PRODUCTS AND TECHNOLOGIES     

  
    Special Technologies:

    This technology, invented by Mr. Liu Yuzhong, pioneers in generating crystalline LiTa₃ film with [110] preferred orientation directly from Ta substrate through molten-salt electrode- chemical reaction. When tantalum spinneret is treated by this technology, a polycrystalline lithium-tantalite LiTaO₃ modifying layer, which consists of an insulating film layer and conductive transition layer underneath (See the sketch), is generated directly from Ta substrate. The modifying layer exists homogeneously in tantalum spinneret surface including the capillary inner walls. The hardness of LiTaO₃ film layer reaches HV700-800, while the hardness of transition layer in capillary exit surface is HV400-500, still much higher than the hardness of Au-Pt(Rh) spinneret at HV18O-280, and its bending elastic limit reaches 119Kg/cm². Consequently, film-coated tantalum spinneret is more strongly resistant to score and scratch and the service life is prolonged.

    Most important of all, a special electrode-potential difference suitable for spinning of chemical fiber between the conductive tantalum capillary exit surface and insulating LiTaO₃ capillary inner walls is achieved so that it is not easy to absorb tiny colloidal suspensions. Thus the spinneret unplanned replacement frequency and fiber defect rate, broken filament rate decreased to be much lower than Au-Pt (Rh) spinneret. That is, the spinnability of High Hardness Film-coated Tantalum spinneret (HHFCTS) is as good and even better than Au-Pt (Rh) spinneret.

    Years of practice prove that High Hardness Film-coated Tantalum Spinneret (HHFCTS) is a successful substitute for Au-Pt(Rh) spinneret.

Film-Coated Capillary Structure