Thursday, April 7, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

CrazyEngineers Forum - Mechanical & Civil Engineering

Abrasives

Posted: 07 Apr 2011 07:30 AM PDT

The common types of abrasives used in the industry are of two types.
1.Artificial and 2.Natural

The natural abrasives which are commonly used include
1.Sandstone: It is also well known as solid quartz. We grind the grind stones from this sand stones.

2.Emery: This is nothing but Aluminum oxide. Have you heard of emery paper? Well about 60% constituent is Alumina and the remaining Iron Oxide.

3.Diamond: This is the hardest material ever known to mankind till date. But we use crude or very less than gem quality stones. Have you seen the diamond in Brinnel or Rockwell hardness testing machine? Well then see the diamond also.

4.Corundum: It is also Aluminum oxide. about 75% is alumina while remaining are impurities.

Artificial: These are man-made ones.

1.Silicon carbide: Composition is 56parts sand, 2parts salt and 12parts of saw dust.
There are two types of it.
1.Green grit
It has 97% SiC
and 2. Black grit
It has 95% SiC.
It is second hardest substance after diamond.

2.Aluminum Oxide
When Iron oxide, Silica containing Hydrated Aluminum oxide, mineral bauxite, titanium oxide are heated with ground coke then we get Al2O3. There may also be many other methods. Please fell free to share.

Yup and before commenting there is one condition. which is please correct me if I am wrong. :happy:

How it is possible?

Posted: 07 Apr 2011 05:21 AM PDT

sir my friend has make a stove which is ignited with kersosene oil. but after 5 minutes it is ignited with water. how it possible? he has provided two valves and two diffrent pipes for water and kerosene in a same burner? he also provided two differnt tanks for water and kerosene. HOW IT IS POSSIBLE? I DONT UNDERSTAND.
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