1. Ukubunjwa kweMichiza kunye neMicimbi yeZakhiwo zeBoron Carbide Powder
1.1 I-B ₄ C Stoichiometry kunye ne-Atomic Architecture
(Boron Carbide)
I-Boron carbide (B ₄ C) umgubo yinto engeyo-oxide yeceramic equlunqwe kakhulu yi-boron kunye ne-athomu zekhabhoni, ngefomula yestoichiometric egqibeleleyo B EZINE C, nangona ibonisa uluhlu olukhulu lonyamezelo lokuqamba ukusuka malunga ne-B FOUR C ukuya ku-B ₁₀. ₅ C.
Isakhiwo sayo se-crystal sivela kwinkqubo ye-rhombohedral, ichongwe ngothungelwano lwe-12-atom icosahedra– nganye iquka 11 iiathom zebhoron kunye 1 athom yekhabhoni– idityaniswe nguB straight– C okanye C– B– C ngqo amatyathanga triatomic ecaleni [111] ulwalathiso.
Eli lungiselelo lahlukileyo le-icosahedra ebotshelelwe ngokudibeneyo kunye namatyathanga okudibanisa adlulisa ukuqina okugqwesileyo kunye nokuzinza kwe-thermal., ukwenza i-boron carbide enye yezona mveliso zinzima kakhulu ezaziwayo, idlulwe kuphela yi-cubic boron nitride kunye nedayimane.
Ubukho bemiba yoyilo, njengokunqongophala kwekhabhoni kwikhonkco elithe tye okanye imeko yokutshintsha ngaphakathi kwe-icosahedra, ichaphazela kakhulu oomatshini, idijithali, kunye namakhaya okufunxa ineutron, ukufuna ulawulo oluthile ngexesha lokwenziwa komgubo.
Ezi mpawu zomgangatho we-atom nazo zongeza kubuninzi bayo obuphantsi (~ 2.52 g/cm EZINE), eyimfuneko kwizicelo zekhaka ezikhaphukhaphu apho umlinganiselo wokuqina ukuya kobunzima ubalulekile.
1.2 Ukucoceka kweqonga kunye neziphumo ezingcolisayo
Izicelo ezisebenza kakhulu zifuna i-boron carbide powders kunye nenqanaba eliphezulu lokucoceka kunye nokungcoliswa komda ovela kwi-oxygen., ukungcoliseka metallic, okanye izigaba zesibini ezifana ne-boron suboxides (B ZIMBINI O ₂) okanye ikhabhoni yasimahla.
Ukungcola kweoksijini, idla ngokunikezelwa kulo lonke ukuphatha okanye kwimathiriyeli ekrwada, bangaphuhlisa B ZIMBINI O zibini kwimida edla ngokutya okuziinkozo, eguqukayo kumaqondo obushushu aphezulu kwaye idale i-porosity kuyo yonke i-sintering, ukuwohloka kakhulu ukunyaniseka koomatshini.
Ukungcola kwentsimbi okufana nentsimbi okanye isilicon inokusebenza njengezinto ezincedayo, ukanti inokwenza i-eutectics enyibilikayo ephantsi okanye amanqanaba esibini abeke esichengeni ubulukhuni kunye nokuzinza kwe-thermal..
Ngenxa yoko, izicwangciso zokuhluza ezifana nokuvuza kweasidi, ubushushu obuphezulu be-annealing phantsi kweemeko ezingqongileyo, okanye ukusetyenziswa kwe-ultra-pure forerunners kubalulekile ukwenza umgubo olungele iiseramics ezinobunkunkqele.
Ukwabiwa kobungakanani bentwana kunye nendawo ethile yomgubo ikwadlala indima ebalulekileyo ekucingeni ukuba sinterability kunye ne-microstructure yokugqibela., kunye ne-submicron powders ngokuqhelekileyo eyenza uxinaniso olukhulu kumaqondo asezantsi obushushu.
2. Ukwenziwa kunye nokuLungiswa kweBoron Carbide Powder
(Boron Carbide)
2.1 IiNdlela zokuVeliswa koShishino kunye neLebhu
I-Boron carbide powder iveliswa kakhulu ngobushushu obuphezulu be-carbothermal yehla ye-boron equlathe izandulela., ezininzi eziqhelekileyo ze-boric acid (H EZINHLANU BO ₃) okanye i-boron oxide (B ₂ O EZINHLANU), ukusebenzisa imithombo yekhabhoni efana necoke yeoli okanye ilahle.
Indlela abasabela ngayo, ngokuqhelekileyo kwenziwa kwiinkqubo zokufudumeza i-arc yombane kumanqanaba obushushu phakathi 1800 ° C kunye 2500 °C, iyaqhubeka njengoko: 2B ₂ O EZINTATHU + 7C → B ₄ C + 6CO.
Obu buchule buvelisa ubukrwada, Umgubo omile ngokungalungelelananga odinga ukuguba okubalulekileyo kunye nokuhlelwa ukuze kufezekiswe ubukhulu beqhekeza obufunekayo kulawulo oluphucukileyo lweceramic..
Iindlela ezizezinye ezifana ne-laser-induced chemical vapor deposition (CVD), i-plasma-assisted synthesis, kunye neendlela zokuphathwa kwe-mechanochemical ukuya kuphuculo, uninzi lweepowders ezilinganayo ezinolawulo olungcono kakhulu kwi-stoichiometry kunye ne-morphology.
I-Mechanochemical synthesis, njengokuba, ibandakanya i-eneji ephezulu yokugaya i-boron kunye nekhabhoni ebalulekileyo, ukuvumela ubushushu begumbi okanye ubushushu obuphantsi be-B ₄ C ngeempendulo eziqinileyo eziqhutywa ngamandla.
Ezi ndlela eziphambili, ngelixa zibiza kakhulu, bafumana ireyithi yenzala yokuvelisa i-nanostructured powders kunye ne-sinterability ephuculweyo kunye nokusebenza okubonakalayo.
2.2 I-Powder Morphology kunye noYilo lweNdawo yoMphezulu
I-morphology ye-boron carbide powder– nokuba i-angular, ngqukuva, okanye i-nanostructured– ngqo kuchaphazela ukuhamba kwayo, ukupakisha ukuxinana, kunye nokuphinda kusebenze kulo lonke ixesha lokudityaniswa kwemali mboleko.
Amasuntswana e-Angular, eqhelekileyo yomgubo ocoliweyo kunye nomatshini owenziwe ngumgubo, zihlala zithande ukuhlangana, ukuqinisa amandla alungele ukuphilisana kwendalo kanti kusenokubonisa amathambeka axineneyo.
Imiqulu engqukuva, edla ngokukhutshwa ngokutshiza ngokumisa okanye i-plasma spheroidization, bonelela ngeempawu zokujikeleziswa kweprimiyamu yokwenziwa kokongeza kunye noxinzelelo olushushu.
Ukuguqulwa komphezulu, ebandakanya ukugqiba ngekhabhoni okanye i-polymer dispersants, inokwandisa ukusasazwa komgubo kwi-slurries kunye nokuyeka imfumba, eyona nto ibalulekileyo ekufezekiseni i-microstructures efanayo kumacandelo e-sintered.
Ngaphaya koko, unyango pre-sintering ezifana annealing kwi-inert okanye ukunciphisa bume bunceda ukuphelisa umphezulu oxides kunye neentlobo adsorbed, ukuphucula i-sinterability kunye nokuvuleka kokugqibela okanye amandla omatshini.
3. Iimpawu eziSebenzayo kunye neeMetrics zokuSebenza
3.1 Imikhwa yeMechanical kunye neThermal
Boron carbide powder, xa zidityaniswe ngqo kwiiseramikhi ezininzi, ubonisa iipropati ezibalaseleyo zokuhlala ezinomatshini, ebandakanya ukuqina kweVickers kwe30– 35 Inqaku eliphakathi, ukuyenza enye yezona zinto zinzima zobunjineli ezibonelelwayo.
Amandla ayo acinezelayo adlulela ngaphaya 4 GPA, kwaye igcina ukunyaniseka kwesakhiwo kumaqondo obushushu ukuya kuthi ga 1500 ° C kwindawo engasebenziyo, Nangona i-oxidation iba yinto eninzi 500 ° C emoyeni ngenxa B ₂ O ezintlanu kwakheka.
Imveliso iyancipha ukuxinana (~ 2.5 g/cm ³) inika umlinganiselo obalaseleyo wamandla ukuya kubunzima, inzuzo ebalulekileyo kwi-aerospace kunye ne-ballistic security systems.
Nangona kunjalo, I-boron carbide ngokwemvelo i-brittle kwaye isengozini kwi-amorphization phantsi kweempembelelo zoxinzelelo oluphezulu, into eyaziwa ngokuba “ukulahlekelwa ngamandla okucheba,” ethintela ukusebenza kwayo ngokukodwa kwimiba yesikrweqe ebandakanya iiprojekti zesantya esiphezulu.
Phanda ilungelo kuphuhliso oludityanisiweyo– njengokudibanisa i-B ₄ C kunye ne-silicon carbide (SiC) okanye i-carbon fibers– ijolise ekucutheni olu luthintelo ngokomeleza ukuqina kokuqhekeka kunye nokuchithwa kwamandla.
3.2 Ukufunxwa kweNeutron kunye nosetyenziso lweNyukliya
Phakathi kolona phawu lubalulekileyo lwe-boron carbide kukufunxa kwayo kwi-neutron ephezulu yecandelo., ikakhulu ngenxa ye ¹⁰ B isotope, ehamba nge ¹⁰ B(n, a)Zisixhenxe iimpendulo zenyukliya zeLi ekuthathweni kweneutron.
Eli khaya lenza umgubo we-B ₄ C ube yimveliso egqibeleleyo yokhuselo lwe-neutron, iinduku zokulawula, kunye neepeliti zokuvala kwizixhobo zenyukliya, apho ithatha ngokufanelekileyo iinyutroni ezingaphezulu ukulawula iimpendulo ze-fission.
Iziphumo ze-alpha fragments kunye ne-lithium ion ziyi-short-range, izinto ezingezizo igesi, ukunciphisa umonakalo wolwakhiwo kunye nokwakhiwa kwerhasi ngaphakathi kwezixhobo ze-activator.
Utyetyiswa ¹⁰ B isotope nangakumbi kwandisa neutron ukufunxwa ngokufanelekileyo, ukuvumela obhityileyo, iimveliso zokukhusela ezisebenza kakhulu.
Ukwengeza, Ukhuseleko lweekhemikhali ze-boron carbide kunye nokumelana nemitha kuqinisekisa ukusebenza kakuhle kwexesha elide kwiindawo ezinokukhanya okuphezulu.
4. Izicelo kwiMveliso ePhambili kunye neTekhnoloji
4.1 Ukukhuselwa kweBallistic kunye ne-Wear-Resistant Components
Esona sicelo siphambili se-boron carbide powder sihlala kukwenziwa kwezixhobo ezikhaphukhaphu zeceramic zabasebenzi, iilori, kunye nenqwelomoya.
Xa ifakwe kwiithayile ze-ceramic kwaye idityaniswe ngqo kwiinkqubo zesikrweqe ezidibeneyo kunye ne-polymer okanye i-backings yentsimbi., B EZINE C zichitha ngempumelelo amandla ekinetic eeprojekthi zesantya esiphezulu ngokuqhekeka, ukuguqulwa kweplastiki ye-penetrator, kunye neenkqubo zokufunxa amandla.
Ubukhulu bayo obuphantsi buvumela iinkqubo zesikrweqe ezikhaphukhaphu xa kuthelekiswa nezinye ezifana netungsten carbide okanye intsimbi, kubalulekile ukuhamba komkhosi kunye nokusebenza kakuhle kwamafutha.
Ukhuseleko lwangaphambili, I-boron carbide isetyenziswa kwizinto ezinganxiliyo njengemilomo, amatywina, kunye nokunciphisa izixhobo, apho ukuqina kwayo okuqatha kwenza ubomi obude obuthile kwiindawo ezirhabaxa.
4.2 Imveliso eyoNgezelelweyo kunye neTekhnoloji ekhulayo
Inkqubela phambili yamva nje kwimveliso eyongezelelweyo (AM), ngakumbi i-binder jetting kunye ne-laser powder bed indibaniselwano, baye bavula iindlela ezintsha kraca zokuyila izinto ezinokwakheka kwe boron carbide.
Ubunyulu obuphezulu, ingqukuva B EZINE C umgubo zibalulekile kwezi nkqubo, ukubiza ukuhamba okungaqhelekanga kunye nokupakisha ubukhulu bokuqinisekisa ukufana komgangatho kunye nokuzinza kwecandelo.
Ngelixa ubunzima buhleli– njengendawo yokunyibilika ephezulu, Uxinzelelo lwe-thermal kunye noxinzelelo lwe-fracturing, kunye ne-porosity ephindaphindiweyo– uphononongo luqhubela phambili ekutyebeni ngokupheleleyo, iindawo ze-ceramic ezinokwakheka komnatha kwi-aerospace, zenyukliya, kunye nezicelo zamandla.
Ngaphaya koko, I-boron carbide ijongwa kwizixhobo ze-thermoelectric, i-slurries engathandekiyo yokuchaneka ukuchaneka, kwaye njengesigaba sokuqiniswa kwiikhompawundi ze-matrix zensimbi.
Kushwankathelo, I-boron carbide powder imi ngaphambili kwiimveliso zeceramic ezinobunkunkqele, ukudibanisa ukuqina okugqithisileyo, ukuxinana okuphantsi, kunye nomthamo we-neutron wokufunxa kwinkqubo enye engeyiyo yendalo.
Ngokulawulwa ngokuchanekileyo kokwakheka, imorphology, kunye nokusebenza, yenza ukuba kwenzeke kwiiteknoloji ezisebenza kwezona zicwangciso zifuna kakhulu, ukusuka kwizikrweqe zebala ledabi ukuya kwizixhobo zesixhobo senyukliya.
Njengoko ulungelelwaniso kunye nezicwangciso zokuvelisa ziseza kuphuhliswa, I-boron carbide powder iya kuhlala iyinto ebalulekileyo kwisizukulwana esilandelayo semveliso ephezulu yokusebenza.
5. Umthengisi
I-RBOSCHCO ngumboneleli othembekileyo wehlabathi jikelele wezinto zekhemikhali & umenzi nge over 12 iminyaka yamava ekuboneleleni ngeekhemikhali ezikumgangatho ophezulu kunye neeNanomaterials. Inkampani ithumela kumazwe amaninzi, njenge-USA, Khanada, IYurophu, I-UAE, Mzantsi Afrika, Thanzaniya, Khenya, Jiphethe, Nayijeriya, Khameruni, Yuganda, Thekhi, Mekhsikho, Azerbayijani, Bheljiyam, Sayiprasi, Umphakathi waseCzech, Brazil, Tshile, Ajentina, Dubai, Japhan, eKorea, Viyethnam, Thayilendi, Maleyishiya, Indoneshiya, Ostreliya,Jemani, Fransi, ElamaTaliyane, IPortugal njl. Njengomvelisi ophambili wophuhliso lwe-nanotechnology, I-RBOSCHCO iyongamela imarike. Iqela lethu lomsebenzi weengcali libonelela ngezisombululo ezigqibeleleyo zokunceda ukuphucula ukusebenza kakuhle kwamashishini ahlukeneyo, yenza ixabiso, kwaye umelane ngokulula nemingeni eyahlukeneyo. Ukuba ukhangela ixabiso leboron carbide ngekg, nceda uthumele i-imeyile ku: [email protected]
Iithegi: boron carbide,b4c boron carbide,ixabiso le-boron carbide
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