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.
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Uzalishaji wa sasa wa viwanda wa Boron carbide ni hasa kufanyika kwa njia carbothermal. Kwa mfano, unaweza kutumia njia ya kupungua kwa joto, njia za mechanochemical, synthesizing ya moja kwa moja, au sol-gel. 1. Uwe na mtazamo wa kweli Kupunguza carbothermal Njia carbothermal hutumia asidi boric na boric anhydride kupunguza joto katika tanuri ya umeme. Hii ni njia inayopendekezwa ya viwanda kuzalisha boron carbonide. Ina majibu sahili na bei ya chini. Kama malighafi, carbon nyeusi na asidi ya boreic zilitumiwa. Kwa mfano, wakati wa joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto la joto. Kwa hivyo, matokeo ya utafiti huu ni kwamba kiwango cha juu cha kiwango cha kaboni cha 20% ni sawa na kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango cha kiwango. Utaratibu huo una hasara zake. Kwa mfano, inahitaji joto la juu zaidi, ambalo laweza kutumia nishati nyingi zaidi. Pia, uzalishaji wa boron-carbidide inaweza kuwa rahisi agglomerate na inahitaji kuwa crushed. Hatimaye, bidhaa ina CO unreacted, ambayo lazima kuondolewa kwa njia ya matibabu ya baadaye. 2. Uwezekano wa kupata Kwa ajili ya uzalishaji wa boron carbonide, mchakato wa kupunguza joto ya kujienea hutumia carbon nyeusi au coke, asidi boric au boric anhydride kama malighafi na madini ya chuma (kwa kawaida mg). Joto kutoka self-propagating mwako athari za dutu chuma na self-propagating joto athari ni kutumika. Inahesabiwa kama 6mg + C + 2b2o3 = 6mG + B4C, ina faida nyingi, ikiwa ni pamoja na joto la chini la athari ya awali ya 1000-1200, matumizi ya chini ya nishati, athari za haraka, vifaa rahisi na matengenezo rahisi. B4C ni poda safi sana na ina chembe nzuri sana (0.1 hadi 4.0 mm). Haihitaji kuwa ardhi. Jiang et al. Mg, Na2O4 na C ni vifaa vya msingi. B4C poda na wastani wa ukubwa wa chembe 0.66 mm ni tayari kwa kutumia kujipanua joto kupunguza. MgO kutoka kwa athari lazima iondolewe kwa mchakato wa ziada. Hilo ni jambo gumu sana. Ili kutayarisha poda ya boron carbonide kwa mechanochemical, utahitaji kutumia poda ya graphite, poda ya boron, na poda ya magnesiamu. Inawezekana kutayarisha poda ya boron carbide kwa joto la chini kwa kutumia njia hii. Deng et al. B4C ni poda ya B2O3 iliyotengenezwa kwa kutumia utaratibu wa kemikali. Kiwango cha C: Mg kilikuwa 10: 1 Ukubwa wa chembe za unga ulikuwa kati ya 100 na 200 nm. Kwa mfano, yoghurt ina kiwango cha juu cha Mg: C cha 9: 2 hadi 10. MgO, ambayo ni bidhaa ya ziada, nyakati nyingine inaweza kuwa vigumu kuondolewa. Pia inachukua muda kwa ajili ya kusaga mpira. 4. Uwe na uhakika Ili kutengeneza boron carbonide moja kwa moja, lazima kwanza kuchanganya kaboni na boron poda pamoja na kisha kuitikia katika inert au utupu kati ya 1700 na 2100. Inawezekana kuhakikisha usafi wa juu na kudhibiti uwiano B / C katika synthesis ya moja kwa moja. Utaratibu wa kutengeneza boron carbide kwa ajili ya kutengenezwa kwake unaweza kuwa mgumu, na ni ghali. Mbinu hiyo ina mipaka yake. 5. Uwe na mtazamo mzuri. Sol-gel mbinu Sol-gel ni mbinu ambayo inorganic na chuma alkoxides ni solidified kutumia sol, gel na ufumbuzi mchakato. Mara baada ya gel imefungwa, inaweza kisha kuwa joto kutibiwa kuzalisha misombo imara. Utaratibu huu ni bora kwa sababu mchanganyiko wa malighafi na bidhaa ni sawa. Bidhaa hiyo ina muundo mkubwa, na chembe za poda za B4C zina ukubwa mdogo. Sinha et al. Bora ya boroni na asidi ya citric ni pamoja na pH ya 2 na 84,122. Unaweza kuunda gel ya dhahabu thabiti na iliyo wazi. Bora ya borate ya nyembamba ya asidi ya citric inaweza kutengenezwa kwa kupasha joto hadi digrii 700 katika tanuri. Weka kichocheo chini ya utupu kwa muda wa masaa 1000-1500 hadi masaa 2. Watafiti kutoka timu ya vifaa vya hali ya juu ya Mis-Asia walichunguza athari za joto, wakati wa athari na uwiano tofauti kwenye B4C wakati wa mfumo wa athari ya boric acid. Katika hali ya joto ya 1.5H, kaboni huru ilikuwa 2.38% baada ya kurekebisha uwiano wa msingi wa uzito wa asidi ya boroni na citric kwa 2.2.1. Hata hivyo, njia hii ya uzalishaji haina ufanisi wa juu, hivyo inaweza kuwa vigumu kupata matumizi ya kiwango kikubwa. Jukumu la boron carbonide limekuwa muhimu zaidi katika sayansi na teknolojia ya kisasa. Suluhisho linalofaa linahitajika. Boron carbide uzalishaji Hii itakuwa na jukumu muhimu katika maendeleo ya baadaye na uzalishaji wa boron carbide. 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