Wood fiber - sodium silicate mixtures for additive manufacturing of composite materials
Wood fiber - sodium silicate mixtures for additive manufacturing of composite materials
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DOI：
10.1007/s00107-022-01861-z
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发表时间：
2022-08
影响因子：
2.6
通讯作者：
Berlinda O. Orji;Conal Thie;Kenneth V Baker;M. Maughan;A. McDonald
中科院分区：
文献类型：
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作者：
Berlinda O. Orji;Conal Thie;Kenneth V Baker;M. Maughan;A. McDonald
已经探索了木纤维和硅酸钠（SS）粘合剂的复合混合物作为用于木基复合材料的增材制造的可行材料。研究了50-60%木纤维和50 - 40% SS的混合物。通过差示扫描量热法（DSC）和动态流变仪研究了这些配方的固化行为。对于SS观察到83 °C的放热固化峰，并且随着木纤维的添加而增加到153和163 °C。流变流动曲线表明，较高的粘度值为50/50共混物和较低的值为SS。制造定制的挤出系统，并挤出50/50湿共混物，在不同温度下固化，并表征阻燃性、机械、热和吸水性能。通过傅里叶变换红外（FTIR）光谱法测定固化前后的表面化学变化。三点弯曲试验表明，木纤维的加入提高了复合材料的力学性能，但不同的固化温度对复合材料的力学性能有影响，复合材料的热稳定性随固化温度的升高而提高。这种挤出的木材-SS复合材料显示出用于增材制造的前景。
A composite mixture of wood fiber and sodium silicate (SS) binder has been explored as a viable material for use in additive manufacture of wood based composite materials. Mixtures of 50–60% wood fiber and 50 − 40% SS were explored. The curing behavior of these formulations were examined by differential scanning calorimetry (DSC) and dynamic rheometry. An exothermic curing peak of 83 °C was observed for SS and increased to 153 and 163 °C with the addition of wood fiber. Rheology flow curves showed higher viscosity values for 50/50 blends and lower values for SS. A custom extrusion system was fabricated and 50/50 wet blends were extruded, cured at different temperatures, and characterized for flame retardancy, mechanical, thermal, and water absorption properties. Surface chemistry changes before and after curing were determined by Fourier Transform Infrared (FTIR) spectroscopy. Mechanical properties, determined by three-point bend testing, improved with the addition of the wood fiber but varied with different curing temperatures and thermal stability of the composites increased with curing temperature. This extruded wood-SS composite shows promise for use in additive manufacturing.