Chap15_1pg - F , T.' iei j, et-., , F.1, };:j fi: $, +i,....

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Unformatted text preview: F , T.' iei j, et-., , F.1, };:j fi: $, +i,. :1r: F Ildlerlnls [erdrllc b A i 15-21 The specificgravityof Al2O3s 3.96g/cm3. ceramicpart is produced y sintering i I aluminapowder. t weighs80 g when dry,92 g afterit hassoakedn water,and58 g p in when suspended water.Calculatethe apparent orosity,the true porosity,and the closedpores. p Solution: From t he p roblem s tatement, : 3 .96, W d: 8 0 g , W n : 9 2, a nd 1 4/ 58. F rom t he e quations, : ffi" apparentporosity 1 00:f fi * 1 00: 3 s.z9vo The b ulkdensity i s B - W d/(W* - W ,) : 8 0/(92 - 5 8; - 2 .3529g l"^t. Therefore: t : o ^ * 100 : 3.96 2 .3529X 1 00: 4 0.58Vo truep orosity p 3.96 p closed orosity: 4 0.58 3 5.29: 5 .29Vo ...
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