为了掌握燃气流量对羟基磷灰石(HA)粉末颗粒产生的影响,采用超音速氧焰喷涂(HVOF)技术制备了HA涂层,运用X射线、XRD和SEM分析了HA喷涂粉末颗粒的相组成,观察了涂层的形貌.结果表明:增加燃气流量,HA粉末颗粒表面的熔化程度提高,但整体熔化比例仅有微量增加(从13%增加到18%),原因是增大燃气流量在提高火焰温度的同时加快了颗粒的飞行速度,缩短了粉末颗粒在火焰中滞留的时间;火焰加热后3种颗粒结晶相只有HA;提高燃气流量降低了颗粒的结晶度(从91.4%降至73.8%);3种HA颗粒在涂层表面形成了3种典型的结构.
Hydroxyl apatite coatings were prepared by using high velocity oxy-fuel (HVOF) spraying. The effects of fuel flow rate on the phase composition and microstrueture of the hydroxyl apatite eoatinga were investigated by means of X-ray diffraction and scanning electron microscopy. Results show that hydroxyl apatite particulates are transformed to three types of coatings with different microatruetures after being sprayed at three kinds of fuel flow rates. The melting degree of the hydroxyl apatite powders was increased with increasing fuel flow rate, but the melted fraction of the hydroxyl apatite powders was only slightly increased therewith (from 13% to 18%). The reason lies in that, with increasing fuel flow rate, although the temperature of the flame is increased, the flying velocity of the powders and the time for them to dwell in the flame are shortened. At the same time, after being heated under different fuel flow rates, the resulting crystallized hydroxyl apatite coatings have single phase structure, but the crystallinity of the hydroxyl apatite powders is decreased from 91.4% to 73.8% with increasing fuel flow rate.
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