With reference to the Vacuum Arc Remelting (VAR) furnace and titanium production, which of the following statements is/are correct?
1. VAR is primarily used for purifying copper and aluminum alloys under atmospheric conditions.
2. Titanium is primarily extracted from bauxite and cassiterite ores.
3. India recently commissioned its first private sector VAR furnace for producing aerospace-grade titanium alloy.
4. Titanium alloys are widely used in medical implants due to their biocompatibility and corrosion resistance.
Select the correct answer using the code given below:
Explanation: Statements 3 and 4 are correct, while 1 and 2 are incorrect.
Statement 1 is incorrect; VAR is used to purify alloys like stainless steel, nickel-based, and titanium-
based alloys under vacuum conditions, not atmospheric conditions or primarily for copper and aluminum.
Statement 2 is incorrect; titanium is primarily extracted from ilmenite and rutile ores, not bauxite and cassiterite.
Statement 3 is correct; India recently commissioned its first private sector VAR furnace for producing aerospace-grade titanium alloy.
Statement 4 is correct; titanium alloys are widely used in medical implants due to their biocompatibility and corrosion resistance.
Explanation: Statements 3 and 4 are correct, while 1 and 2 are incorrect.
Statement 1 is incorrect; VAR is used to purify alloys like stainless steel, nickel-based, and titanium-
based alloys under vacuum conditions, not atmospheric conditions or primarily for copper and aluminum.
Statement 2 is incorrect; titanium is primarily extracted from ilmenite and rutile ores, not bauxite and cassiterite.
Statement 3 is correct; India recently commissioned its first private sector VAR furnace for producing aerospace-grade titanium alloy.
Statement 4 is correct; titanium alloys are widely used in medical implants due to their biocompatibility and corrosion resistance.