Terminology of hard alloy(1)

Kukurudzira kunzwisiswa kwemishumo uye zvinyorwa zvehunyanzvi nezve alloy yakaoma, kumisa izwi, uye kutsanangura zvinoreva mazwi ehunyanzvi muzvinyorwa, tiri pano kuti tidzidze mazwi eiyo hard alloy.

Tungsten Carbide

Tungsten carbide inoreva masintered composite anosanganisira refractory metal carbides uye masimbi anosunga. Pakati pesimbi carbides iri kushandiswa parizvino, tungsten carbide (WC), titanium carbide (TiC), uye tantalum carbide (TaC) ndizvo zvinonyanya kutaurwa. Cobalt simbi inoshandiswa zvakanyanya mukugadzira simende ye carbide sebhainda. Kune mamwe maapplication akakosha, masimbi anosunga senge nickel (Ni) uye iron (Fe) anogona zvakare kushandiswa.

Density

Density zvinoreva huwandu-ku-vhoriyamu reshiyo yechinhu, iyo inodaidzwa zvakare kuti chaiyo giravhiti. Huwandu hwayo hunewo huwandu hwema pores muzvinyorwa. Tungsten carbide (WC) ine density ye15.7 g/cm³ uye cobalt (Co) ine density ye8.9 g/cm³. Naizvozvo, sezvo iyo cobalt (Co) zvirimo mu tungsten-cobalt alloys (WC-Co) inoderera, kuwanda kwese kuchawedzera. Kunyange zvazvo kuwanda kwetitanium carbide (TiC) iri pasi peiyo tungsten carbide, inongova 4.9 g/cm3. Kana TiC kana zvimwe zvikamu zvishoma zvishoma zviwedzerwa, kuwanda kwese kunoderera. Nemamwe maumbirwo emakemikari ezvinyorwa, kuwedzera kwepores mune zvinyorwa kunoguma nekuderera kwehuwandu.

Kuoma

Kuomarara zvinoreva kugona kwechinhu kuramba deformation yepurasitiki.

Vickers hardness (HV) inoshandiswa zvakanyanya pasi rose. Iyi nzira yekuyera kuomarara inoreva kukosha kwekuomarara kunowanikwa nekushandisa dhaimondi kupinda nepamusoro pemuenzaniso kuyera saizi yekumisikidza pasi pechimwe chimiro chemutoro. Rockwell kuomarara (HRA) imwe nzira inowanzoshandiswa yekuyera kuomarara. Iyo inoshandisa kudzika kwekupinda kweiyo mureza wedhaimani koni kuyera kuomarara. Zvese zviri zviviri kuomarara kweVickers uye kuomarara kweRockwell zvinogona kushandiswa kuyera kuomarara kwesimende carbide, uye izvo zviviri zvinogona kushandurwa kuita mumwe nemumwe.

Kupeta simba

Simba rekubhenda rinozivikanwawo sere transverse breaking simba kana flexural simba. Iyo yakaoma alloys inowedzerwa seyakareruka yekutsigira danda pamapivots maviri, uye ipapo mutoro unoiswa kune wepakati wepakati pepivots kusvika iyo yakaoma alloy kuputika. Mitemo yakaverengerwa kubva kune inotenderedza fomula inoshandiswa pamutoro unodiwa kuti utyoke, uye nzvimbo yekuyambuka-chikamu chemuenzaniso. Mune tungsten-cobalt alloys (WC-Co), simba rekushanduka-shanduka rinowedzera necobalt (Co) zviri mukati me tungsten-cobalt alloys, asi simba rekushandura rinosvika pakakwirira apo cobalt (Co) zvinyorwa zvinosvika 15%. Flexural simba inoyerwa neavhareji yezviyero zvakati wandei. Kukosha uku kuchasiyanawo neiyo geometry yemuenzaniso, mamiriro ekunze (kutsvedza), kushushikana kwemukati, uye hurema hwemukati hwechinhu. Nokudaro, simba rekushandura rinongova chiyero chesimba, uye flexural simba values ​​haigoni kushandiswa sechikonzero chekusarudza zvinhu.

Porosity

Cemented carbide inogadzirwa nehupfu metallurgy process nekutsikirira uye sintering. Nekuda kwechimiro cheiyo nzira, kuteedzera huwandu hweporosity hunogona kuramba huri mumetallurgical chimiro chechigadzirwa.

Iko kuderedzwa kweporosity kunogona kunyatso kuvandudza kushanda kwese kwechigadzirwa. Pressure sintering process inzira inoshanda yekudzikisa porosity.