Chemical Engineering - Chemical Engineering Basics - Discussion

2. 

The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.

[A]. hard
[B]. soft
[C]. silicon carbide
[D]. aluminium oxide

Answer: Option D

Explanation:

No answer description available for this question.

Kaleem said: (Nov 14, 2012)  
Aluminium oxide should be a soft material, how can be it used as a cutter?

Kasturi said: (Mar 28, 2013)  
Aluminium oxide is used for its hardness and strength and low specific heat.

Seenu said: (Apr 18, 2013)  
Yes its one of the main property of aluminum mixer.

Sandhiya said: (May 9, 2013)  
Aluminium oxide is have a high temperature.

Rumela said: (May 11, 2013)  
Silicon carbide has a greater impact-resistance than aluminium oxide. Then why can't we use SiC?

Swap said: (Jun 22, 2013)  
Aluminium oxide is resistance to corrosion and its a hard metal too.

Secret Gal said: (Jul 17, 2013)  
Then whats the concept behind using silicon coating in turbine blades?

Kenneth said: (Sep 24, 2014)  
Silicon carbide or aluminum oxide are both used. But, when cost and readily available material is needed Aluminium oxide is used.

Jayanta Mondal said: (May 10, 2015)  
Silicon carbide or aluminium oxide are property is important for cutting tools.

Kaushik said: (Sep 13, 2015)  
May be al203 is cheaper.

Subodh K.Singh said: (Feb 26, 2016)  
Oxide of metals have tendency of alkalinity but some do not follow. Aluminium is one of those. Aluminium oxide is neutral compound and this is neither acidic nor alkaline. It does not react with cutting tools. This may be one of the reason.

Syed Amanullah said: (Nov 8, 2016)  
@Kaushik. al203 is wrong.

So please explain this answer.

May Jane said: (Dec 25, 2016)  
Aluminum oxide is the most common abrasive used in grinding wheels. It is usually the abrasive chosen for grinding carbon steel, alloy steel, high-speed steel, annealed malleable iron, wrought iron, and bronzes and similar metals while Silicon carbide is an abrasive used for grinding gray iron, chilled iron, brass, soft bronze and aluminum, as well as stone, rubber and other non-ferrous materials.

May Jane said: (Dec 25, 2016)  
Aluminum oxide is the most common abrasive used in grinding wheels. It is usually the abrasive chosen for grinding carbon steel, alloy steel, high-speed steel, annealed malleable iron, wrought iron, and bronzes and similar metals while Silicon carbide is an abrasive used for grinding gray iron, chilled iron, brass, soft bronze and aluminum, as well as stone, rubber and other non-ferrous materials.

Abhinandan Salagar said: (Apr 30, 2017)  
Silicon carbide is mostly used material for making cutting tool, but aluminium oxide is cheaper than silicon and it has lower capacity.

Dilip Kumar Sahu said: (Oct 14, 2017)  
Aluminum oxide (Al203) is the most common abrasive used in grinding wheels. It is usually the abrasive chosen for grinding carbon steel, alloy steel, high-speed steel, annealed malleable iron, wrought iron, and bronzes and similar metals while Silicon carbide is also can be used but due to availability & Cost with Respect to Performance.

Vignesh D said: (Feb 14, 2018)  
Ans : D (Al2O3).

Aluminum oxide or fused corundum (Al2O3) is a crystalline aluminum oxide obtained from bauxite clay containing about 60% of aluminum. It is referred to as the fused corundum due to the technology of its production in electric arc furnaces.

The purity percentage of aluminum oxide (94"99%) and degree of its hardness makes it one of the varieties of grain used for manufacture of grinding or cutoff wheels or other abrasive tools for processing of wood or metals.

Ivana said: (Oct 14, 2018)  
Aluminium oxide is used for general purposes while Silicon carbide is harder and brittle so it is used for stones, cement and chilled iron.

Omar said: (Mar 16, 2019)  
Aluminium oxide is formed in the form of harsh white crystals, which do not dissolve neither in the acids nor the bases, and show no desire for moisture (hydration).

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