An improvement in sintering property of beta-tricalcium phosphate by addition of calcium pyrophosphate.
The sintering behavior of calcium pyrophosphate (CPP, Ca2P2O7)-doped beta-tricalcium phosphate [TCP, Ca3(PO4)2], prepared by solid state reaction, was investigated in-situ, using dilatometry. Pure beta-TCP undergoes phase transition to alpha-TCP at about 1200 degrees C; hence pure beta-TCP ceramics should be sintered bclow 1200 degrees C. Pure beta-TCP sintered body can achieve a relative density of only 86% when sintered at 1150 degrees C. However, the addition of CPP in the range of 0.5-3 wt% delays phasc transition of beta-TCP and enables sintering of beta-TCP at 1200 degrees C without a phase transformation to alpha-TCP. Due to this effect of CPP added to TCP, CPP-doped beta-TCP ceramics with relative density over 95% could be obtained when sintered at 1200 degrees C for 2 h.
Ryu
Hyun-Seung
HS
School of Materials Science & Engineering, College of Engineering, Seoul National University, South Korea.
Youn
Hyuk-Joon
HJ
Hong
Kug Sun
KS
Chang
Bong-Sun
BS
Lee
Choon-Ki
CK
Chung
Sung-Soo
SS
D001843:Bone Cements; D002130:Calcium Phosphates / Q000737:chemistry*; D002131:Calcium Pyrophosphate / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D006358:Hot Temperature; D008855:Microscopy, Electron, Scanning; D013816:Thermodynamics; D014961:X-Ray Diffraction
D001843:Bone Cements; D002130:Calcium Phosphates; C485817:beta-tricalcium phosphate; C018392:tricalcium phosphate; D002131:Calcium Pyrophosphate