Disadvantage of high oxide formation - Material Science

Q.  Which of the following statements is/are true?
- Published on 06 Aug 15

a. Reduction method produces iron powders which are perfectly spherical
b. Drawback of high oxide formation in shotting processes can be reduced with use of inert gases
c. At certain temperature and pressure carbonyl of metal decomposes to give water and metal
d. All of the above

ANSWER: Drawback of high oxide formation in shotting processes can be reduced with use of inert gases

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    Discussion

  • Sravanthi   -Posted on 07 Oct 15
    Reduction method produces iron powders of irregular shape and porosity. This method is used to manufacture Fe, Co, Cu etc. Depending on the economy of operation H2, CO, NH3 etc are used as reducing agents. The size, shape and porosity can be controlled by this method as it is convenient, economical and flexible.

    Thermal decomposition produces iron powders of perfectly spherical shape and are purest of all commercial metal powders. The powder obtained by this process has excellent sinterability. In this method, carbonyl of respective metals decompose to give gas and metal. Carbonyls are volatile liquids and are produced when CO gas passes over powdered metal at 200o C – 270o C at a pressure of 70 to 200 atm.
    For e.g. Ni (CO)4 → Ni + 4 CO

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