基于Pro／E二次开发的直齿圆柱齿轮的自动建模

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第 1期 张小立，等：不同配方下沉淀法制备羟基磷灰石的纯度 · 59 ·The Purity of Hydroxylapatite(HAP)Prepared byDifferent M ethod of PrecipitationZHANG Xiao-li，ZHANG Zhao-jun，LIU Ying，ZHANG Rui-jie(Zhongyuan University of Technology，Zhengzhou 450007，China)Abstract： HAP is prepared by method of precipitation using Ca(NO3)2 ·4 H2 O and H3 PO4 withCa(NO3)2 and NH4 H2PO4 as raw materials，respectively.The results show that the affection of pH value andcalcination temperature to purity are consistent in both dispensation.The higher the p H values，the better thepurity of HAP：the higher the calcination temperature，the better the purity of HAP.But the temperatureshould be 1ess than 1 000℃ 。

Key words： hydroxylapatite(HAP)；method of precipitation；purity(上接第 8页)5 结 语本文提出了-种基 于 Pro/E二次开发 的直齿 圆