Preparation method of TiB2 ultrafine powder material

Abstract

The invention relates to a preparation method of a TiB2 ultrafine powder material. The preparation method comprises the following steps of: (1) blending the following components by mass percent: 33.76-43.96% of Mg, 18.42-23.98% of B2O3, 16.89-22.00% of ZrO2 and 10.07-30.92% of NaCl; (2) uniformly mixing weighed raw material powders on a ball grinding mill; (3) placing uniformly mixed powder into a mould, and pressing the powder into a cake blank at the pressure of 15-30MPa; placing an ignition agent into a copper crucible in a reaction kettle, and then placing the cake blank on the ignition agent; introducing argon into the reaction kettle at room temperature; turning on a heating switch, exhausting again when temperature in the reaction kettle is increased to 180-220 DEG C, and then introducing 1.5-3MPa argon; and combusting the ignition agent when the temperature in the reaction kettle is increased to 250-300 DEG C, initiating a self-propagating combustion reaction of the blank by virtue of heat produced by combustion of the ignition agent, and turning off the heating switch at the moment until all the materials react completely and are converted into a product containing TiB2 blocks; and (4) taking out the product and grinding the product into powder, then leaching TiB2 with hydrochloric acid, and carrying out vacuum drying to obtain TiB2 ultrafine powder.

Description

technical field [0001] The present invention relates to TiB 2 Preparation technology of powder materials. Background technique [0002] TiB 2 It is an important boride material with special physical and chemical properties. It has a very high melting point, high chemical stability and excellent wear resistance. It is used as hard tool materials, abrasives, protective materials, cemented carbide additives and wear-resistant parts, etc., and has been widely used in these applications. research; meanwhile, TiB 2 It also has excellent electrical properties, and its conductivity is even better than that of metal titanium, which makes it able to make up for the deficiency of most ceramic materials. It is an important electronic ceramic material and can be used as an inert electrode material and high-temperature electrical components; TiB 2 Good oxidation resistance, it decomposes at 450°C to produce decomposition product B 2 o 3 The melting point is low (450°C), and it melts...

AI Technical Summary

Problems solved by technology

It has a very high melting point, high chemical stability and excellent wear resistance. It is used as hard tool materials, abrasives, protective materials, cemented carbide additives and wear-resistant parts, etc., and has been widely used in these applications. research; meanwhile, TiB 2 It also has excellent electrical properties, and its conductivity is even better than that of metal titanium, which makes it able to make up for the deficiency of most ceramic materials. It is an important electronic ceramic material and can be used as an inert electrode material and high-temperature electrical components; TiB 2 Good oxidation resistance, it decomposes at 450°C to produce decomposition product B 2 o 3 The melting point is low (450°C), and it melts into liquid B 2 o 3 A protective film can be formed on the surface of the material to prevent further oxidation inside the material, which makes it have good oxidation resistance, but when the temperature reaches above 1000 ° C, B 2 o 3 Volatile loss, material oxidation will intensify