IHydroxypropyl methylcellulose (HPMC) sisidibaniso esisebenza ngeendlela ezininzi nesiyimfuneko ekwenzeni iiseramikhi zenqatha lobusi. Iiseramics ze-honeycomb ziphawulwa ngesakhiwo sazo esisodwa setshaneli ezihambelanayo, ezibonelela ngommandla ophezulu kunye nokuhla koxinzelelo oluphantsi, okwenza ukuba zilungele izicelo ezifana neziguquli ze-catalytic, izihluzi, kunye nokutshintsha ubushushu. I-HPMC, i-cellulose ether derivative, idlala iindima ezibalulekileyo eziliqela ekuvelisweni kwezi zeseramics, zinefuthe ekusetyenzweni, kwisakhiwo, kunye nokusebenza kwemveliso yokugqibela.
Iipropati ze-HPMC
I-HPMC ithathwe kwi-cellulose, eyona polymer yendalo ininzi, ngokuguqulwa kweekhemikhali ezizisa i-hydroxypropyl kunye namaqela e-methyl. Olu hlengahlengiso luphucula ukunyibilika kwe-ether cellulose emanzini kunye nezinyibilikisi zezinto eziphilayo, kwaye zichaphazela neempawu zerheological zeHPMC. Iimpawu eziphambili zeHPMC ziquka:
I-Thermoplasticity: I-HPMC inokwenza iifilimu kunye neejeli xa zifudumeza, eziluncedo ekubopheni nasekwenzeni iiseramikhi.
Ukugcinwa kwamanzi: Inamandla okugcina amanzi aphezulu, okubalulekileyo ukugcina ukufuma kwiipaste zeceramic.
Ukuguqulwa kwe-Rheology: Izisombululo ze-HPMC zibonisa ukuziphatha kwe-pseudoplastic, okuthetha ukuba ziyancipha i-viscous phantsi koxinzelelo lwe-chear, olunceda ekubunjweni nasekukhutshweni kwezinto ze-ceramic.
Ukubophelela amandla: Isebenza njengesibophelelo esihle kakhulu, siphucula amandla aluhlaza emizimba ye-ceramic.
Indima ye-HPMC kwimveliso yeeCeramics zeNcinci
1. Inkqubo ye-Extrusion
Indlela ephambili yokuvelisa i-honeycomb ceramics yi-extrusion, apho umxube we-ceramic powder, amanzi, kunye neentlobo ezahlukeneyo zokudibanisa zinyanzeliswa ngokufa ukuze zenze isakhiwo se-honeycomb. I-HPMC idlala indima ebalulekileyo kule nkqubo:
Ulawulo lweRheological: I-HPMC ilungisa iipropathi zokuhamba kwencama yeceramic, iyenza kube lula ukukhupha kwi-honeycomb die. Iyanciphisa i-viscosity ye-paste phantsi kwe-shear (uxinzelelo lwe-extrusion), iququzelele ukuhamba kakuhle ngaphandle kokuvala okanye ukuguqula iziteshi ezithambileyo.
Ukugcinwa kobume: Emva kokuba ikhutshiwe, i-ceramic paste kufuneka igcine imilo yayo de yome ngokwaneleyo. I-HPMC ibonelela ngentembeko yesakhiwo sexeshana (amandla aluhlaza), ivumela ulwakhiwo lwenqatha lobusi ukugcina imilo kunye nemilinganiselo ngaphandle kokudilika okanye ukulwa.
Ukuthambisa: Impembelelo ye-lubricant ye-HPMC inceda ukunciphisa ukungqubuzana phakathi kwe-paste kunye ne-die, ukunciphisa ukuguga kwezixhobo kunye nokuphucula ukusebenza kakuhle kwenkqubo ye-extrusion.
2. Amandla okuHlaza kunye nokuPhathwa
Emva kwe-extrusion, i-honeycomb ye-ceramic ikwimeko "eluhlaza"-engatshiyo kwaye ibuthathaka. I-HPMC inegalelo elikhulu kwiipropati zokuphatha i-ceramic eluhlaza:
Amandla oLuhlaza olomeleziweyo: I-HPMC isebenza njenge-binder, ibambe amaqhekeza e-ceramic kunye ngeempawu zayo zokwenza ifilimu. Oku kubalulekile ekuphatheni kunye namanyathelo okulungisa alandelayo, ukunciphisa umngcipheko womonakalo ngexesha lokumisa nokuphatha.
Ulawulo lokufuma: Ikhono lokugcinwa kwamanzi kwe-HPMC liqinisekisa ukuba intlama ihlala ithambile ixesha elide, ukunciphisa umngcipheko wokuqhekeka kunye neziphene ngexesha lokuqala lokumisa.
3. Inkqubo yokomisa
Ukomisa kuyinyathelo elibalulekileyo ekuvelisweni kweekeramics ze-honeycomb, apho ukukhutshwa kwamanzi kunokukhokelela ekunciphiseni kunye neziphene ezinokuthi zibe nokuqhekeka okanye ukugoba. I-HPMC inceda kweli nqanaba ngokuthi:
Ukomisa Okufanayo: Iipropati zokugcina ukufuma kwe-HPMC zinceda ekufezekiseni izinga lokumisa elifanayo kulo lonke ulwakhiwo lwe-honeycomb, ukunciphisa ukuphuhliswa kwee-gradients ezinokukhokelela kwiintanda.
I-Shrinkage elawulwayo: Ngokulawula ukukhutshwa kwamanzi, i-HPMC inciphisa ukuhlukana okungafaniyo, okunceda ekugcineni ukunyaniseka kwesakhiwo seendlela zobusi.
4. Ukudubula nokuSintering
Kwinqanaba lokudubula, i-ceramic eluhlaza ifudunyezwa kumaqondo aphezulu okushisa ukufikelela kwi-sintering, apho iinqununu ze-ceramic zidibanisa ukuze zenze isakhiwo esiqinileyo, esiqinileyo. I-HPMC, nangona ingabandakanyekanga ngokuthe ngqo kwesi sigaba, inefuthe kwisiphumo:
Ukuvutha: I-HPMC iyabola kwaye iyatshisa ngexesha lokudubula, ishiya ngasemva i-matrix ecocekileyo ye-ceramic. Ukuchithwa kwayo okulawulwayo kunegalelo ekuphuhlisweni kwesakhiwo esifanayo se-pore ngaphandle kwekhabhoni ebalulekileyo eseleyo okanye ezinye izinto ezingcolileyo.
Uphuhliso lweZakhiwo zePore: Ukususwa kwe-HPMC kunokuncedisa ekudaleni i-porosity efunwayo ngaphakathi kwe-ceramic, enokuthi ibaluleke kakhulu kwizicelo ezifuna ukuhamba okuthe ngqo okanye iimpawu zokucoca.
Ukuqwalaselwa kwesicelo
Abaguquleli beCatalytic
Kwi-catalytic converters, iiseramics ze-honeycomb ezigqunywe ngezinto ezincedisayo ziququzelela ukunciphisa ukukhutshwa okuyingozi. I-HPMC iqinisekisa ukuba i-substrate ye-ceramic inamandla amakhulu omatshini kunye nesakhiwo esihambelanayo, esiyimfuneko ekusebenzeni ngokufanelekileyo komguquli phantsi koxinzelelo oluphezulu lwe-thermal kunye noomatshini.
Iinkqubo zoHlulo
Ukusetyenziswa kokucoca, ukufana kunye nokunyaniseka kwesakhiwo se-honeycomb kubaluleke kakhulu. HPMC inceda ukufezekisa ijiyometri echanekileyo kunye nokuzinza koomatshini efunekayo ukucoca amasuntswana okanye iigesi ngokufanelekileyo.
IziTshintshiso zoBubushushu
Kutshintshiselwano lobushushu, iikeramics ze-honeycomb zisetyenziselwa ukunyusa ukuhanjiswa kobushushu ngelixa kuncitshiswa ukuhla koxinzelelo. Ukulawulwa kweenkqubo zokukhupha kunye nokomisa ezibonelelwa yi-HPMC kubangela ukuba kuchazwe kakuhle kunye nesakhiwo esifanayo somjelo esenza ngcono ukusebenza kwe-thermal.
Imingeni kunye nezinto ezintsha
Ngelixa i-HPMC ibonelela ngeenzuzo ezininzi ekwenzeni iiseramikhi zenqatha lobusi, kukho imingeni eqhubekayo kunye neendawo ezintsha:
UPhuculo loKwakha: Ukufumana ugxininiso olufanelekileyo lwe-HPMC yeengoma ezahlukeneyo ze-ceramic kunye nokusetyenziswa kufuna uphando oluqhubekayo kunye nophuhliso.
Impembelelo yokusingqongileyo: Nangona i-HPMC ivela kwi-cellulose, ukuguqulwa kweekhemikhali kunye neenkqubo ze-synthesis ziphakamisa inkxalabo yokusingqongileyo. Ukuphuhlisa iindlela zemveliso ezizinzileyo okanye ezinye iindlela ezizezinye yinkalo yophando olusebenzayo.
IiPropati eziSebenzayo ezongeziweyo: Ukuqhubela phambili kwimiqulu ye-HPMC kujolise ekuphuculeni uzinzo lwe-thermal, ukusebenza kakuhle kokubopha, kunye nokuhambelana nezinye izongezo zokuphucula ukusebenza kweeseramikhi ze-honeycomb kwizicelo ezifunwayo.
IHydroxypropyl methylcellulose (HPMC) sisongezo esibalulekileyo kwimveliso yeeseramikhi zenqatha lobusi, ibe nefuthe elikhulu ekusetyenzweni, kwisakhiwo, kunye nokusebenza kwezi zinto. Ukusuka ekuququzeleleni ukomelela ukuya ekwandiseni amandla aluhlaza kunye nokuqinisekisa ukomiswa okufanayo, iipropathi ze-HPMC zibotshelelwe ukufikelela kwiimveliso ze-ceramic ezikumgangatho ophezulu ezifanelekileyo kwizicelo ezahlukeneyo zemizi-mveliso. Izinto ezintsha eziqhubekayo kunye nokulungiswa kweendlela ze-HPMC ziyaqhubeka nokwandisa indima yayo kwintsimi ehlala iguquguquka yeeseramikhi eziphambili.
Ixesha lokuposa: Jun-17-2024