Technical conditions for cryolite

[Abrasive Class] Active Filler Conducive to Grinding (Serial 3)

Pyrite (FeS2) can be used in the form of micropowder, but in the high-density coarse-grained grinding wheel formed by hot pressing, the particle size of pyrite is about 60#, which is between the abrasive size and the resin micropowder size. In the binder, the amount of addition is 50% of the volume of the micronized filler used, and the use of coarse-grained pyrite in very coarse abrasive grains is capable of accommodating a large amount of filler and also has the ability to reduce the porosity to zero.

The mixture of natural cryolite and pyrite is an excellent filler. People make it prepare high-strength rough grinding wheels. These grinding wheels do not need metal lubricants, which can cause the steel to melt or at least soften during the operation of the grinding wheel. Make the cutting process easier.

Zinc sulfide and synthetic cryolite

Cryolite is the first active filler used. Among all fillers, it has always been the most widely used filler. However, due to its resources, people began to use other materials to replace it.

The chemical name of synthetic cryolite is potassium fluoroborate, and the chemical expression is KBF4, off-white, crystalline powder, slightly soluble in water. In fact, it is more active than natural cryolite. However, the addition of potassium fluoroborate reduces the tensile strength of the resin binder. Therefore, its usage is very small. Synthetic cryolite is usually mixed with inactive fillers such as feldspar. While potassium fluoroborate is used to improve grinding performance, feldspar is used to improve the tensile strength of the binder.

Active filler zinc sulfide (ZnS) is widely used in resin bond grinding wheels for cutting steel. It can be used not only in the form of natural minerals, sphalerite, but also in the form of chemical starch, which is more active and more expensive.

Lead chloride and antimony sulfide

Lead chloride, PbCl2, white crystal, 5.85 density, melting point 501 ℃, boiling point 950 ℃, insoluble in cold water, ethanol and ether, slightly soluble in hot water.

The grinding wheels prepared with these two materials have excellent cutting performance, but due to their accumulated toxicity, producers are not only harmed in the production process of preparation, mixing, molding, etc., but also under the action of grinding heat, these materials will also volatilize and endanger the health of users.

There are many kinds of fillers and combinations. Choose the right fillers to make your products by going up one flight of stairs.

Results: Preparation and Application Technology of Nanoscale Materials

Summary of results:

Nano-scale materials have large specific surface area, small size and high activity, so they have good filling effect, reducing sintering temperature, strengthening and toughening, improving microstructure and catalytic effect and other peculiar properties. The research team used a variety of new methods to prepare nano-Al2O3, SiO2, MgAl2O4, SiC, TiC and ZrB2-SiC materials. This nanomaterial has good dispersibility, maintains a small size at high temperatures, and is used in functional refractory materials (sliding plates, nozzle, stopper, graphite crucible, etc.) and high-performance ceramic materials, which significantly improve the thermal shock resistance, erosion resistance and oxidation resistance of the material, and has obtained a number of patents.