Introduction of two common forming processes of zirconia ceramic center rod

As a special industrial ceramic, zirconia ceramics are used in various fields of life, and users' feedback on its quality and performance is also very good. Generally speaking, it is also called engineering ceramics, fine ceramics, etc. It is an inorganic non-metallic material that is resistant to high temperatures, wear, and corrosion. Its melting point is up to degrees Celsius. It is one of the materials with good fire resistance in nature. It can also display electricity, magnetism, light, and sound under specific conditions. And other special functions. Therefore, it can be applied in many fields and is a product worthy of our trust. In addition to some ceramic parts with different shapes, ceramic rods made of zirconia are also a super common product form. All aspects must be fully mastered to help better use.

Its excellent high temperature resistance is used as induction heating tube, refractory material, heating element. Structural parts have sensitive electrical performance parameters and are mainly used in the fields of oxygen sensors, solid oxide fuel cells, and high-temperature heating elements. In addition, zirconia is widely used in thermal barrier coatings, health care, refractory materials and other fields. Because of its high toughness, high flexural strength and high wear resistance, excellent thermal insulation performance, thermal expansion coefficient close to steel and other advantages, it is widely used in the field of structural ceramics: grinding balls, nozzles, ball valves, miniature fan shafts, Fiber optic pins, wire drawing dies and cutting tools, wear-resistant knives, light golf clubs and other room-temperature wear-resistant zero devices.

The center rod made of zirconia ceramic is a ceramic rod with excellent performance. The forming process includes dry press molding, isostatic press molding, injection molding, hot die casting molding, casting molding, injection molding, plastic extrusion molding , Colloidal solidification, etc. Among them, injection molding and dry pressing are widely used.

(1) Injection molding

The grouting molding process includes physical dehydration and chemical coagulation. Physical dewatering removes water from the slurry through the capillary action of the porous gypsum mold. The chemical setting process is because Ca2 produced by the dissolution of calcium sulfate on the surface of the gypsum mold increases the ionic strength in the slurry, resulting in flocculation of the slurry. Under the action of physical dehydration and chemical solidification, ceramic powder particles are deposited and formed on the wall of the gypsum mold.

(2) Hot die casting

Hot die casting molding is to mix ceramic powder and binder (paraffin) at a relatively high temperature (60-100°C) to obtain a slurry for hot die casting. The slurry is injected into the metal mold under the action of compressed air, cooled under pressure, and demolded to obtain a wax blank. The wax blank is dewaxed under the protection of an inert powder to obtain a biscuit, which is sintered into porcelain at high temperature. The product has good wear resistance, high hardness, high compressive strength and high density.

The center rod is widely used in motor shaft, motor shaft, grinding, needle gauge and other fields, especially the center rod made of zirconia ceramic is used in the field of heat dissipation products, replacing the traditional stainless steel center rod.