Steel Fiber a wɔde yɛ Refractory Castables: Melt Extraction, Grades ne Ɔhyew Shock

Atwerɛ

June 15, 2016

Refractory fiber ne structural fiber yɛ nneɛma ahorow, efi nneɛma a wɔde gyina so so kosi ne nsusuwii so. Hooked structural fiber a wɔde bedi dwuma wɔ castable mu no ne mfomso a ɛtaa ba na ne bo yɛ den sen biara wɔ saa ɔfã yi mu.

Refractory Fiber ne Structural Fiber Yɛ Nneɛma a Ɛsono

Hooked structural fiber a wɔtow gu refractory castable mu ne mfomso a ɛtaa ba na ne bo yɛ den sen biara wɔ saa ɔfã yi mu. Structural fiber no fi soro bɛyɛ 300 kosi 400 C; ɛboro saa ahoɔden no hwe ase na nneɛma a wɔde kata so no di nkogu. Refractory castables tu mmirika wɔ 800 kosi 1400 C na lining no nso gye ɔhyew ne onwini ntɛmntɛm. Ɛsono nhama a ɛyɛ hyew wɔ nneɛma mu, sɛnea ɛyɛ ne ne nsusuwii mu: ne nnyinaso yɛ dade a ɛnyɛ den, ɔkwan a wɔfa so yɛ no yɛ nea wɔde yi nsu a ɛyɛ nwini, na ne nsusuwii yɛ akuwakuw a ɛnyɛ pɛpɛɛpɛ a ɛwɔ afã abiɛsa. Botae no nyɛ tensile ahoɔden na mmom sɛ wɔbɛko atia oxidation ne mfutuma wɔ ɔhyew mu bere a ɛne castable no di nkitaho no.

Melt Extraction: Nea Enti a 3D Nneɛma a Ɛnyɛ Daa no Anchor Yiye

Melt extraction tow dade a ɛnyɛ den a wɔanwene a mframa a ɛbɔ ntɛmntɛm anaasɛ ntwahonan a twitwiw ne ho na ɛma ɛyɛ nwini ma ɛbɛyɛ nhama bere a ɛretu no. Mfonini biara nni mu, enti ne nsusuwii nyɛ nea ɛkɔ so daa: ɛyɛ kurukuruwa, ɛtɔ mmere bi a ɛyɛ nkorabata, na ɛsono ne kɛse. Saa a ɛnkɔ so pɛpɛɛpɛ no ne nea ɛde afã abiɛsa a ɛka bom ankasa ba castable no mu sen sɛ ɛbɛyɛ nhama a ɛyɛ tẽẽ no aperepere kronkron. Wɔ sɔhwɛ ahorow a wɔde toto ho mu no, nhama a wɔayiyi afi nsu mu no ma modulus of rupture kɔ soro kɛse sen nhama a ɛyɛ tẽẽ wɔ dodow a ɛyɛ pɛ mu, na nea enti a ɛte saa ne anchorage geometry. Petepete ne mfaso a ɛto so abien: nhama a wɔayiyi afi nsu mu no tetew mu wɔ afrafra a ɛyɛ dry anaa nsu mu na ɛkyekyere castable no a ennyaw baabi a hwee nni hɔ, na baabi a ɛda hɔ kwa wɔ lining mu ne baabi a spalling fi ase.

304, 310S ne 446: Ɔhyew na Ɛkyerɛ Abasobɔde no

Grade abiɛsa kata temperature bands abiɛsa so na eyi ne gyinaesi a edi kan. 304 ne gyinapɛn a wɔde ma wɔ ɔsom a ɛkɔ so kosi 650 C; 310S a wɔsan tɔn no sɛ 2520 no kata ɔhyew a ɛwɔ mfinimfini ne nea ɛkɔ soro so kodu 1200 C; 446 yɛ ɔhyew a ɛkorɔn a ɛko tia oxidation grade to 1400 C. Paw nea ɛba fam dodo na fiber no oxidises, hwere ɔfã na lining no di nkogu ntɛm; paw nea ɛkɔ soro dodo na ɛka a wɔbɔ no sɛe. Asɛmmisa no nyɛ fononoo no mu dodow a ɛsen biara na mmom ɔhyew a ɛtra hɔ kyɛ a ɛwɔ ɔfa a nhama no te mu no ho.A lining wɔ gradient, a 1400 C wɔ anim a ɛyɛ hyew na ebia 800 C wɔ akyi, enti layers abien no betumi de grade ahorow adi dwuma.

Thermal Shock: Nsu Duonu a Ɛde Dum fi 1000 C

Wɔnhyew nneɛma a ɛma ogya ntumi nhyew no ɔha biara mu aduɔwɔtwe na mmom ɛnam ɔhyew ne onwini a ɛyɛ ntɛmntɛm so wosow. Botae a dade nhama so wɔ ɔhyew mu ahodwiriw mu no rekyere mpaapaemu nyin: bere a matrix no mu apaapae akyi no, nhama no twa mpaapaemu no ho hyia, ɛma ne tɛtrɛtɛ yɛ ketewaa na esiw spalling ano. Susuo no yɛ kyinhyia, a wɔdum fi 1000 C kɔ nsuo mu, mpɛn aduonu a ɛnpaapae anaasɛ ɛnsɛe. Saa sɔhwɛ no ka pii fa ɔsom nkwa nna ho sen modulus of rupture, efisɛ shutdown ma ɛyɛ nwini ntɛmntɛm sen heat-up.

Dosage Di Lining System no akyi, Ɛnyɛ Generic kg/m3

Structural concrete wɔ adwumayɛ kwan a ɛyɛ 30 kosi 80 kg/m3; refractory castables nyɛ saa. Dosage gyina aggregate grading, nsuo a wɔhwehwɛ, ɔkwan a wɔfa so de si hɔ (casting, ramming, gunning) ne lining thickness, na mpɛn pii no ɛba fam wɔ 0.5% ne 2% wɔ volume mu. Dodow na adwumayɛ tumi hwe ase, adwumayɛfo no de nsu ka ho, na nsu a wɔde ka ho no sɛe ahoɔden a ɛmma ogya ntumi nhyew. Ɛno ne afuw mu huammɔdi a ɛtaa ba wɔ saa ade yi mu. Adeyɛ a ɛteɛ ne sɛ nea ɔde refractory ma no de mix design no bɛma na fiber yɛfo no de ama atia no, na wɔn baanu nyinaa fi mfiridwuma ho apam biako mu yɛ adwuma.

Spalling a Ɛpae: Nea Enti a Fiber Tew So

Sɛ wodi kan yɛ hyew a, nsu a ɛwɔ castable no mu dan nsuonwini, na sɛ entumi nkwati a nhyɛso no mu paapae nea wɔde akata so no mu. Dade nhama boa denam akwan a ɛka bom a ɛma nsuo yɛ hyew ne mpaapaemu a ɛma ɛbue nkakrankakra, na ɛdan mpaapaemu ma ɛbɛyɛ mpaapaemu. Wɔ linings a ɛyɛ den ne wet low-cement castables fam no eyi ho hia sen ahoɔden a wobenya. Nneɛma bi a wɔde frafra nso de organic fiber a ne melting point bɛn 165 C ka ho, na ɛhyew ntɛm na ɛma mframa kwan, na ɛboa dade fiber no. Ɛno nti na nhama ahorow abien taa pue wɔ aduannoa biako a ɛnyɛ den mu no.

Mfɛnsere Teateaa a Ɛyɛ Ɔha biara mu 0.5 kosi 2 wɔ Castables mu

Steel fiber kɔ refractory castable mu sɛnea ɛbɛyɛ a ɛbɛko atia thermal shock spalling, na ɛnyɛ sɛ ɛbɛma awɔw ahoɔden akɔ soro, ɛno nti na dosage window no yɛ teateaa: ɔha biara mu 0.5 kosi 2 wɔ ne kɛse mu, na dodow no ara a wɔde di dwuma no bɛyɛ ɔha biara mu 1. Wɔ ɔha biara mu nkyem 0.5 ase no, nhama kakraa bi na ɛwɔ wimhyɛn a ɛpaapae mu a ebetumi abɔ ho ban. Bɛboro ɔha biara mu nkyem 2 nhama no twitwiw bere a wɔrefrafra no, adwumayɛ a ɛhwe ase, na wosow ma orientation layering a ɛma wimhyɛn a ɛyɛ mmerɛw wɔ layers ntam. Fiber tenten bata aggregate kɛse a ɛsen biara ho, mpɛn pii no anyɛ yiye koraa no saa kɛse no mmɔho abiɛsa, anyɛ saa a aggregate siw fiber no kwan na network biara a ɛkɔ so nhyehyɛ; nanso ɛboro mm 40 so no, nhama no si hɔ bere a ɛrewosow no. Mixing order ma huammɔdi pii ba sen dodow a wɔde ma. Dry-blend powder ne fiber no simma abien kosi abiɛsa ma fiber no petepete powder no mu, afei fa nsu gu mu; da sɛ fa nsuo nhyɛ mu kan na fa fiber petepete so wɔ ɛno akyi, a ɛyɛ bɔɔl bere nyinaa. Dry-out curve no na esi nea ebefi mu aba no ho gyinae: kura digrii Celsius 150 mu na ama woatumi atu nsu a enni mu, kura mu wɔ 350 mu na ama woatumi atu nsu a wɔde nnuru akyekyere no, na afei nkutoo na woforo bɛboro 600 akodu ɔsom hyew mu, na wɔma bere a ɛwɔ anammɔn biara mu no yɛ kɛse ma ɛyɛ kɛse. Ɔhyew ntɛmntɛm dodo na emu nsuonwini nhyɛso nni baabiara a ɛbɛkɔ, ɔfasu no spalls, na ɛno ne biako a huammɔdi mode fiber ntumi nnye. Grade di fononoo no akyi: 304 wɔ digrii Celsius 650 ase, 310S sen 1000, ne 446 ma fononoo mmeae bɛyɛ 1400 nkutoo.

Nsɛmmisa Abiɛsa a Ɛsɛ sɛ Wobisa Ɔdemafo

Nsɛmmisa abiɛsa yiyi wɔn a wɔde fiber a ɛnyɛ den pii ma no mu dodow no ara. Nea edi kan, ne base grade 304, 310S anaa 446, na ɛyɛ material adansedi krataa a ɛwɔ hɔ. Nea ɛto so abien no, dɛn ne ne kɛse ne ne tenten ankasa, mpɛn pii no ne ntwemu yɛ mm 0.3 kosi 0.5 na ne tenten yɛ mm 15 kosi 20, na so wobetumi atwitwa ma ayɛ sɛ nea wɔde akata so no mu duru. Nea ɛto so abiɛsa no, so thermal shock cycle data wɔ hɔ. Sɛ wopɛ grade ne temperature ratings a, refractory fã a ɛwɔ steel fiber product kratafa no mu no kyerɛw 304, 310S, 446 ne 430 a ɛwɔ temperature ne thermal shock data, a wobetumi de abata asɛmmisa no ho tẽẽ sɛ mfiridwuma mu nkaebɔ.