect of Compression Load, Sintering Temperature and Sintering Time During Production the of...

7/31/2019 The Effect of Compression Load, Sintering Temperature and Sintering Time During Production the of Aluminum Based Metal Matrix Composites

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The Effect of Compression Load, Sintering Temperature and Sintering Time

during Production the of Aluminum Based Metal Matrix Composites

Raghunath.K1, Rajkumar.D

2, Pon swarna raja pandian.S

3, Rajesh.S

4

1, 2, 3: Final Year Mechanical Engineering, Kalasalingam University, Krishnankoil.

4: Assistant Professor, Mechanical Engineering, Kalasalingam University, Krishnankoil.

Contact No 1, 2,3: 9486123764,9486225660, 9566780890.

Email:[email protected],[email protected]

2

Abstract

In this paper attempt has been taken to fabricate aluminum based Metal Matrix Composites

(MMC) using tungsten carbide as reinforcement material and aluminum as matrix material.

During the fabrication the effect of load, sintering temperature and sintering time were analyzed.

The result reveled that increases in load, temperature and time increase the mechanical

properties of the material to the certain level. Increases in reinforcement content beyond 15%

decreases the mechanical properties of materials.

Keywords: Metal matrix composite, Aluminium, Tungsten carbide, Load, sintering

temperature and time.

Introduction

Metal matrix composites offer a number of

advantages compared to their base metals,

such as higher specific strengths and moduli,

higher elevated temperature resistance,

lower coefficients of thermal expansion,

and, in some cases, better wear resistance.

On the down side, they are more expensive

than their base metals and have lower

toughness. Metal matrix composites also

have some advantages compared to polymer

matrix composites, including higher matrix

dependent strength and moduli, higher

elevated temperature resistance, no moisture

absorption, higher electrical and thermal

conductivities, and non- flammability.

However, metal matrix composites (MMCs)

are normally more expensive than even

polymer matrix composites, and the

fabrication processes are much more limited,

especially for complex structural shapes.

Due to their high cost, commercial
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than starting with elemental blends. In

Metal matrix composite, the method of the

introduction of particles into the matrix melt

is one of the most important aspects in

composition. The commercially different

sizes of reinforcement materials are

available. In this work the average particle

of the reinforcement material is 13 to 20

microns. The aluminum powder average

particle size is 300 microns. The materials

are blended uniformly and pressed at

different loads to fabricate specimen. The

size of the specimen is 30 mm and height

may vary from 4 to 30mm. Three different

loads were applied to produce specimen,

namely 200, 250 and 300 kN. The

temperature in the furnace is varied from

500,550 and 6000C. The time in the furnace

is varied from 30 to 60 min. Three different

percentages of reinforcements were used for

fabrication and it is listed in the table 1.

Table 1

Composition Load 200KN Load 250KN Load 300KN

Weight (gm) Weight (gm) Weight (gm)

95% AL 5% WL 7 10 7 10 7 10

90% AL 10% WL 7 10 7 10 7 10

85% AL 15% WL 7 10 7 10 7 10

80%AL 20%WL 7 10 7 10 7 10

SAMPLE PREPARATION:

All samples must also be of an appropriate

size to fit in the specimen chamber and are

generally and are generally mounted rigidly

on a specimen stub. Several models of SEM

can examine any part of a 6-inch (15 cm)

semiconductor wafer, and some can tilt anobject of that size to 450. The fig I show the

sample specimen of the 5% reinforcement

composites.


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Fig 1: 5% reinforcement composites

Result and Discussion

The hardness was conducted on the

specimen and it was found that the increases

in reinforcement will increases the hardness

of the material. The table 1 shows the

Rockwell hardness value for the different

specimen.

Rockwell hardness is conducted on

composite pellets. Composition of greater

percentage (i.e. 15% composition) shows the

better result. Therefore 15% composition

can be selected for fabrication of any

automobile component.

Table 1: Hardness

Pellets Hardness(c scale)

5% 47

10% 51

15% 53


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