Reaction sintering na pression sintering silicon karbide ceramic gahunda yo gutegura

Icyaha

Igisubizosilicon carbide ceramicibikorwa byo kubyaza umusaruro birimo ceramic compacting, sintering flux infiltration agent compacting, reaction sintering ceramic produits, silicon carbide wood ceramic gutegura nizindi ntambwe.

Reaction sintering silicon karbide nozzle

Ubwa mbere, 80-90% yifu ya ceramic (igizwe nifu imwe cyangwa ebyiri zaifu ya silicon karbideifu ya boron karbide), 3-15% yifu ya karubone (igizwe na kimwe cyangwa bibiri bya karuboni yumukara na fenolike) hamwe na 5-15% byumushinga (fenolike resin, polyethylene glycol, hydroxymethyl selulose cyangwa paraffine) bivangwa neza. ukoresheje urusyo rwumupira kugirango ubone ifu ivanze, itera spray yumye kandi igasya, hanyuma ugakanda mubibumbano kugirango ubone ceramic ceramic ifite imiterere itandukanye.
Icya kabiri, ifu ya silicon 60-80%, ifu ya karbide ya silicon 3-10% na poro ya nitride ya boron 37-10% bivangwa neza, hanyuma bigakanda mubibumbano kugirango ubone uburyo bwo gucengeza ibintu.
Ububiko bwa ceramic hamwe na comptabilite ya sinteur noneho bigashyirwa hamwe, hanyuma ubushyuhe bukazamuka bugera kuri 1450-1750 ℃ ​​mu itanura rya vacuum hamwe na dogere ya vacuum itari munsi ya 5 × 10-1 Pa yo gucumura no kubika ubushyuhe kuri 1-3 amasaha kugirango ubone reaction yacumuye ibicuruzwa. Ibisigisigi byacengeye hejuru yubutaka bwa ceramique byavanyweho mukanda kugirango ubone urupapuro rwuzuye rwa ceramic, kandi imiterere yumwimerere irakomeza.
Hanyuma, uburyo bwo gucumura bwakiriwe, ni ukuvuga, silikoni ya silikoni cyangwa silikoni ivanze hamwe nigikorwa cyibikorwa byubushyuhe bwo hejuru byinjira mubutaka bwuzuye ceramic irimo karubone ikoresheje imbaraga za capillary, hanyuma igakora na karubone irimo gukora karbide ya silikoni, iyo izaguka mubunini, kandi imyenge isigaye yuzuye silicon yibanze. Ceramic yubusa irashobora kuba karubone nziza cyangwa silicon karbide / ibikoresho bya karubone. Iyambere iboneka mugukiza catalitike no pyrolyzing resin organic, pore yambere na solve. Iyanyuma iboneka hamwe na pyrolyzing silicon karbide ibice / resin ishingiye kubikoresho kugirango ubone ibikoresho bya silicon karbide / ibikoresho bishingiye kuri karubone, cyangwa ukoresheje α-SiC hamwe nifu ya karubone nkibikoresho byo gutangiza no gukoresha uburyo bwo gukanda cyangwa gutera inshinge kugirango ubone ibice. ibikoresho.

Gucumura

Uburyo bwo gucumura bidafite umuvuduko wa karubide ya silicon irashobora kugabanywamo ibice bikomeye byo gucumura no gucamo ibice. Mu myaka yashize, ubushakashatsi kurisilicon carbide ceramicsmu gihugu no hanze yaribanze cyane cyane kumazi-feri yo gucumura. Igikorwa cyo gutegura ceramic ni: kuvanga umupira wo gusya -> gutera granulation -> gukanda byumye -> gukomera kwicyatsi kibisi -> gucumura vacuum.

Ibicuruzwa bidafite imbaraga bya silicon karbide ibicuruzwa

Ongeramo ibice 96-99 bya silicon karbide ultrafine ifu (50-500nm), ibice 1-2 byifu ya boron karbide ultrafine (50-500nm), ibice 0.2-1 bya nano-titanium boride (30-80nm), ibice 10-20 y'amazi ya elegitoronike ya fenolike, hamwe na 0.1-0.5 ibice byogukwirakwiza cyane kumashanyarazi kugirango basya imipira kandi bavange amasaha 24, hanyuma ushire ibishishwa bivanze bivanze; ingunguru yo gukurura amasaha 2 kugirango ikureho ibituba.
Uruvange rwavuzwe haruguru rushyirwa mu munara wa granulation, hamwe nifu ya granulation hamwe na morphologie nziza, amazi meza, ikwirakwizwa ryimyanya ndangagitsina hamwe nubushuhe buringaniye biboneka mugucunga umuvuduko wa spray, ubushyuhe bwinjira mu kirere, ubushyuhe bw’ikirere hamwe nubunini bwa spray. Guhinduranya inshuro ya centrifugal ni 26-32, ubushyuhe bwo mu kirere ni 250-280 ℃, ubushyuhe bwo mu kirere ni 100-120 and, naho umuvuduko winjira ni 40-60.
Ifu ya granulation yavuzwe haruguru ishyirwa mubutaka bwa karbide ya sima kugirango ukande kugirango ubone umubiri wicyatsi. Uburyo bwo gukanda ni igitutu cyerekezo, kandi imashini yimashini ya tonnage ni toni 150-200.
Umubiri wicyatsi ukanda ushyirwa mu ziko ryumye kugirango wumuke kandi ukire kugirango ubone umubiri wicyatsi ufite imbaraga zicyatsi kibisi.
Umubiri wicyatsi ukize ushyizwe muri aigishushanyo mbonerahanyuma ugatondekanya hafi kandi neza, hanyuma igishushanyo kiboneka hamwe numubiri wicyatsi gishyirwa mumatara yubushyuhe bwo hejuru bwa vacuum sintering yo kurasa. Ubushyuhe bwo gucana ni 2200-2250 and, naho igihe cyo kubika ni amasaha 1-2. Ubwanyuma, imikorere-yumuvuduko mwinshi sinteri ya silicon karbide ceramics iraboneka.

Icyiciro gikomeye

Uburyo bwo gucumura bidafite umuvuduko wa karubide ya silicon irashobora kugabanywamo ibice bikomeye byo gucumura no gucamo ibice. Amazi yo mu cyiciro cya Liquid arasaba kongeramo inyongeramusaruro, nka Y2O3 binary na ternary yongeweho, kugirango SiC nibikoresho byayo bigizwe nibice byamazi kandi bigere kubucucike mubushyuhe buke. Uburyo bwo gutegura ibyiciro bikomeye byacuzwe na silicon karbide ceramics harimo kuvanga ibikoresho fatizo, gutera granulation, kubumba, no gucumura vacuum. Uburyo bwihariye bwo kubyaza umusaruro nuburyo bukurikira:
70-90% ya subicron α silicon karbide (200-500nm), 0.1-5% ya karbide ya boron, 4-20% ya resin, na 5-20% bya binger organique bishyirwa mubivanga hanyuma bikongerwamo amazi meza kugirango bitose kuvanga. Nyuma yamasaha 6-48, ibivanze bivanze binyuzwa mumashanyarazi 60-120;
Amashanyarazi yashizwemo ni spray yatewe muminara ya spray granulation. Ubushyuhe bwinjira bwumunara wa spray granulation ni 180-260 ℃, naho ubushyuhe bwo gusohoka ni 60-120 ℃; ubwinshi bwinshi bwibikoresho byasunitswe ni 0,85-0.92g / cm3, amazi ni 8-11s / 30g; ibikoresho byasunitswe binyuze mumashanyarazi 60-120 kugirango bikoreshwe nyuma;
Hitamo ifumbire ukurikije imiterere y'ibicuruzwa byifuzwa, shyira ibintu byasunitswe mu cyuho, hanyuma ukore ubushyuhe bwo mucyumba bwo kugabanya ubushyuhe bwa 50-200MPa kugirango ubone umubiri w'icyatsi; cyangwa shyira umubiri wicyatsi nyuma yo kwikuramo ibumba igikoresho cyo gukanda isostatike, kora isostatike ku muvuduko wa 200-300MPa, hanyuma ubone umubiri wicyatsi nyuma yo gukanda kabiri;
Shira umubiri wicyatsi wateguwe muntambwe yavuzwe haruguru mumatanura ya vacuum yo gucumura, kandi uwujuje ibisabwa ni silicon karbide yarangije amasasu yamashanyarazi; muburyo bwo gucumura hejuru, banza wimure itanura ryacumuye, kandi iyo dogere ya vacuum igeze kuri 3-5 × 10-2 Nyuma ya Pa, gaze ya inert inyuzwa mumatanura yumucyo kumuvuduko usanzwe hanyuma igashyuha. Isano iri hagati yubushyuhe nigihe ni: ubushyuhe bwicyumba kugeza 800 ℃, amasaha 5-8, kubika ubushyuhe kumasaha 0.5-1, kuva 800 ℃ kugeza 2000-2300 ℃, amasaha 6-9, kubika ubushyuhe kumasaha 1 kugeza 2, hanyuma akonje hamwe nitanura hanyuma agabanuka mubushyuhe bwicyumba.

Microstructure hamwe nimbibi za karubide ya silicon yacumuye kumuvuduko usanzwe

Muri make, ububumbyi bwakozwe nuburyo bukonje bwo gucumura bugira imikorere myiza, ariko igiciro cyumusaruro nacyo cyiyongereye cyane; ububumbyi bwateguwe no gucumura bidafite umuvuduko bifite ibikoresho byibanze bisabwa, ubushyuhe bwo hejuru, ibicuruzwa binini bihinduka, inzira igoye nibikorwa bike; ibicuruzwa bya ceramic byakozwe nuburyo bwo gucumura bigira ubwinshi, imikorere irwanya ballistique, nigiciro gito cyo kwitegura. Uburyo butandukanye bwo gucumura muburyo bwa silicon karbide ceramics ifite ibyiza byayo nibibi, kandi ibyasabwe nabyo bizaba bitandukanye. Nibikorwa byiza byo guhitamo uburyo bwiza bwo gutegura ukurikije ibicuruzwa hanyuma ugashaka impirimbanyi hagati yikiguzi gito nigikorwa kinini.