Preparation method of superfine ceramic powder injection molding mixture

Abstract

The invention discloses a preparation method of a superfine ceramic powder injection molding mixture, which belongs to the technical field of ceramic injection molding. The preparation method of the superfine ceramic powder injection molding mixture comprises the steps: carrying out ultrasonic dispersion or high-speed ball grinding dispersion and surface modification of submicron or nanometer level ceramic powder in surface active agent solution; evenly mixing the surface modified powder with a non water-solubility organic binding agent, a water-solubility organic binding agent and other additives in a mixer according to a specific order; injecting and molding obtained injecting and mixing material on an injection molding machine to obtain a blank body; and quickly degreasing the blank body by water in water and ethanol mixing solution with a certain proportion under a certain degreasing temperature system. The obtained water-degreased injection material has even mixture, high strength of a green blank and good fluidity. The degreasing method has high degreasing speed and good blank shape maintaining performance and avoids the defects of cracking, bubbling, and the like.

Description

technical field [0001] The invention belongs to the technical field of ceramic injection molding, and discloses a preparation method and a degreasing method of a superfine ceramic powder injection molding compound. Background technique [0002] Ceramic injection molding is a near-net-size molding technology that can continuously, efficiently, and low-cost manufacture ceramic parts with high dimensional accuracy and complex shapes. Its products are widely used in energy, environmental protection, automobiles, aerospace, chemical industry, biomedical and other fields . [0003] Water degreasing is a new chemical degreasing method that introduces a thermoplastic and water-soluble polymer binder system into ceramic injection molding. It has high degreasing efficiency, easy control of degreasing defects, energy saving and environmental protection, and is suitable for complex shapes and large sizes. Advantages such as molding and preparation of ceramic parts, so as to overcome th...

AI Technical Summary

Problems solved by technology

[0003] Water degreasing is a new chemical degreasing method that introduces a thermoplastic and water-soluble polymer binder system into ceramic injection molding. It has high degreasing efficiency, easy control of degreasing defects, energy saving and environmental protection, and is suitable for complex shapes and large sizes. Advantages such as molding and preparation of ceramic parts, so as to overcome the disadvantages of low degreasing rate and long time caused by current thermal degreasing

However, ultra-fine ceramic powders are often used in the manufacture of high-reliability and high-performance structural ceramics, and ultra-fine ceramic powders are not easy to disperse in the water degreasing binder system, and are easy to agglomerate, resulting in decreased fluidity and poor uniformity of the injection mixture.

At the same time, the single use of water solvent degreasing, the degreasing rate is not easy to control, and it is easy to cause defects such as cracking and bubbling