Prakt. Met. Sonderband 38 (2006) 513 
tation and analyzed by laser powder analyzer. The microstructures of the sample were investigated 
e current- for polished and etched surfaces with optical microscope and SEM/EDS. 
fine Y211 
orn of the 3. Results and Discussion 
r, it is not 
pattern in 3.1 Effects of attrition milling on the mixed particle size 
nd phase 
the melt- Fine Y123 powder was better than coarse Y123 in yielding fine Y211 phase because the 
articles in large surface area associated with fine particles makes decomposition of Y123 phase into 
perties in a liquid phase and Y211 easy during incongruent melting. It is also beneficial to mix the 
BaCeO3 additives finer and more uniform with the Y123 powder by attrition milling to 
We report obtain finer second phase for the melt-textured sample. 
cially the The attrition milled powder mixtures consisting of Y123 and 10 wt.% BaCeO; for 30 min. to 
ns. 270 min. were analyzed by the laser particle size analyzer. Figure 1 shows the size 
distribution of the mixed powder with/without attrition milling. The average particle size of 
the calcined powder shown in (a) was 60. After 30 min. of attrition milling, the average 
powder size reduced to about 30 and then reduced further to 1.50 as the attrition milling 
time increased to 150 minutes. But, the average size of the particles slightly increase to 
ventional 2.00 at the milling time of 270 min. The increase of the powder size with attrition milling 
ty. In this time can be attributed to the agglomeration of the fine powder as the powder size reduced 
mount of to sub-micrometer scale. 
» particles 
6000 per 120008 10.006 20.000 
4.000 = 9.000 N 
3 powder 20% 100.000 8.006 00.00 
. 000 30.000 me 1000 
calcined 300 60.000 5000 3.00 
lls and a > 40000 a 40.00 
. 20 wow 2000 000 
hen dried 0x dum 000 uh 
. 0117 Jd 6.7% 51.47 304.244 9.115 0877 5720 5140 394 249 
ssed into (a)As calcined (bb) AM 30min (1.5mm BALL ) 
12.00 120000 12000 2000 
rocess of 10.000 100000 10000 000 
-texturing B.00¢ 30.000 200 000 
£.00 60.000 6.000 DM 
ane were +00 10.000 4000 2000 
ndicularly 7 000 200 a0 
: Tuy -4 0000 000 bee. 2000 
O single- 7 = 674 : 304.244 0116 NR77 6.720 51471 304944 
reatment. (c) AM 150min (1.5mm BALL ) (d) AM150min(1.5mm)+AM120min(0.65mm) 
cooled to Fig. 1: Size distribution of the attrition milled powder of Y123 precursor powder 
to room 
lers were Figure 2 shows the SEM micrographs of (a) calcined Y123 mixture and (b)~(d) the mixed