A kind of preparation method of ceramic wire drawing die

Abstract

The invention belongs to the technical field of production of dies for novel materials and relates to a production method of a ceramic drawing die; the production method comprises the steps of preparing a suspension, forming a green body, sintering conventionally, and sintering by microwave; alumina and 3Y-TZP micropowder are subjected as materials to advanced isostatic one-step forming technique and microwave sintering technique to produce the ceramic drawing die; after sintering, polishing the surface of the ceramic drawing die is only required for use; wear-resistant crystal of the ceramic die is tightly combined in solid-phase combination manner, and the ceramic crystal has improved bonding strength and increased density; the ceramic is subjected to solid-phase sintering, integral hardness is improved, the ceramic crystal interfacial strength and toughness can resist drawing pressure stress and shearing damage, a wear mechanism of the drawing die is changed, the service life of the drawing die is 4-6 longer than that of a hard alloy die, the manufacture cost of the ceramic drawing die is lowered, and production steps are lessened at the premise of improving performance index, quality and production efficiency of ceramic material; the principle of the method is scientific and reasonable, and the yield is high.

Description

Technical field: [0001] The invention belongs to the technical field of mold preparation for new materials, and relates to a method for preparing a ceramic wire drawing mold. The two-phase composite ceramic material ZTA (zirconia toughened alumina ceramic) is used as a raw material, and gel injection molding + static pressure molding and conventional sintering are adopted. +Microwave sintering technology to prepare ceramic wire drawing molds. Background technique: [0002] There are three main materials for metal wire drawing dies: hard metal (WC-Co), polycrystalline (PCD), and diamond (ND). Hard alloy and diamond are traditional mold materials. Since the 1940s, hard alloy dies It has always been dominant in wire drawing molds. The characteristics of cemented carbide molds are good strength and toughness, excellent wear resistance, convenient mold repair, and relatively low cost. Most of the molds with specifications are still made of this material. However, since cemented ...

AI Technical Summary

Problems solved by technology

[0002] There are three main materials for metal wire drawing dies: hard metal (WC-Co), polycrystalline (PCD), and diamond (ND). Hard alloy and diamond are traditional mold materials. Since the 1940s, hard alloy dies It has always been dominant in wire drawing molds. The characteristics of cemented carbide molds are good strength and toughness, excellent wear resistance, convenient mold repair, and relatively low cost. Most of the molds with specifications are still made of this material. However, since cemented carbide is sintered by WC and Co at high temperature, the Co content is generally about 3-18. Adhesive wear or plastic deformation occurs, causing "network tungsten carbide" or "island tungsten carbide" to fracture and damage, resulting in mold wear and failure; polycrystalline (PCD) is a new type of wear-resistant material developed in the 1970s. Diamond microcrystals mixed with bonding metal are made through high temperature and high pressure. The wire drawing die made of polycrystalline has good mechanical strength. Because the random orientation of diamond microcrystals during the forming process overcomes the eccentric wear caused by the anisotropy of single crystals, Therefore, the wear resistance of the polycrystalline mold is excellent, which is 20-200 times that of the cemented carbide mold. The use effect of the polycrystalline mold is even better than that of the diamond mold. The high hardness brings great difficulties to mold repairing. The time and cost of mold repairing are much higher than that of cemented carbide molds. Generally, the repair cost of polycrystalline molds is about one-third of its price; diamond molds are expensive because of their high cost. Difficult, only used on finished molds that partially produce filaments

[0003] Compared with metals, ceramic materials have many excellent characteristics in the manufacture of wire drawing dies, and the cost of raw materials is much lower than that of cemented carbide, polycrystalline and natural diamonds; although the hardness of ceramic dies is slightly higher than that of cemented carbide, it is much lower than that of cemented carbide. Polycrystalline moulds, tests have confirmed that the quality of repairing ceramic molds by using the original cemented carbide mold repairing method fully meets the requirements, and there is no need to purchase additional equipment and increase mold repair costs for the use of ceramic molds; the reason why domestic enterprises have not generally used it is that: Although the cost of raw materials for making ceramic wire drawing dies is relatively low, the cost of making ceramic wire drawing dies by continuing the production process of cemented carbide dies (that is, the process of punching and grinding after firing) is very high. For ceramic materials, After firing, the material has high hardness and is difficult to grind. Therefore, the traditional processing method is too costly and difficult to popularize.

Images