Some thoughts on addressing the problems of blackening, yellowing, magnesium chloride inclusions, and hardening in the quality of sponge titanium products
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During the distillation process, titanium sponge does not completely remove magnesium and magnesium chloride, mainly because both magnesium and magnesium chloride remain in liquid form and are trapped in the capillaries of the titanium. Due to the adsorption effect of the capillaries, the diffusion resistance of volatile components into the space increases. The reduced product, sponge titanium, undergoes prolonged high-temperature sintering during the vacuum distillation process, gradually becoming more dense; its capillary pores shrink over time, which prevents the volatile components from escaping and ultimately results in the formation of cores and hard spots within the product. Due to the very low thermal conductivity of titanium sponge, it is difficult for us to accurately control the temperature during reduction and distillation.
Helium can be used as an inert gas for protection during the distillation process; it has a high thermal conductivity, so the distillation efficiency should be better compared to using argon for protection. However, the cost will be relatively high~~~~
Reply to 2# blackeyes121: The production of titanium sponge is carried out through vacuum distillation, and no argon is used during this distillation process; argon is only employed for protection during or after the distillation is stopped. Therefore, any inert gas will do, and argon is sufficient.
Pangang produces the highest-grade sponge titanium – News released by China Metallurgical Equipment Parts Network, Date: 2011-10-13. It was learned from the Sponge Titanium Plant of Pangang Titanium Company that, out of the 32 tons of sponge titanium produced recently, 9.4 tons were ultra-soft sponge titanium with a Brinell hardness below 90, as per the company’s standards. This is the highest-grade titanium sponge product produced by this factory, following the creation of titanium sponge products that meet **standard grade zero. It is understood that ultra-soft titanium sponge with a enterprise-standard Brinell hardness of less than 90 is one grade higher than the **standard grade 0 product, representing the highest grade among titanium sponge products. Sponge titanium products of such high quality can be widely used in high-end fields such as aviation, aerospace, navigation, and the manufacture of precision instruments. According to the relevant officials at the factory, all analytical parameters of the ultra-soft sponge titanium produced this time meet the requirements specified in Ukraine’s standards for such products. This indicates that Panzhihua Iron and Steel’s sponge titanium has filled the gap in China’s sponge titanium industry, where it was not possible to produce products with a Brinell hardness below 90; it also shows that the quality of Panzhihua Iron and Steel’s sponge titanium is at a level that is leading in China and advanced on the international scale. It is reported that since starting trial production, the factory has placed great emphasis on product quality; by taking into account the actual production conditions, it has improved its processing equipment and established strict evaluation standards, linking product quality to awards for technological innovation in the workshops. At the same time, strengthen the inspection and analysis of raw materials upon their arrival at the factory, and distribute the key indicator parameters obtained from these analyses to the production workshops so that the workers involved in production are aware of them. This article is from: China Metallurgical Equipment Parts Network (http://www.cmepc.org.cn). For the detailed source, see: http://www.cmepc.com/html/*nchanpin/201110/13-54390.html