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Extrusion Dies – Technox Zirconia Ceramic ( ZrO2 ) Extrusion Dies from Dynamic-Ceramic Ltd
Topics Covered
Background
Process Conditions
Conventional Materials
Technox 500®
Customer Support
Background
The effectiveness of Technox 500® extrusion dies can be attributed to the unique combination of properties, high strength, refractoriness, high sintered density, high temperature stability and low thermal conductivity, wear & corrosion resistance and hardness. Technox 500® has demonstrated its ability not only to withstand the severe thermomechanical stresses associated with high speed extrusion, but also to provide an excellent surface finish to the extruded product.
Process Conditions
The simplest and most commonly extruded geometry's are either rods or tubes, which are extruded at speeds up to 20m/s at temperatures approaching 1250°C and extrusion pressures of approximately 1000MPa.
Conventional Materials
Conventionally dies are typically made from Toolsteels, Tungsten Carbide and super alloys such as Stellite. The major shortcoming of these materials, is their deformation in use. Resulting poor dimensional stability of the extruded product and, despite the use of lubricant, poor surface finish quality.
Technox 500®
Technox 500® has proved to be a very successful extrusion die material. Technox 500® is strong, tough and unlike conventional materials not susceptible to creep at extrusion temperatures, maintaining product size for the life of the die. Technox 500® extrusion dies typically provide a 10 fold Lifetime increase compared with Stellite. The fine microstructure of Technox 500® allows excellent surface finishes to be achieved on the die, which leads to improved extruded product quality. In addition the low thermal conductivity of Technox 500® significantly reduces the heat transfer from the extruded product into the die body and holder, a problem associated with conventional die materials.
Technox 500® dies can be shrink fitted into H13 cases, Dynamic-Ceramic sales engineers can recommend the amount interference and provide guidance on how to shrink fit. We are also able to offer ceramic die and case assemblies.
Figure 1. Technox 500 microstructure.
Figure 2. Technox 500 dies.
Customer Support
Dynamic-Ceramic manufactures both finished, custom-made dies or blanks that can be finished in your tool room. Understanding the difference metal and ceramic dies is key to successful application of ceramic dies. Dynamic-Ceramic’s flexible approach to manufacturing and technical support is unequalled in the ceramics industry.
Source: Dynamic Ceramic Ltd.
