folio kimia
Post on 08-Apr-2015
341 Views
Preview:
TRANSCRIPT
4. Red clay contains iron (III) oxide which gives the red colour . 5. General uses ceramics are as follows of :
• very hard and strong but brittle
• inert to chemical reaction
• has a very high melting point
• good electric and heat insulator
• able to withstand compression
9.6 COMPOSITE MATERIAL 1.
A composite material is a structural material formed by
combining two or more materials with different physical properties, producing a
complex mixture.
2.
The composite material produced will have different properties
far more superior to the original materials.
3.
The composite material produced are harder, stronger, lighter,
more resistant to heat and corrosion and also for specific purposes.
4.When composite material is formed, the weakness of the components will not exist anymore. Composite material Component Properties of component Properties of composite Reinforced concrete Concrete
Hard but brittle,
With low tensile
strength
Stronger, higher tensile
strength, not so brittle,
does not corrode easily,
can withstand higher
applied forces and loads,
relatively cheaperSteel
Hard with high tensile strength but expensive and can corrode Fibre optics Glass of low refractive index Transparent, does not reflect light rays.
Reflect light rays and
allow light rays to travel
along the fibreGlass of high Heavy, strong but 21
refractive index brittle and non- flexible Fibreglass Glass
Heavy, strong but
brittle and non-
flexible
Light, strong, tough,
resilient and flexible,
with high tensile strength
and not flammablePolyester plastic
Light, flexible, elastic
but weak and
inflammablePhotochromic glass Glass Transparent and not sensitive to light
Sensitive to light:
darkness when light
intensity is high,
becomes clear when
light intensity is lowSilver chloride, or silver bromide Sensitive to light Figure 9.9 Composite material and their new properties 22
CONCLUSION
We must appreciate these various synthetic industrial materials. One of the way is by
doing continuous research and development ( R & D ) to produce better materials used to
improve our standard of living. As we live in a changing world, our society is getting
more complex. New materials are required to overcome new challenges and problems we
face in our daily lives. Synthetic material are developed constantly due to the limitation
and shortage of natural materials. New technological developments are used by scientists
to make new discoveries.
New materials for clothing, shelter, tools and communication to improve our daily
life are developed continuously for the well-being of mankind. New needs and new
problem will stimulate the development of new synthetic materials. For example, the new
use of plastic composite material will replace metal in the making of a stronger and
lighter car body. This will save fuel and improve speed. Plastic composite materials may
one day used to make organs for organ transplant in human bodies. This will become
necessity with the shortage of human organ donors.
The understanding of the interaction between different chemicals is important for
both the development of new synthetic materials and the disposal of such synthetic
materials as waste. A responsible and systemic method of handling the waste of synthetic
materials and their by-product is important to prevent environmental pollution. The23
recycling and development of environmental friendly synthetic material should be enforced.
REFERENCES 1.
Tan Yin Toon, Loh Wai Leng, Tan On Tin, 2008, SUCCESS
Chemistry SPM, Oxford Fajar Sdn.Bhd.
2.
top related