Sudhakar A.N., KULVIR SINGH, Markandeya R., Kaushik D.
Ceramic Metal Matrix Composite, Centrifugal Casting, Heat Transfer, High Chrome, Pulveriser Grinding Media.
In order to fabricate trimaterial ceramic metal matrix composite (CMMC) inserted grinding roll for Pulveriser application in thermal power plants, a novel method is established by finalizing the intrinsic process parameters to fabricate grinding roll for bowl mill application with optimum wear resistance properties. In the first step, ceramic pads are fabricated with spherical ceramic particles of size range 1.5-3mm dia as a mixture of ZrO2 (30 wt %), TiB2 (6 wt %), Al2O3 (60 wt %) with minor addition of Co (4%), using alumina-sodium alginate slurry sintered at 16500C for 5 Hrs. In the second step, high chrome metal is poured into the CO2 mould containing the ceramic pads positioned at designated location in the mould cavity to make ceramic metal matrix composite inserts. In the third and final step, the ceramic metal matrix composite inserts are assembled in centrifugal die to occupy the working surface of the grinding roll made by pouring Spheroidal Graphite (SG) Iron while incorporating differential cooling rate at different zones of the roll through a special mechanism devised for the purpose and achieved the desired hardness (64HRC) of the roll. This resulted in a minimum running life of 12000 hours as against the existing 10000 hours running life of Pulveriser bowl mill grinding roll.
Article Details
Unique Paper ID: 156776

Publication Volume & Issue: Volume 9, Issue 4

Page(s): 674 - 682
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