Five Important Methods of Boron Carbide Production
Boron carbide, which has exceptional properties, is widely utilized. Boron carbide ranks second in hardness to both cubic boron and diamond. This material has many great advantages including high melting points, low densities, high strength and broad neutron absorption crosses-sections. They also have excellent thermoelectric performances. You can also use it for aerospace, nuclear energy and national defense.
Current industrial production of Boron carbide is mainly done by the carbothermal method. Other than that, there are also the methods of
boron carbide production
You can use self-propagating heat reduction, mechanochemical methods, direct synthesizing, or sol-gel to do so.
1. Carbothermal reduction
The carbothermal method uses boric acid and boric anhydride to reduce the temperature in an electric oven. This is the preferred method to industrially produce boron carbonide. It has simple responses and low prices.
As raw materials, carbon black and boreic acid were used. They were kept at 1800-1850 for 0.5-1 h. Once the powder was ready to be calcined, it was highly pure boron caride. This result was within the theoretical limit of 20% carbon. This process has its disadvantages. For example, it requires higher temperatures, which can consume a lot more energy. Also, the boron-carbidide production can be easy to agglomerate and needs to have been crushed. Finally, the product contains unreacted CO, which must be removed through subsequent treatment.
2. Thermo-propagating self-propagating thermal loss
For the production of boron carbonide, the self-propagating heat reduction process uses carbon black or coke, boric acid or boric anhydride as raw materials and active metal substance (usually mg). The heat from self-propagating combustion reactions of metal substance and the self-propagating heating reaction is used. It is calculated as 6mg+C + 2b2o3= 6mgo+B4C
It has many advantages, including a lower initial reaction temperature of 1000-1200, low energy consumption, fast reactions, simple equipment and easy maintenance. B4C powder is very pure and has excellent particles (0.1 to 4.0 m.m.) It doesn't need to be ground.
Jiang et.al. used Mg, Na2B4O7 and C as raw material. B4C powder with an average particle size of 0.66 m.m was prepared using self-propagating heat reduction. The MgO from the reaction has to be eliminated by an additional process. This is very difficult.
To prepare boron carbonide powder by mechanochemical, you will need to use graphite powder, boron powder, and magnesium powder. It is possible to prepare boron carbide powder at a lower temperature using this method.
Deng et al. B4C powder with B2O3 prepared using the mechanochemical procedure. The C:Mg mass ratio was 10:1;11. Powder particle sizes ranged between 100 and 200 nm. Yogurt and colleagues found the 9:2-10:1 best Mg:C ratio. MgO, a by-product, can sometimes be hard to get rid of. It also takes time for ball milling.
4. Direct Synthesis
To make boron carbonide directly, you must first mix the carbon and boron powder together and then react in an inert or vacuum of between 1700 to 2100. It is possible to ensure high purity and control the ratio B / C in direct synthesis. The process of making boron carbide for its synthesis can be complex, and it is expensive. This technique has its limits.
5. Sol-gel method
Sol-gel is the method by which inorganic and metal alkoxides are solidified using the sol, gel and solution process. Once the gel has been solidified, it can then be heat treated to produce stable compounds. This process is superior because the mix of raw materials and product are uniform. The reaction temperature is lower, the product has a bulky texture, and B4C powder particles have a small size.
Sinha et al. The boric acid was mixed with the citric acid in pH=2-3, 84-122. You can form stable and transparent gold gel. You can obtain the porous precursor of soft borate citric acids by heating it to 700 degrees in an oven. Keep the precursor under vacuum for between 1000-1450 and 2 hours. You will be able to obtain B4C powder of approximately 2.25 M.
Researchers from Mis-asia's advanced materials team examined the impact of temperature, reaction time and different ratios on B4C during the boric acid citric Acid gel reaction system. At 1500 3.5H, the free carbon was 2.38 percent after adjusting the initial mass ratio of boric and citric acids to 2.2:1. However, this production method doesn't have a high efficiency, so it can be difficult to obtain large-scale uses.
The role of boron carbonide has become more important in modern science and technology. A suitable solution is required.
boron carbide production
This will play a crucial role in the future development and production of boron carbonide.
Mis-asia advanced Material Tech Co., Ltd. is a leading manufacturer of Boron Carbide powder with more than 12 years' experience in chemical product research and development. High quality products are what you want.
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