6029 g of Fe .
Before using the ball milling we need to measure the mass of the three ball, by using the balance: .
mass of 3 Balls = 37.6584g.
Now, to find the mass of powder, using this equation:.
mass of Balls 20 = mass of powder .
37.6584 g 20 = 1.8829 g .
Then the mass of BaO and the mass of α-Fe2O3 are:.
1.8829 Ã- o.1378 = 0.2594 g of BaO.
1.8829 Ã- 0.8620 = 1.6230 g of α-Fe2O3 .
After milling the powder mixture (BaO with α-Fe2O3), we obtain a new product of powder. We need to measure the mass of this product: the mass of powder after milling = 1.5051 g of powder.
Then the yield after milling is: .
yield = ((M " Mm)/ M) Ã- 100 .
where, .
M: the mass of powder before milling.
Mm: the mass of powder after milling. .
((1.8829 " 1.5051)/ 1.8829) Ã- 100 = 20.06% .
the lost mass of the mixture powder is stuck on balls, the walls of the bowl and the lead.
3 Experimental Parts .
3.1 Ball Milling .
Ball mills are the most effective laboratory mills for batch-wise, rapid comminution of medium-hard to hard samples down to the finest particle sizes. The grinding can take place dry or wet. The mills can also be used for mixing and homogenisation [3].
Data of Device [3] .
Voltage/connection values: 100-120/200-240 V/1~.
Frequency: 50-60 Hz.
Input Power: 1100 W.
External Control: Yes/RS232.
Operating Principle: Impact.
Grinding Tools: Grinding bowls (80,250, 500 ml) and grinding balls (0.5-40 mm).
Materials of the grinding tools: Agate, sintered corundum, silicon nitride, zirconium oxide, stainless steel, hardened steel, hard metal tungsten carbide.
Main disc speed: 100-650 rpm.
Gear ratio: i relative = 1 : -1.82.
Max. feed size: (depends on material) 10 mm.
Min. sample quantity: 10 ml.
Max. sample quantity: 225 ml.
Final fineness: < 1 µm.
Dimensions: (W x D x H) Table unit 37x53x50cm.
Weight: 63 kg.
In this research project, we performed mechanical alloying starting from a mixture of BaO and α-Fe2O3 oxides to produce Nanocrystalline BaFe12O19 compound.
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