Textile Zirconia Ceramic Parts

Zirconia, also known as zirconium dioxide (ZrO2), is an inorganic non-metallic material with high temperature resistance, corrosion resistance, wear resistance and excellent electrical conductivity. In addition to its traditional application in refractory materials and ceramic pigments, ZrO2 is also used in In high-tech fields such as electronic ceramics, functional ceramics and structural ceramics.

Zhongwei Precision is committed to providing domestic and foreign customers with advanced Textile Zirconia Ceramic Parts with high strength, high toughness, wear resistance, corrosion resistance and high temperature resistance. technology companies. With a variety of modern high-precision equipment, it has independently realized the completion of the entire production process of ceramic parts from ceramic powder preparation, green body molding, high temperature sintering to ceramic material finishing.

Product Description

1. Implementation standards: the company strictly implements ISO9001 certification, and the products have passed ROHS, FDA EU certification, etc.

2. Product material standards: ISO, GB, ASTM, SAE, EN, DIN, BS, AMS, JIS, ASME, DMS, TOCT, GB

3. Main processes: grouting, injection molding, tape casting, isostatic pressing, 3D printing

4. Available materials for ceramics:

It mainly produces finished ceramic rods, ceramic tubes, ceramic rings, ceramic plates, ceramic suction cups, ceramic blades and other special-shaped ceramic structures. The main ceramic materials are alumina, zirconia, silicon carbide, silicon nitride, and aluminum nitride ceramics. High temperature resistance, wear resistance, corrosion resistance, acid and alkali resistance, anti-magnetic, pressure resistance. And 3D printing, etc. are customized according to customer requirements.

Combined tube, its high wear resistance effectively resists material wear and impact.

Product Properties and Preparation Methods

1. Physical properties

Zirconium dioxide has excellent properties such as high melting point and boiling point, high hardness, insulator at room temperature, and electrical conductivity at high temperature.

Zirconium dioxide has three crystal forms, which are oxides of polycrystalline phase transformation. The stable low-temperature phase is monoclinic (m-ZrO2), and the tetragonal phase (t-ZrO2) is gradually formed when the temperature is higher than 1000 °C, and only the tetragonal crystal phase exists until 2370 °C. Crystalline phase (c-ZrO2). ZrO2 shrinks in volume during heating and expands during cooling. Therefore, in order to prevent the volume change during use, the crystal form must be stabilized. Commonly used stabilizers are Y2O3, CaO, MgO, CeO2 and other rare earth oxides. The cation radii of these oxides are similar to those of Zr4+ (within 12% difference), and they have great solubility in ZrO2, and can form substitutional solid solutions of monoclinic, tetragonal and cubic crystal forms with ZrO2. This solid solution can be maintained at room temperature in a metastable state by avoiding eutectoid decomposition by rapid cooling. The cubic solid solution obtained by rapid cooling remains stable, no phase transition occurs, and no volume change occurs. This ZrO2 is called fully stable ZrO2, written as FSZ. Based on the characteristic conditions of ZrO2 crystal transformation and the effect of different types of stabilizers, the effective addition amount (molar fraction) of stabilizers Y2O3, CaO, MgO and CeO2 are usually 7%-14%, 15%-29%, 16%, respectively. ~26%, >13%. According to different application conditions, the stabilizer can be used alone or mixed to obtain ZrO2 products with different properties.

2. Chemical properties of ZrO2

Zirconia has good chemical properties. It is a weakly acidic oxide with sufficient stability to alkaline solutions and many acidic solutions (except hot concentrated H2SO4, HF and H3PO4). Crucibles made of ZrO2 can smelt a variety of metals such as potassium, sodium, aluminum and iron. It is also stable to sulfides, phosphides, etc. Many silicide melts and slag are also ineffective for sintering ZrO2.

Molten alkali silicates and molten silicates containing alkaline earth metals have an erosive effect on sintered ZrO2 at high temperatures. The strong base reacts with ZrO2 at high temperature to form the corresponding zirconate. In the vacuum at high temperature (above 2220℃), ZrO2 reacts with carbon to form ZrC, and reacts with hydrogen or nitrogen to form the corresponding hydride or nitride.

3. Preparation method

Preparation method of zirconia powder:

(1) Co-precipitation method

The co-precipitation method has become the most commonly used method for the preparation of nano-zirconia due to its simple operation, easy control of the reaction process and low cost. The specific process of the method is: adding part of stabilizers (such as Y(NO3)3) and dispersing agents (such as PEG2000, etc.), and soluble zirconium salts (ZrOCl2?8H2O, ZrCl4 or Zr(NO3)4, etc.) are made into salts solution, gradually add precipitating agent (such as NH3?H2O, NaOH, H2NCONH2) to the salt solution, and control the pH value reasonably, zirconium hydroxide gel and yttrium hydroxide gel are precipitated by reaction precipitation, and then aged , filtration, water washing, alcohol washing, drying, calcination and other processes, so as to obtain zirconia powder.

(2) Hydrothermal method

The specific process of the hydrothermal method is: mix soluble zirconium salts (such as ZrOCl2?8H2O, ZrCl4, etc.) with ammonia water, control the pH value of the solution, and obtain zirconium hydroxide gel through the reaction, which is filtered, washed, and dried to obtain For the hydrothermal precursor, the distilled water and the hydrothermal precursor are mixed, the hydrothermal conditions are controlled to obtain the hydrothermal product, and the ZrO2 powder is obtained by filtering, washing and drying.

(3) Microemulsion method

The specific process of the microemulsion method is as follows: the aqueous solution of ZrOCl2-8H2O and Y(NO3)3 is mixed with ammonia water and a mixture of cetyltrimethylammonium bromide and n-ethanol respectively to form a reverse micelle solution, and then the reverse micellar solution is formed. The micelle solution is mixed, and then stirred, reacted, precipitated, filtered, washed, dried and calcined to obtain zirconia powder.

(4) Electrofusion method

The preparation of zirconia powder by fusion method has become an effective method for preparing zirconia due to its simple process, low pollution and low cost. At present, the main process of preparing zirconia by electrofusion method is: combining zirconium-containing ores (such as zircon sand, etc.), carbon-containing substances (such as graphite, coke, etc.), stabilizers (yttrium oxide, calcium oxide, etc.), clarifying agent (iron, alumina, etc.) are mixed evenly, and then smelted in an electric furnace, melted into a liquid phase at a high temperature of an electric arc furnace, cooled, and crushed in the later stage to obtain zirconia powder.

(5) Others

There are some other methods also used for the preparation of zirconia powder. such as the sol-gel method.

Process After Sintering

Processing equipment: equipped with CNC engraving machine, centerless grinding, internal and external cylindrical grinding, surface grinding, CNC lathe machining center, wire cutting, turning, milling, grinding and other high-precision production and testing equipment.

Moulds and Inspection Fixtures

1. Mold service life: usually semi-permanent. (except for lost foam).

2. Mold delivery time: 10-25 days, (according to product structure and product size).

3. Tooling and mold maintenance: Zhongwei is responsible for precision parts.

Quality Control

1. Quality control: the defective rate is less than 0.1%.

2. Samples and trial run will be 100% inspected during production and before shipment, sample inspection for mass production according to ISDO standards or customer requirements.

3. Test equipment: roundness measuring instrument, three-coordinate measuring instrument, image coordinate measuring instrument, Hexagon three-coordinate measuring instrument, image measuring instrument, density measuring instrument, smoothness measuring instrument, micro Vickers hardness tester.

Application

1. Zirconia structural ceramics

(1) Zirconia ceramic bearings

Zirconia full ceramic bearings have the characteristics of anti-magnetic and electrical insulation, wear resistance, corrosion resistance, oil-free self-lubrication, high temperature resistance, high cold resistance, etc., and can be used in extremely harsh environments and special working conditions.

(2) Zirconia ceramic valve

Zirconia ceramic valve has excellent wear resistance, corrosion resistance and high temperature thermal shock resistance, which can be competent in this field.

(3) Zirconia abrasives

Zirconia grinding balls have high hardness, low wear rate, long service life, can greatly reduce the pollution of grinding raw materials, and can ensure the quality of products. Improve the grinding and dispersing efficiency, which can effectively shorten the grinding time.

2. Zirconia functional ceramics

(1) Zirconia ceramic balls for ballpoint pens

(2) Zirconia ceramic tool

Zirconia ceramic knives have the characteristics of high strength, wear resistance, no oxidation, no rust, acid and alkali resistance, anti-static, and no reaction with food. Knives, the main products in the current market are: zirconia ceramic table knives, scissors, razors, scalpels, etc. In recent years, they have become popular in Europe, the United States, Japan, South Korea and other places.

(3) Zirconia high temperature heating material

Zirconia is an insulating material at room temperature, with a specific resistance of up to 1015Ω?cm. It can conduct electricity when the temperature rises to 600℃, and it is a good conductor when it is above 1000℃. It can be used as a high temperature heating element of 1800℃, and the maximum working temperature can reach 2400℃ , has been successfully used in heating elements and their equipment in an oxidizing atmosphere above 2000 ℃, and the electrode materials of magnetic fluid power generation are also under active research.

(4) Zirconia bioceramic materials

Since there is no metal inner crown, the zirconia porcelain teeth have good tooth transparency and excellent gloss, which can effectively avoid problems such as tooth sensitivity and black gum lines. The dental beauty needs of patients, and the strength and toughness of zirconia material make up for the shortcoming of ordinary porcelain teeth that are prone to slipping. It has good biocompatibility, does not stimulate oral mucosal tissue, and is easy to clean. It is currently the best quality porcelain teeth at home and abroad. .

(5) Zirconia coating material

High-performance Y2O3 and other stabilizer-stabilized zirconia thermal barrier ceramic coating materials are mainly used in high-performance turbo aircraft engines.

(6) Zirconia communication material

In the ceramic PC type optical fiber active connector, the zirconia pin body is its key component.

(7) Zirconia oxygen sensor

3. Zirconia decorative material

(1) Zirconia gemstone material

Zirconia gem materials are divided into natural cubic zirconia and synthetic cubic zirconia. Natural cubic zirconia is extremely difficult to find in the natural state, which determines its rarity as a gem material. The natural cubic zirconia is very rich in color, and the price of large and high-quality natural zirconia is never below the same diamond. , is a very rare precious natural gemstone. Synthetic cubic zirconia has good optical properties and is a cheap and beautiful alternative to diamonds.

(2) Zirconia ceramic jewelry

There are mainly the following types of zirconia ceramic jewelry:

①Silver jewelry inlaid with zirconia, where the range of zirconia is relatively wide, including zirconia, industrial zirconia, high-purity zirconia, stabilized zirconia, ultra-fine zirconia, zircon sand , zircon powder, etc., silver rhodium-plated jewelry with cubic zirconia is especially favored by European customers.

② pure zirconia material to wear jewelry.

③ The accessories with both application functions, typical products are ceramic watch cases, bezels, straps and other products.

4. Other applications of zirconia

(1) Form a composite material with zirconia

The multi-phase material formed by compounding with other materials, such as the multi-phase material formed by zirconia, alumina, mullite and other materials, has obtained a new material with better performance than the single-phase material.

(2) Ordinary ceramic additives

Application of ceramic color glaze: zirconia is a good color aid for yellow-green pigments. If you want to obtain vanadium zirconium yellow pigments with better performance, you must choose pure zirconia. Zirconium can improve the high temperature viscosity of the glaze and expand the temperature range of high temperature viscosity change, and has good thermal stability. When its content is 2% to 3%, it can improve the anti-cracking performance of the glaze. It is inert and can improve the chemical stability of the glaze and the ability to resist acid and alkali erosion, and is sometimes used to make opalescent glazes.

(3) Preparation of chromate raw materials

The raw materials for the preparation of zirconate are produced by the reaction of zirconium dioxide and some metal oxides or metal carbonates. They are all macromolecular structures with various electrical properties and are used in high temperature, electronic components and other fields.

(4) Textile Zirconia Ceramic Parts