聚氨酯泡沫粉末在羟基磷灰石晶须多孔陶瓷材料中的应用

Application of Polyurethane Foam Powder in Hydroxyapatite Whisker Porous Ceramic Materials

采用液氮冷却破碎法,将聚氨酯海绵泡沫制备成10~400μm左右的微米级粉末,用于羟基磷灰石晶须多孔陶瓷材料的制备和研究。通过SEM表征了聚氨酯泡沫粉末的表面形貌,XRD、SEM、FT-IR等分析了烧结后多孔陶瓷材料的成分、形貌以及聚氨酯的残留。同时研究了聚氨酯泡沫粉末添加量对最终产品孔隙率和力学性能的影响。结果表明:650℃煅烧后的多孔陶瓷材料主要含有羟基磷灰石和β-TCP双相;多孔结构为蜂窝直通孔和侧壁孔,尺寸分别为300μm左右和10~80μm。添加32%聚氨酯泡沫粉末的多孔陶瓷其最大平均抗压强度为1.18MPa;当聚氨酯添加量为38%时,材料的平均孔隙率最高,达90.48%。

Polyurethane( PU) foam powders were obtained by crushing the polyurethane foam sponge after liquid nitrogen freezing,and the ones sieved in the range of 10-400 μm were selected to fabricate the porous ceramic material based on hydroxyapatite( HAP) whisker. The PU foam powders were characterized via SEM photographs. XRD,SEM and FT-IR etc were employed to examine the structure,morphology and PU residues of the porous ceramic material. Besides that,the effort of PU contents on the porosity and physical property of the ceramic material were also investigated. The results showed that: the main phase of porous ceramic material calcined at 650 ℃ contains biphase of HAP and β-TCP.Honeycomb-shaped structure shows the straight-through holes and side-wall holes whose cell( pore)diameter are about 300 μm and 10 μm to 80 μm,respectively. Porous ceramic material added with 32%PU powders shows the top average compressive strength of 1. 18 MPa,and the highest average porosity of sample is 90. 48% when the addition of PU is 38%.