Xiupeng WANG
,
Ji
,
ong YE
,
Yingjun WANG
,
null
,
null
材料科学技术（英文）
The morphology of a hydrated calcium phosphate cement (CPC) doped with several normally used additives was investigated by scanning electron microscopy (SEM) and the compressive strength of the cement was determined in this study. The hydrated products of CPC without additives was rod-like hydroxyapatite (HA) grains with around 2-5 μm in length and 100 nm in width. The addition of Sr obviously decreased the crystal size of the rod-like grains. CPCs containing carbonate, collagen and gelatin showed flake-like crystal morphology. Crylic acid-containing CPC presented flocculus-like structure. And malic acid-containing CPC exhibited oriented flake-like structure. The X-ray diffraction (XRD) analysis showed that the additives used in this study did not alter the hydration products of the cement. The compressive strength tests indicated that the compressive strength of the cement with rod-like morphology HA crystals was much higher than that of the cement with flake-like morphology HA crystals, and the cement with oriented flake-like morphology HA crystals exhibited the poorest compressive strength.
关键词:
Calcium phosphate cement
,
null
,
null
Jingfei LUAN
,
Ji
,
ong HU
,
Zhenfeng ZHOU
,
Hongying WANG
材料科学技术（英文）
Using electrode as laser cladding materials, the microstructure and wear resistance of laser-clad layer of ductile cast iron was studied. The laser-clad layer can be subdivided into the melted zone where existed large amounts of austenite, graphite nodules and some carbide, and the solid state transformation zone which included martensite and austenite below the melted zone. The Ti combined with C to form TiC, increasing the wear resistance. The Co significantly increased the wear resistance compared with Ti.
关键词:
