Titanizing and aluminizing agents for sponge titanium reactor and method

Abstract

The invention provides titanizing and aluminizing agents for a new reactor for producing sponge titanium and coating and permeating methods. Components of the aluminizing agent comprise aluminum powder, alumina and ammonium chloride; and components of the titanizing agent comprise titanium powder, alumina and ammonium chloride. The coating method comprises the following steps: coating the aluminizing agent on the external surface of the reactor, and coating the titanizing agent on the internal surface, wherein the total thickness of the aluminizing and titanizing coatings is 0.4 to 0.7 millimeter; and putting the coated reactor into heating equipment, degassing the reactor for 2 to 5 hours at the low temperature of between 150 and 300 DEG C, heating the reactor to between 650 and 1,100 DEG C under the protection of argon atmosphere, and preserving the heat for 4 to 10 hours. Through test, FeAl and Fe3A1 phases are mainly positioned on the external surface of steel in the method, and the content of aluminum is 18 to 55 weight percent. The method for aluminizing outside and titanizing inside at the same time controls the content of impurity iron in the sponge titanium to be lower than 0.02 percent while keeping the cost, improves the usage times of the reactor, and greatly reduces the production cost of the sponge titanium.

Description

technical field [0001] The invention relates to a method for titanizing and aluminizing a reactor for producing sponge titanium, in particular to a titanizing and aluminizing agent and a method for coating and infiltrating a new reactor using the titanizing and aluminizing agent. Background technique [0002] The new reactors used in the production of titanium sponge must be infiltrated with titanium. During the vacuum distillation process of titanium sponge, the temperature is as high as 1000°C. Under the high temperature for a long time, the iron in the reactor will infiltrate into the titanium sponge and the wall-climbing titanium. If The new reactor without titanium infiltration treatment will cause high iron content in titanium sponge and degrade, so the effect of titanium infiltration directly affects the product grade. [0003] Because the outer surface of the reactor is continuously oxidized and peeled off in a long-term high-temperature environment, a reactor will b...

AI Technical Summary

Problems solved by technology

Conventional methods tend to cause the infiltration agent to bond to the surface of the workpiece, and the aluminum content on the surface of the aluminized layer is high, which is prone to brittle Al 3 Fe, Al 5 Fe 2 phase, it is easy to fall off during use; the aluminum content on the aluminized surface is too low, and the high temperature oxidation resistance is poor