Ultra-fine Tungsten Carbide Rod Extruded Agent Characteristics
As the volume fraction of the ultra-fine tungsten carbide rod extruded agent reach to 30%~60%, therefore, the choice of extruded agent has a decisive impact on the temperature, removal process of the knead. The characteristics of ideal extruded agent and the result of the improper choice of extruded agent are listed below.
| Process elements | Claim |
| Mobility | The extrusion temperature of the viscosity, volatility and the viscosity is small; cooling after a certain rigidity and strength; molecular weight. |
| Reaction with tungsten carbide powder | Good adhesion of the powder and the contact angle is small; the powder capillary action; chemically inert. |
| Removal Process | The different characteristics of multi-component composition; decomposition toxic, non-corrosive; low ash; decomposition temperature higher than the extrusion temperature and the kneading temperature. |
| Preparation | Inexpensive; safety and no pollution; room temperature stability, long shelf life, non-hygroscopic; non volatile; high thermal conductivity; low coefficient of expansion; soluble in common solvents. |
| Process | Forming agent's behavior | Defects caused by improper selection may |
| Extrusion | Flowability of the powder produced after molding to maintain billet shape. | Rheology poor, easy to produce billet surface microcracks. |
| Removal | Removed completely; removal process remains billet no deformation, no damage. | Multi-residue; removal for a long time; easy to produce billet surface bubbling, cracking deformation. |
| Sintering | Less carbon residue and ash. | Carbon residue and ash, causing unstable quality bar. |
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