Ammonium metatungstate dispersion has various effects on the properties of ceramic materials, which can be summarized from the following aspects:
- Improvement of hardness and wear resistance of ceramic materials
Enhancement effect
As an inorganic compound, ammonium metatungstate contains tungsten in its decomposition product, and tungsten is a well-known hard metal. Therefore, by adding ammonium metatungstate dispersion to ceramic materials, compounds containing tungsten or tungsten metal particles can be formed after appropriate heat treatment, thus significantly improving the hardness and wear resistance of ceramic materials.
Specific applications
For example, the W coating prepared by ammonium metatungstate coated on the surface of porous SiC ceramics can form a more uniform coating layer with uniform and fine particles, which helps to improve the overall hardness and wear resistance of ceramic materials.
- Regulating the color and gloss of ceramic materials
Color regulation
Although ammonium metatungstate itself does not directly give color to ceramic materials, its decomposition products in the ceramic preparation process may react with other components in the ceramic matrix to generate compounds with specific colors, thus regulating the color of ceramic materials.
Gloss enhancement
The addition of ammonium metatungstate may improve the microstructure of the ceramic surface, making it smoother and denser, thus enhancing the gloss of the ceramic material.
- Lowering the sintering temperature of ceramic materials
Promote sintering
Substances produced by the decomposition of ammonium metatungstate at high temperatures may be used as sintering aids to promote the bonding and densification process between ceramic particles, thus lowering the sintering temperature of ceramic materials.
Energy savings
Lower sintering temperatures mean less energy consumption during ceramic production, which contributes to lower production costs and environmental impact.
- Influence on the microstructure and properties of ceramic materials
Grain refinement
Ammonium metatungstate may play the role of grain refiner in the sintering process of ceramics, which can make the microstructure of ceramic materials more uniform and fine by inhibiting the abnormal growth of grains, thus improving their mechanical properties and thermal stability.
Change of phase composition
The addition of ammonium metatungstate may also change the phase composition of the ceramic material, generate new phases or change the proportion of the original phases, thus affecting the overall performance of the ceramic material.
- Cautions
Dispersing effect
The dispersion effect of ammonium metatungstate dispersion has an important influence on the performance of ceramic materials. If the dispersion is not homogeneous, it may lead to defects within the ceramic material or uneven properties.
Addition Control
The amount of ammonium metatungstate added needs to be strictly controlled, too much or too little may adversely affect the performance of ceramic materials. For example, the addition of ammonium metatungstate in black ceramic pigment can lower the firing temperature and reduce the amount of expensive cobalt oxide, but the addition of too much may lead to grayish and light color pigment.
In summary, ammonium metatungstate dispersion has various effects on the performance of ceramic materials, including improving hardness and wear resistance, adjusting color and gloss, lowering the sintering temperature, and affecting the microstructure and properties. However, the specific degree and mechanism of these effects may vary depending on the type of ceramic material and the preparation process. Therefore, they need to be selected and adjusted according to the specific situation in practical applications.
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