Sarudzo ye silica sol coating inozokanganisa zvakananga kushata kwepamusoro uye kurongeka kweInvestment castings. Silica sol coatings kazhinji inogona kusarudza zvakananga silica sol ine chikamu chema silica che30%. Nzira yekuputira iri nyore uye kushanda kuri nyore. Panguva imwecheteyo, iyo yekukanda mold shell inogadzirwa nekushandisa iyo coating ine simba rakakura, uye kutenderera kwekugadzira goko kunogona zvakare kupfupikiswa.
Silica sol yakajairika mvura-based binder ine silicic acid colloid chimiro. Iyo polymer colloidal mhinduro umo yakapararira zvakanyanya silica particles inonyungudika mumvura. Iyo colloidal particles ine spherical uye ine dhayamita ye6-100 nm. Thenzira yekukanda marikugadzira goko ndiyo nzira yekugera. Pane zvinhu zvakawanda zvinopesvedzera gelation, kunyanya electrolyte, pH, sol concentration uye tembiricha. Kune akawanda marudzi ekutengesa silica sols, uye inonyanya kushandiswa ndeye alkaline silica sol ine silica yemukati ye30%. Maitiro ekugadzira silica sol shell ari nyore. Nzira imwe neimwe ine maitiro matatu: kupfekedza, kuisa jecha, uye kuomesa. Maitiro ega ega anodzokororwa kakawanda kuti awane multilayer goko rehukobvu hunodiwa.
Pane kazhinji nzira mbiri dzekugadzira silica sol: ion exchange uye dissolution. Iyo ion yekutsinhana nzira inoreva kuchinjisa ion kwegirazi remvura rakadzikiswa kubvisa sodium ion uye kumwe kusvibiswa. Zvadaro mhinduro yacho inosefa, inopisa uye yakanyungudutswa kune imwe density kuti iwane silica sol. Iyo nzira yekunyungudutsa inoreva kushandisa indasitiri yakachena silicon (iyo yakawanda chikamu chesilicon ≥ 97%) seyakagadzirwa, uye pasi pechiito cheiyo catalyst, inonyungudika zvakananga mumvura mushure mekupisa. Zvadaro, mhinduro yacho inosefa kuti iwane silica sol.
Technical Parameters yeSilica Sol ye Investment Casting | ||||||||
| Aihwa. | Kemikari Inoumbwa (chikamu chezhinji,%) | Zvinhu Zvenyama | Vamwe | |||||
| SiO2 | Na2O | Density (g/cm3) | pH | Kinematic Viscosity (mm2/s) | SiO2 Particl Size (nm) | Apperance | Stationary Phase | |
| 1 | 24-28 | ≤ 0.3 | 1.15 - 1.19 | 9.0 - 9.5 | ≤ 6 | 7 - 15 | mune invory kana kuti chiedza chegirini ruvara, pasina tsvina | ≥ 1 gore |
| 2 | 29-31 | ≤ 0.5 | 1.20 - 1.22 | 9.0 - 10 | ≤ 8 | 9 - 20 | ≥ 1 gore | |
Iwo akakandwa anowanikwa ne silica sol shell kugadzira maitiro ane yakaderera pamusoro roughness, yakakwirira dimensional kunyatsoita uye refu goko rekugadzira kutenderera. Iyi nzira inoshandiswa zvakanyanya mukukanda alloys anodzivirira kupisa-kupisa, masimbi asingasviki, simbi isina tsvina, carbon steels, low alloys, aluminium alloys uye copper alloys.
Iyo silica sol chaiyo yakarasika wax yekudyara yekukandira maitiro inokodzera kudzokororwa kugadzirwa kwe mambure maumbirwo ezvikamu kubva kune akasiyana siyana simbi uye yakakwirira performance alloys. Kunyange zvazvo ichiwanzo shandiswa kuita zvidiki zvekukandira, maitiro aya akashandiswa kugadzira mafuremu emadhoo endege akazara, ane simbi inokandwa inosvika 500 kgs uye aluminium castings inosvika makumi mashanu kgs. Kuenzaniswa nemamwe maitiro ekukanda akadai sekukanda kufa kana jecha, inogona kuve inodhura maitiro. Nekudaro, izvo zvikamu zvinogona kugadzirwa uchishandisa investment casting inogona kusanganisira yakaoma contours, uye kazhinji zvikamu zvinokandwa padhuze net mambure, saka zvinoda kushoma kana kusazoitwazve kana ikandwa.
Zvikamu zvikuru zvewax coating yeinvestment casting process ndeiyi:
Surface layer silica sol adhesive. Inogona kuvimbisa kusimba kwepamusoro pepamusoro uye kuve nechokwadi kuti iyo yepamusoro haina kuputika;
Refractory. Iyo inowanzo yakakwirira-kuchena zirconium poda kuti ive nechokwadi chekuti iyo yekupfeka ine refractoriness yakakwana uye haina kemikari kuita nesimbi yakanyungudutswa.
Lubricant. Icho chinhu chepamusoro. Nekuti iyo silica sol coating ndeyemvura-based coating, kunyorova pakati payo newakisi mold haina kunaka, uye kupfekedza nekurembera hakuna kunaka. Nokudaro, zvakakosha kuwedzera mumiriri wemvura kuti uvandudze kuvhara uye kurembera kushanda.
Defoamer. Iyo zvakare surfactant ine chinangwa chekubvisa mabhuru emhepo mune yekunyorova agent.
Munatsi wezviyo. Iyo inogona kuve nechokwadi kukwenenzverwa kwezviyo zvekukanda uye kugadzirisa ma mechanic zvimiro zvekukanda.
Mamwe maapendages:inomisa mumiriri, chiratidzo chekuomesa, inosimudzira kuburitsa mumiriri, nezvimwewo.
Kusarudzwa kwakaringana kwechikamu chechikamu chega chega mune silica sol coating ndiyo kiyi yekuve nechokwadi chemhando yekupfeka. Izvo zvikamu zviviri zvakanyanya muhupfeko ndeye refractories uye binders. Chiyero chiri pakati pezviviri ndiyo chiyero chehupfu-ku-mvura yekuputira. Iyo yehupfu-ku-mvura yependi ine simba guru pakushanda kwepende uye shell, iyo inozopedzisira yakanganisa kunaka kwekukanda. Kana chiyero cheupfu-ku-mvura yekuputira chakanyanya kuderera, chifukidzo hachizove chakaoma zvakakwana uye pachava nevoid yakawandisa, iyo ichaita kuti pamusoro pekukanda kwakashata. Uyezve, iyo yakanyanyisa yakaderera yehupfu-ku-mvura muyero inozowedzerawo maitiro ejasi kutsemuka, uye simba regoko richave rakaderera, izvo zvinozopedzisira zvakonzera kubuda kwesimbi yakanyungudutswa panguva yekukanda. Kune rumwe rutivi, kana chiyero cheupfu-ku-mvura chakanyanyisa, kupfekedza kunenge kwakanyanyisa uye kunyunguduka kuchave kusina kunaka, zvichiita kuti zviome kuwana jira rine yunifomu gobvu uye kukora kwakakodzera.
Kugadzirira kupfekedza chikamu chakakosha chekuvimbisa kunaka kwegomba. Paunenge uchigadzira chifukidzo, zvikamu zvinofanira kunge zvakaparadzirwa zvakafanana uye zvakanyatsosanganiswa uye zvakanyorova pamwe chete. Midziyo inoshandiswa pakugadzira pendi, nhamba yekuwedzera uye nguva yekukurudzira zvose zvichakanganisa kunaka kwepende. Yedu yekudyara yekukanda shopu inoshandisa inoenderera musanganiswa. Kuti uve nechokwadi chehutano hwekuputira, apo zvose zvikamu zvehuputi zvichangobva kuwedzerwa zvinhu zvakasvibirira, kuvhara kunofanira kukurudzirwa kwenguva yakareba yakakwana.
Kudzora kwezvinhu zve silica sol coatings idanho rakakosha rekudzora nhanho. Iyo viscosity, density, ambient tembiricha, nezvimwe zvepende inofanira kuyerwa kanenge katatu pazuva, uye inofanira kudzorwa mukati meiyo yakatarwa chero nguva.
Nguva yekutumira: Jul-25-2022