High-temperature-resistant mold and manufacturing method thereof

Abstract

The invention discloses a high-temperature-resistant mold. The high-temperature-resistant mold is prepared from components including, by mass, 70wt%-85wt% of NbC powder, 14wt%-25wt% of bonding phase powder and 1wt%-5wt% of Mo2C powder, and the bonding phase powder is Co powder and / or Ni powder. The manufacturing method of the high-temperature-resistant mold sequentially comprises the following steps that material preparation is conducted, specifically, the powder is prepared according to the proportion; paraffin and oleic acid are poured into a ball mill to be subjected to ball milling, the adding proportion of the paraffin is 1.8%-3.0% of the total mass of the ingredients, the adding proportion of the oleic acid is 0.05%-0.2% of the total mass of the ingredients, the ingredients and alcohol are added after the paraffin and the oleic acid are evenly mixed, the adding amount of the alcohol is 200-300 g per kilogram of the ingredients, and the ball milling time is 24-36 hours; spray granulation is conducted, specifically, discharging is performed by the aid of a 250-mesh screen, materials are transferred into a spray tower, the feeding pressure is 0.5-1.5 Kpa, the temperature of a spray outlet is controlled to be 95+ / -10 DEG C, and particles of which the fluidity is 14-18 s and the loose density is 2.0-2.4 g / cm<3> are prepared; and pressing, fettling and sintering are conducted. The heat conductivity of the material can be improved, and the internal and external temperature difference of the alloy ca be reduced, so that the internal stress and deformation can be reduced, the hardness and strength of the material can be ensured, and the corrosion resistance and burning resistance of the mold at the high temperature are improved.

Description

technical field [0001] The invention relates to a high temperature resistant mold and a manufacturing method thereof. Background technique [0002] High temperature resistant molds generally refer to hot forging molds, hot pressing molds, red punching molds, etc. The materials of high temperature resistant molds on the market are generally high-chromium cast steel or WC-based cemented carbide. These materials have the problems of large thermal deformation after heating, high thermal stress, and insufficient anti-corrosion and anti-burning ability at high temperature. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide a high temperature resistant mold and its manufacturing method, which can effectively solve the problems of insufficient corrosion resistance and burning resistance at high temperature of the existing mold made of high chromium cast steel or WC-based cemented carbide. [0004] In order to solve the above-mentioned technical p...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-temperature resistant mold and its manufacturing method, which can effectively solve the problem of insufficient corrosion resistance and anti-burning ability at high temperatures for existing high-chromium cast steel or WC-based hard alloy molds

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