Gel injection molding method of engineering ceramic

Abstract

The invention relates to a gel injection molding method of engineering ceramic, which comprises the following steps: (1) adding mixed engineering ceramic powder and a crosslinking agent carbomer accounting for 0.8-1.5 wt% of the mixed engineering ceramic powder into a solvent, and carrying out mixing and ball milling for 3-5 hours to obtain a stable suspension slurry; (2) adding an initiator accounting for 0.5-1.0 wt% of the mixed engineering ceramic powder into the slurry, carrying out ball milling for 7-9 minutes, and defoaming in a vacuum for 6-8 minutes; and (3) injecting into a mold, carrying out in-situ solidification colloid molding, drying, demolding, and drying in a constant temperature oven to obtain the engineering ceramic. The method is simple to operate, has the advantages of stable technique, controllable molding process, low production cost and high production efficiency, and is suitable for near-net size molding of various engineering ceramic powders.

Description

technical field [0001] The invention relates to a gel injection molding method for engineering ceramics. Background technique [0002] Forming is a key link in the production process of engineering ceramics with close dimensions and complex shapes. [0003] Gel injection molding is an advanced ceramic molding method, which provides an effective technical way to prepare engineering ceramics with complex shapes. Gel injection molding was proposed by M.A.Janney and O.O.Omatete of Oak Ridge National Laboratory in the United States in the early 1990s. The system used is acrylamide, but because acrylamide monomer has neurotoxicity, it is not conducive to human health and environmental protection. , thus limiting its scope of application. Although later M.A.Janney and O.O.Omatete developed gel injection molding of a series of low-toxic system organic monomers such as methacrylamide and 2-hydroxyethyl methacrylate, the control of the molding process of these organic monomers is re...

AI Technical Summary

Problems solved by technology

For example, gelatin, agarose, pectin, carrageenan (carrageenan), etc. have the characteristics of thermal sol, that is, they dissolve when heated to a certain temperature in water, and form gel and solidify when cooled, but the heating of the slurry will cause some Evaporation of water affects the viscosity of the slurry, making it more difficult to control the production process, thereby affecting the quality of the engineering ceramic body; the gel injection molding of the sodium alginate system needs to introduce a salt containing multivalent cations as a curing agent. Due to the introduction of impurity cations, it may have a negative impact on some properties of engineering ceramics, and the bending strength at room temperature is low

The strength of the engineering ceramic dry biscuit formed by gel injection molding using the above-mentioned non-toxic gel macromolecule is low, and the bending strength at room temperature is only 0.32-8MPa

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