Processing Technology of Zirconia Ceramics

Electrofusion zirconia has many advantages, such as high mechanical properties, chemical inertness, high-temperature stability, corrosion resistance, etc. Therefore, it is widely used in various industries and fields, and has a wide range of applications, especially as a refractory material, which is favored by many industries. The application fields of electrofusion zirconia mainly include medical products, pigments, electronic products, coatings, ceramics, etc. Its main uses include ceramic nozzles in the ceramic industry, coatings for jet engine components, production of silica glass, bridges, dental crowns, feldspar ceramic veneers, dentures, imitation diamonds, and other uses. Below, Qingdao Sailao will give you a detailed introduction.

1. High temperature wear-resistant ceramics

Continuous cast steel refractory materials, especially isobaric products. These products include discharge ports and immersion nozzles for intermediate flow channels and steel ladles. Sliding baffles also require the use of zirconia, especially for central areas exposed to higher temperatures. The mechanical strength and resistance of zirconia make it a suitable component for ceramic manufacturing. This includes ceramic knives, which are much harder than steel forks due to the high hardness coefficient of zirconia.

2. High heat resistance silica glass

Used for the production of fused alumina zirconia silica (AZS) refractory materials in the glass industry. Zirconia provides materials with excellent resistance to high temperatures and corrosion of molten glass. Due to its high heat resistance, zirconia is used as a component in crucibles, furnaces, and other high-temperature environments. In addition, zirconia improves the fire resistance of ceramics. Refractory bricks and armor plates are examples of refractory materials based on zirconia. In addition, adding zirconia to molten quartz can be used to produce silica glass, which is stronger and more stress resistant than opaque quartz glass. Zirconia can also be added to alumina for use in components of steel casting processes.

3. Insulation coating

In the ceramic industry, the production of sanitary ceramics, tableware, floor tiles, and wall tiles all require colored glaze, which can withstand high-temperature roasting processing. Zirconia is used to prepare pigments such as praseodymium yellow, vanadium blue, and iron coral powder. Diagonal zircon is also used to make ceramic pigments. Zirconia is used as a coating for jet engine components exposed to high temperatures. The low thermal conductivity and high heat resistance of this compound make it possible. Research has confirmed the effectiveness of zirconia for TBC as long as the material is applied correctly and evenly.

4. False teeth

Due to its biocompatibility, good aesthetics, and high mechanical properties, zirconia is one of the popular uses in the dental field, mainly used for bridge, crown, feldspar ceramic veneer, and dental restoration of dentures. Yttrium stabilized zirconia can also be used to produce near permanent zirconia crowns.

Processing Technology and Precautions for Zirconia Ceramics

Zirconia ceramics are prone to failure before undergoing chemical heat treatment. Only after chemical heat treatment can their properties become more stable and prevent cracking under the influence of high temperatures, enhancing their compressive strength. The raw material of zirconia ceramics is ZrO2, which adopts ceramic material forming technology. Moreover, dry compression molding technology not only greatly reduces the production cost of ceramic products, but also improves the reliability of ceramic material application and the recyclability of production, saving a lot of costs.

1、 Processing Technology of Zirconia Ceramics

1. The dry pressing forming technology of zirconia ceramics includes three aspects: fine ceramic preparation process, forming process, and sintering process. Moreover, powder preparation, forming, and sintering are interrelated, mutually constrained, and complementary, which greatly improves the dry pressing forming technology and is used by various industries. From the current development level of this technology, it plays a connecting role in the entire preparation process of ceramic materials, This can ensure the degree of use and quality of the performance of ceramic materials and components.

2. Dry compression molding technology uses external physical pressure to compress ceramic powder into a solid shape, making zirconia ceramics durable and durable. In terms of the advantages of dry pressing forming, it produces accurate body dimensions, strict manufacturing requirements, and this technology has simple production operations, which can fully achieve mechanized operations, in line with the convenience of modern technology production. It adopts dry method operation, avoiding the problem of high moisture content and difficulty in drying in traditional wet process. It is mainly used to shape simple shaped ceramic products and can be widely used.

2、 Precautions in processing zirconia ceramics

1. One problem with zirconia ceramic processing is the high cost of cutting tools. Cutting requires the use of expensive sintered diamond and CBN tools, and precision machining also relies mainly on diamond grinding wheels. Therefore, the cost of cutting tools is tens to hundreds of times higher than that of metal cutting tools. The strength of zirconia ceramics is sensitive to processing conditions, making it difficult to achieve efficient processing. Therefore, the processing cost of zirconia ceramics is much higher than that of ordinary materials.

2. According to the different situations of zirconia ceramics, the sintered body can also be directly ground and processed without processing to achieve design accuracy. In terms of machining process, zirconia ceramics are almost similar to metal parts, but the machining allowance of zirconia ceramics is much larger. During rough machining of unburned or roasted ceramics, it is easy to encounter problems such as insufficient strength or surface processing defects, or inability to obtain the required machining shape due to insufficient clamping. Due to the inability to maintain uniform shrinkage during sintering, the size should not be too close to the size during rough machining, resulting in a large margin for precision machining. For metal processing, if the allowance for precision machining considers the black skin generated by thermal deformation and heat treatment, a few millimeters should be left as much as possible. For ceramic processing, the finishing allowance needs to be a few millimeters or even more. Large processing allowance, reduced productivity, and increased production costs.

3、 Example: Ceramic shot peening

1. In the application of shot peening machines, the nozzle itself will generate pressure, and in subsequent applications, ceramic shot peening will also generate a certain rebound due to surface impact. Therefore, when applying ceramic shot peening, it is more necessary to provide protection to improve personal security, and ensure that protective goggles and a series of protective products can be worn in a timely manner before the application of ceramic shot peening to ensure the effectiveness of the ceramic shot peening process, Maintain better security;

2. Before carrying out reinforcement processing, it is even more necessary to clean the surface of the raw materials. A series of regulations such as repair and polishing are used to make the surface smoother, in order to achieve better surface reinforcement technology through subsequent ceramic spraying. Therefore, customers need to appreciate the original quality and actual cleaning ability of the surface before using this ceramic spraying to achieve surface treatment, Ensure that the shot peening can be installed within the appropriate range in order to effectively spray at its correct angle.