(Abstract) Diamond superhard tools play an important role in stone processing. The annual output value of sawing tools accounts for 60%-70% of the total output value of superhard products. Its performance quality directly affects the quality, cost and stone of stone processing. Utilization of blocks. The sawing tools are mainly divided into granite saw blades and marble saw blades. Among them, marble has beautiful color and fine texture. It has been popular in the architectural decoration industry for more than ten years. It has a huge demand in the domestic market and consumes a large number of marble saw blades every year. .
In order to improve the yield of marble blocks, the marble sawing tools require small kerf width, high sharpness and good self-sharpness. Good sawing quality can reduce machining allowance, reduce loss and ultimately increase the yield. The marble saw blade bears huge impact load during the sawing process. The diamond particles, the carcass and the marble are strongly worn between each other. At present, the marble saw blades in China generally have the advantages of poor sharpness, low carcass strength and poor durability. problem. Studying the stability of the carcass, the synchronous wear and the good control of the diamond have practical engineering significance for the performance improvement of the marble saw blade.
The marble saw blade carcass usually uses a copper-tin formula system, which has strong bond strength, good wear resistance, low sintering temperature, and widely used copper-tin pre-alloyed powders such as CuSn10, CuSn15 and CuSn20. The copper-tin prealloyed powder forms α-solid solution and (α+δ) eutectoid during the sintering process, and the carcass is hard and brittle and not sticky, which has a certain improvement on the self-sharpness of the carcass. High tin prealloyed powder is easier to achieve liquid phase sintering during sintering, and can produce δ, ε brittle phase. Even when the tin mass fraction exceeds 40%, the carcass generates η hard and brittle phase, which can improve the diamond tool matrix synchronization or Leading wear and tear, it has a significant effect on sharpness.
At present, there are few studies on high tin prealloyed powders in China, especially for elemental reinforced copper tin prealloyed powders. Adding a small amount of silver to the copper-tin alloy makes it easy to adjust the solid phase line of the alloy liquid, improving mechanical properties and stability. In this study, a silver-based high-tin prealloyed powder was prepared by gas-water tight coupling atomization method, and the alloy powder was added to the formula to replace the elemental tin powder in the original formula, and the corresponding nuclear reduction copper powder was finally used for improvement. The carcass performance of marble saw blades is hopeful for the industry.
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Disinfection efficacy testing is usually done with planktonic cells or more recently, biofilms. While disinfectants are much less effective against biofilms compared to planktonic cells, questions regarding the disinfection tolerance of detached biofilm clusters remain largely unanswered. Burkholderia cepacia and Pseudomonas aeruginosa were grown in chemostats and biofilm tubing reactors, with the tubing reactor serving as a source of detached biofilm clusters. Chlorine dioxide susceptibility was assessed for B. cepacia and P. aeruginosa in these three sample types as monocultures and binary cultures. Similar doses of chlorine dioxide inactivated samples of chemostat and tubing reactor effluent and no statistically significant difference between the log(10) reductions was found. This contrasts with chlorine, shown previously to be generally less effective against detached biofilm particles. Biofilms were more tolerant and required chlorine dioxide doses ten times higher than chemostat and tubing reactor effluent samples. A second species was advantageous in all sample types and resulted in lower log(10) reductions when compared to the single species cultures, suggesting a beneficial interaction of the species.
Agriculture Industry Disinfection
Chlorine Dioxide For Aquaculture, Chlorine Dioxide For Poultry, Fish Water Disinfection, Chlorine Dioxide Farm Disinfection
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