Silicon dioxide nano particles are known as Nano Silica, it is also called Silica Nano-Particles. It is used particularly in the Biomedical researches. This nano silica is expected to be very much stable and to have very low level of toxicity. It is also used as concrete or cement admixture with aim to improve concrete pressure strength.
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Analytical abrasives required for ground decorative stone grinding
With the development of the economy, the use of stone is more and more extensive, especially in various public places. Stone is popular with people for its graceful and luxurious posture. Its use, with the change of time, will appear aging and pollution. Such problems can be solved initially by means of cleaning, but sometimes the refurbishment must be carried out by means of grinding. The following is an introduction to abrasives and grinding tools, so that everyone has a preliminary understanding of this. First, the classification of abrasive materials: abrasive is used for grinding materials, the current classification is ordinary abrasive, super hard abrasive two categories; 1, ordinary abrasive ordinary abrasive mainly includes (1) corundum (brown corundum, white corundum, etc. The main chemical composition is Al2O3 (aluminum oxide), (2) silicon carbide (black silicon carbide, green silicon carbide), and its main chemical composition is SiC (silicon carbide). Their hardness is brown fused alumina, microhardness 2000-2200 kg / mm 2; white corundum, microhardness 2200-2300 kg / mm 2; black silicon carbide, microhardness 3100-3300 kg force / mm 2 ; Green silicon carbide, microhardness 3200-3400 kg / mm 2; particle size from 4 # - micro powder W0.5 (even finer), hardness order we can sort out the processing of granite is green silicon carbide, black carbonization Silicon, processing marble is white corundum (soft), black, green silicon carbide (hard); in view of the cost of materials, green silicon carbide, black silicon carbide, white corundum, can be made around these abrasives, inorganic Grinding tools, including diamonds, ceramics, etc.; organic grinding tools, including phenolic, unsaturated resins, and epoxy (also including abrasive cloth sandpaper), these abrasive tools constitute the grinding of ordinary abrasives tool. 2, super-hard abrasive diamond abrasive is a super-hard abrasive, although its processing history is relatively long, but as more use, it is a large number of industrial production in the past 30 years, its microhardness 8000-10000 kg force / mm 2; the hardness is the highest, the material is micro-cutting mechanism when processing materials, so it is the preferred cutting tool. In recent years, it has a large-scale increase in production and industrial cost reduction, and the processing efficiency is high (more than 5 times the ordinary). The processing effect is good (the material can be polished for very demanding materials), and thus, its application is becoming more and more extensive. Diamond grinding tools mainly include metal, resin, ceramic, etc., which are classified according to the type of bonding agent. Metal grinding tools mainly include iron-based, copper-based, and cobalt-based. It determines the processing cost of different types of materials. As a grinding tool, its particle size is used from the thickest (20#), often to the fineness of 400#. It is characterized by long service life, but the cost will be higher. Resin-based grinding tools, due to relatively low manufacturing costs, have relatively few applications. They are now used for rough grinding to polishing, which is the biggest advantage in fine-grained grinding and polishing; ceramic diamond-like grinding tools are recent Among the fastest growing tools in the year, the processing performance is long, the metal processing is long, the resin processing is short, and the technology has a good advantage. However, due to its cost, it has not been seen in the stone renovation.