Solvent debinding and critical thickness of ultrafine cemented carbides by prepared injection molding
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摘要: 分别以费氏粒度0.71 μm和0.53 μm的WC–10Co为原料，以石蜡基粘结剂体系为粘结剂，采用金属粉末注射成形技术制备不同厚度的超细硬质合金，研究溶剂脱脂过程以及试样厚度对溶剂脱脂的影响。结果表明，溶剂脱脂是溶解–扩散的过程，粘结剂中包裹WC颗粒的低分子组分石蜡逐渐被溶解，高分子组分作为骨架起支撑作用，使样品保持原有的形状。溶剂脱脂裂纹的本质表现形式是高分子组分骨架断裂。硬质合金注射成形存在一个脱脂临界厚度，基于本实验条件，两种不同粒度原料的硬质合金注射成形脱脂临界厚度分别为7.5 mm和6.5 mm。Abstract: Ultrafine cemented carbides with the different thickness were prepared by metal powder injection molding, using WC–10Co with the particle sizes of 0.71 μm and 0.53 μm as the raw materials and the wax-based binder system as the binders. The solvent debinding process and the influence of sample thickness on the solvent debinding were studied. The results show that, the solvent debinding is the process of diffluence and diffusion, the paraffin as the low molecular component in the binders covering the WC particles is gradually dissolved, and the macromolecule component acts as the skeleton to support, keeping the samples in the original shape. The essential form of the solvent debinding cracks is the fracture of the macromolecule component skeleton. There is a debinding critical thickness for the injection molding of the cemented carbides. Based on the experimental conditions in this paper, the critical thickness of injection molding for two kinds of raw materials with the different particle sizes is 7.5 mm and 6.5 mm, respectively.
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图 1 不同厚度的硬质合金注射成形试样
Figure 1. Cemented carbide injection molding specimens with different thickness
图 2 超细硬质合金注射成形坯脱脂前后的内部微观形貌：（a）脱脂前；（b）脱脂后
Figure 2. SEM images of the ultrafine cemented carbides by injection molding: (a) before debinding; (b) after debinding
图 5 脱脂温度不合理引起脱脂裂纹
Figure 5. Debinding cracks caused by the unreasonable debinding temperature
图 6 不同厚度试样的脱脂温度范围
Figure 6. Debinding temperature range of the specimens with the different thickness
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