Fine grain casting tungsten carbide continuous production furnace

Abstract

The invention relates to a fine grain casting tungsten carbide continuous production furnace. The production furnace is divided into three parts, namely a feeding device, an upper furnace body and a lower furnace body. the integral structure of the production furnace is a vertical structure. The production furnace contains the feeding device, the upper furnace body, a conical throwing disk, the lower furnace body, a discharging pipe, a gas inlet nozzle and an observation pipe. The production furnace is characterized in that the inside of the upper furnace body is provided with a round graphite crucible with a central small hole at the bottom; and the conical throwing disk is arranged below the graphite crucible, the conical throwing disk is near the graphite crucible and performs high-speed circular motion around the axis, and the axis is parallel to the central vertical line of the graphite crucible to maintain a proper horizontal distance. Under the centrifugal force of the conical throwing disk, the solution is broken to tiny particles and the tiny particles are thrown on the inner wall of a water-cooled sandwich cylinder, thus the high temperature solution can be fast cooled and the fine grain casting tungsten carbide product with fine grains can be obtained; and the production furnace has high cooling speed, low degree of oxidation of material, low energy consumption and high yield, and can be used to realize continuous production operation.

Description

Fine-grain cast tungsten carbide continuous production furnace technical field The invention relates to a fine-grain cast tungsten carbide continuous production furnace, in particular to a fine-grain cast tungsten carbide continuous production furnace capable of continuously preparing cast tungsten carbide with a fine-grain structure in the cemented carbide industry. technical background At present, in the cemented carbide industry, the production of cast tungsten carbide generally adopts a horizontal carbon tube furnace. The mixture of tungsten powder and tungsten carbide powder is packed in a boat, and the boat is placed in the In the horizontal carbon tube furnace, the mixture is heated to a liquid state to form a cast tungsten carbide solution, and then the boat is pushed out of the furnace, and the operator pours the high-temperature cast tungsten carbide solution of about 2800 degrees into the In the cooling container, cast tungsten carbide products are obtained afte...

AI Technical Summary

Problems solved by technology

At present, in the cemented carbide industry, the production of cast tungsten carbide generally adopts a horizontal carbon tube furnace. The mixture of tungsten powder and tungsten carbide powder is packed in a boat, and the boat is placed in the In the horizontal carbon tube furnace, the mixture is heated to a liquid state to form a cast tungsten carbide solution, and then the boat is pushed out of the furnace, and the operator pours the high-temperature cast tungsten carbide solution of about 2800 degrees into the In the cooling container, cast tungsten carbide products are obtained after cooling. Practice has proved that this one-time pouring method makes the solution form larger lumps in the cooling container, resulting in slow cooling of the casting tungsten carbide solution, and the cast tungsten carbide obtained after cooling. The crystalline phase of tungsten carbide products is coarse dendritic grain structure (that is, "coarse grain cast tungsten carbide"), rather than fine grain cast tungsten carbide with fine grain structure, which is not suitable for high-end hard surface spraying materials

In addition, this method of intermittent heating and pouring outside the furnace also has disadvantages such as poor working conditions and serious oxidation of materials.

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