{"id":13993,"date":"2020-04-29T08:55:28","date_gmt":"2020-04-29T08:55:28","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=13993"},"modified":"2021-10-11T06:08:04","modified_gmt":"2021-10-11T06:08:04","slug":"present-research-on-main-kinds-of-wc-based-composites","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/tr\/mevcut-ana-tur-wc-tabanli-kompozitler-uzerinde-arastirma\/","title":{"rendered":"WC Tabanl\u0131 Kompozitlerin Ana \u00c7e\u015fitleri \u00dczerine Mevcut Ara\u015ft\u0131rma"},"content":{"rendered":"

\u00c7imentolu karb\u00fcr, refrakter metalin ve yap\u0131\u015ft\u0131rma metalinin sert bile\u015fi\u011finden toz metalurjisi i\u015flemi ile yap\u0131lan bir t\u00fcr \u00e7imentolu karb\u00fcrd\u00fcr. \u0130yi sertli\u011fi ve mukavemeti nedeniyle, bir\u00e7ok alanda yayg\u0131n olarak kullan\u0131lmaktad\u0131r. Y\u00fcksek s\u0131cakl\u0131k performans\u0131 ve \u00e7imentolu karb\u00fcr malzemelerin korozyon direnci artt\u0131k\u00e7a, mevcut \u00e7imentolu karb\u00fcr malzemelerin performans\u0131n\u0131n kullan\u0131m gereksinimlerini kar\u015f\u0131lamak zordur. Son 30 y\u0131lda, bir\u00e7ok bilim adam\u0131 WC bazl\u0131 bile\u015fikler \u00fczerinde deneysel ara\u015ft\u0131rmalar ger\u00e7ekle\u015ftirmi\u015f ve bir dizi ara\u015ft\u0131rma sonucu elde etmi\u015ftir.<\/p>

WC metalleri<\/strong><\/strong><\/h2>

WC-Co<\/strong><\/strong><\/h3>

Tungsten karb\u00fcrde yayg\u0131n olarak kullan\u0131lan \u00e7imentolu malzeme kobaltt\u0131r. WC Co sistemi kapsaml\u0131 bir \u015fekilde incelenmi\u015ftir. CO ilavesi, WC'nin iyi \u0131slanabilirli\u011fe ve yap\u0131\u015fmaya sahip olmas\u0131n\u0131 sa\u011flar. Ek olarak, \u015eekil 13.2'de g\u00f6sterildi\u011fi gibi, CO ilavesi de mukavemeti ve toklu\u011fu \u00f6nemli \u00f6l\u00e7\u00fcde geli\u015ftirebilir.<\/p>

\"\"<\/figure>
\"\"<\/figure>

\u015eekil 13.3 D\u0131\u015f ve enine kesit yap\u0131lar\u0131 g\u00f6steren WC Co tozunun geri sa\u00e7\u0131l\u0131m elektron mikrograf\u0131: (a), (b) F8; (c), (d) M8; ve (E), (f) C8.<\/p>

F8, M8 ve C8 tozlar\u0131n\u0131n ve parlat\u0131lm\u0131\u015f b\u00f6l\u00fcmlerinin geri sa\u00e7\u0131l\u0131m elektron g\u00f6r\u00fcnt\u00fclemesini yapt\u0131. T\u00fcm tozlar\u0131n tipik k\u00fcresel bir \u015fekle sahip oldu\u011fu g\u00f6zlenmi\u015ftir. F8 tozu yo\u011fun ince karb\u00fcr birikimi g\u00f6sterirken, M8 ve C8 tozu baz\u0131 g\u00f6zeneklerle nispeten gev\u015fek bir birikim yap\u0131s\u0131 g\u00f6sterir. Cilal\u0131 b\u00f6l\u00fcmde, t\u00fcm numuneler belirgin sa\u00e7\u0131lma fenomeni g\u00f6sterir ve sertlik ve a\u015f\u0131nma direnci kobalt i\u00e7eri\u011fi ile ters orant\u0131l\u0131d\u0131r. Vickers sertli\u011fi (HV) 1500 ila 2000 HV30 aras\u0131nda de\u011fi\u015fir ve k\u0131r\u0131lma toklu\u011fu 7 ila 15 MPa M1 \/ 2 aras\u0131nda de\u011fi\u015fir. Bu \u00f6nemli de\u011fi\u015fiklik karb\u00fcr bile\u015fimi, mikro yap\u0131 ve kimyasal safl\u0131\u011f\u0131n bir fonksiyonudur.<\/p>

Genel olarak, partik\u00fcl boyutu ne kadar k\u00fc\u00e7\u00fck olursa, sertlik o kadar y\u00fcksek olur ve a\u015f\u0131nma direnci o kadar iyidir. CO'nun hacim fraksiyonu ne kadar y\u00fcksek olursa, k\u0131r\u0131lma toklu\u011fu o kadar y\u00fcksek olur, ancak sertlik ve a\u015f\u0131nma direnci o kadar d\u00fc\u015f\u00fck olur (Jia ve di\u011ferleri, 2007). Bu nedenle, daha iyi performans elde etmek i\u00e7in, bunun yerine di\u011fer \u00e7imentolu malzemeleri kullanmay\u0131 d\u00fc\u015f\u00fcnmek ka\u00e7\u0131n\u0131lmazd\u0131r.<\/p>

\u00d6te yandan, yukar\u0131daki nedenlerden dolay\u0131, stratejide bilimsel de\u011fildir ve fiyat e\u011filimini etkilemek kolayd\u0131r. Ek olarak, WC ve ko toz kombinasyonu endi\u015fe vericidir \u00e7\u00fcnk\u00fc herhangi bir tek kullan\u0131mdan daha \u00f6ld\u00fcr\u00fcc\u00fcd\u00fcrler.<\/p>

WC-Ni<\/strong><\/strong><\/h3>

Nikel, kobalttan daha ucuz ve elde edilmesi daha kolayd\u0131r. \u0130yi bir sertle\u015ftirme \u00f6zelli\u011fine sahiptir. Zorlu ortamlarda korozyon \/ oksidasyon performans\u0131n\u0131, y\u00fcksek s\u0131cakl\u0131k mukavemetini ve a\u015f\u0131nma direncini artt\u0131rmak i\u00e7in kullan\u0131labilir. WC Co ala\u015f\u0131m\u0131 ile kar\u015f\u0131la\u015ft\u0131r\u0131ld\u0131\u011f\u0131nda, malzemenin plastisitesi daha d\u00fc\u015f\u00fckt\u00fcr. Nikel WC'de iyi \u00e7\u00f6z\u00fcnd\u00fc\u011f\u00fcnden, WC substratlar\u0131 i\u00e7in bir yap\u0131\u015ft\u0131r\u0131c\u0131 olarak kullan\u0131l\u0131r, bu da aralar\u0131nda g\u00fc\u00e7l\u00fc bir ba\u011f ile sonu\u00e7lan\u0131r.<\/p>

WC-Ag<\/strong><\/strong><\/h3>

Ag ilavesi, WC'yi bir t\u00fcr ark diren\u00e7li malzeme haline getirir. A\u015f\u0131r\u0131 y\u00fck ak\u0131m\u0131n\u0131n etkisi alt\u0131nda, WC genellikle ikincisinin iyi bilinen elektrik temas direncine (RC) atfedilebilen anahtarlama cihazlar\u0131na y\u00fcklenir. WC Ag kompozitinin direncinin Ag i\u00e7eri\u011finin artmas\u0131yla azald\u0131\u011f\u0131n\u0131 ve Ag i\u00e7eri\u011finin artmas\u0131yla sertli\u011fin azald\u0131\u011f\u0131n\u0131 ve bu da WC ve Ag'nin sertli\u011fi aras\u0131ndaki b\u00fcy\u00fck farktan kaynakland\u0131\u011f\u0131n\u0131 belirtmek gerekir. Ek olarak, kaba WC taneleri \u00e7ok d\u00fc\u015f\u00fck ve kararl\u0131 temas direncine sahiptir.<\/p>

\u015eekil 13.4, anahtar taraf\u0131ndan \u00fcretilen ortalama elektrik temas direncini (RC) g\u00f6sterir<\/p>

Farkl\u0131 g\u00fcm\u00fc\u015f i\u00e7eri\u011fine ve WC par\u00e7ac\u0131k boyutuna sahip d\u00f6ng\u00fc 11e50, \u00e7\u00fcnk\u00fc \u00e7o\u011fu malzemenin RC'si 10 anahtarlama \u00e7evriminden sonra stabil olarak g\u00f6zlenir. G\u00fcm\u00fc\u015f\u00fcn temas direnci WC i\u00e7inde 50-55 wt% (hacim oran\u0131 60% ve 64.6%) aras\u0131nda ve 4 mm partik\u00fcl b\u00fcy\u00fckl\u00fc\u011f\u00fc ile WC i\u00e7inde 55-60 wt% (hacim oran\u0131 64.6% ve 69%) aras\u0131ndad\u0131r. 0.8 ve 1.5 mm. Bu nedenle, bu, Ag matrisinin tamamen birbirine ba\u011fl\u0131 oldu\u011fu yat\u0131r\u0131m\u0131n ilk kompozisyonunu belirler. Sabit bile\u015fenler i\u00e7in, ge\u00e7irgenlik e\u015fi\u011fini de belirten 1.5 ila 4 mm WC par\u00e7ac\u0131k boyutu aras\u0131nda temas direncinde bir azalma g\u00f6zlenmi\u015ftir.<\/p>

WC-Re<\/strong><\/strong><\/h3>
\"\"<\/figure>

Bilim adamlar\u0131, WC Co'dan daha iyi performans elde etmek i\u00e7in renyumunu g\u00fc\u00e7lendirmek i\u00e7in tungsten karb\u00fcr kullan\u0131yorlar, \u00e7\u00fcnk\u00fc RE y\u00fcksek s\u0131cakl\u0131k sertli\u011fi ve iyi kombinasyon getirebilir<\/p>

\u015eekil 13.4 Farkl\u0131 Ag i\u00e7eri\u011findeki ve WC partik\u00fcl boyutundaki ortalama elektrik temas direncinin, 11 ila 50 aras\u0131ndaki sikluslar s\u0131ras\u0131nda WC substrat\u0131n\u0131n temas direncine oran\u0131 ko veya Ni'dir. WC koerinin (20% RE i\u00e7eri\u011fi) mikroyap\u0131 \u00f6zelliklerine g\u00f6re, WC'nin CO'da tutuldu\u011fu ve HCP yap\u0131s\u0131 olu\u015fturmaya devam etti\u011fi, b\u00f6ylece ala\u015f\u0131m\u0131n sertli\u011finin art\u0131r\u0131ld\u0131\u011f\u0131 a\u00e7\u0131klanmaktad\u0131r. Ara\u015ft\u0131rmac\u0131lar ayr\u0131ca WC Ni'de yeniden g\u00fc\u00e7lendi ve benzer \u00e7\u0131kar\u0131mlar buldular. En y\u00fcksek sertli\u011fi ve WC Co'nun iki kat dayan\u0131kl\u0131l\u0131\u011f\u0131 nedeniyle, ala\u015f\u0131m rekabet\u00e7i tak\u0131m par\u00e7alar\u0131 \u00fcretmek i\u00e7in kullan\u0131l\u0131r. So\u011fuk presleme WC ve Re tozlar\u0131 ve ard\u0131ndan patentli bir s\u0131cak presleme i\u015flemi s\u0131ras\u0131nda, 2400 kg \/ mm ~ 2'den fazla HV g\u00f6zlendi (WC-Co i\u00e7in 1700 kg \/ mm ~ 2 ile kar\u015f\u0131la\u015ft\u0131r\u0131ld\u0131\u011f\u0131nda)<\/p>

WC intermetalikler<\/strong><\/h2>

WC-Feal<\/strong><\/h3>

Son birka\u00e7 on y\u0131ld\u0131r, seramik yap\u0131\u015ft\u0131r\u0131c\u0131lar olarak metaller aras\u0131 bile\u015fikler insanlar\u0131n dikkatini \u00e7ekti. Demir al\u00fcminidin m\u00fckemmel oksidasyon direnci ve korozyon direnci, d\u00fc\u015f\u00fck toksisite, y\u00fcksek sertlik, iyi a\u015f\u0131nma direnci, y\u00fcksek s\u0131cakl\u0131k stabilitesi ve iyi \u0131slanabilirli\u011fe sahiptir. Termodinamik olarak WC i\u00e7in ba\u011flay\u0131c\u0131 olarak uygundur. WC FeAl ve WC Co'nun sertli\u011fi ve k\u0131r\u0131lma toklu\u011fu temel olarak ayn\u0131d\u0131r. WC Co ala\u015f\u0131m\u0131n\u0131n sertlik ve a\u015f\u0131nma direnci, geleneksel WC Co ala\u015f\u0131m\u0131n\u0131n sertlik ve a\u015f\u0131nma direncine benzer. Tane boyutu optimize edilebilirse, geleneksel WC Co'nun yerini almak m\u00fcmk\u00fcnd\u00fcr. Farkl\u0131 bilyal\u0131 \u00f6\u011f\u00fctme ve \/ veya kurutma i\u015flemleri ile haz\u0131rlanan WC FeAl kar\u0131\u015f\u0131k tozunun partik\u00fcl boyutu da\u011f\u0131l\u0131m e\u011frisi \u015eekil 13.5'te g\u00f6sterilmi\u015ftir. \u015eekil 13.5'teki \u00fc\u00e7 e\u011fri bimodal da\u011f\u0131l\u0131ma sahiptir. \u015eekil 13.5'te, daha k\u00fc\u00e7\u00fck par\u00e7ac\u0131k boyutunun sol zirvesi, tek bir WC par\u00e7ac\u0131\u011f\u0131n\u0131n sol zirvesine kar\u015f\u0131l\u0131k gelir. Daha b\u00fcy\u00fck partik\u00fcl boyutunun do\u011fru pik de\u011feri, baz\u0131 WC partik\u00fclleri i\u00e7eren FeAl fragmanlar\u0131n\u0131n pik de\u011ferine kar\u015f\u0131l\u0131k gelir. Do\u011fru pik hareket etti\u011finde, sol pik ta\u015flama ve \/ veya kurutma i\u015flemine ba\u011fl\u0131 de\u011fildir. DR tozunun do\u011fru zirvesi (h\u0131zl\u0131 kurutma i\u00e7in \u00e7\u00f6z\u00fcc\u00fc olarak susuz etanol) di\u011fer iki tozun kar\u015f\u0131l\u0131k gelen zirvesine ge\u00e7er.<\/p>

\"\"<\/figure>

\u015eekil 13.5 \u00c7e\u015fitli toz i\u015flemlerinden haz\u0131rlanan WC-FeAl kar\u0131\u015f\u0131k tozlar\u0131n\u0131n par\u00e7ac\u0131k boyutu da\u011f\u0131l\u0131mlar\u0131.<\/p>

WC-seramik<\/strong><\/strong><\/h2>

WC-MgO<\/strong><\/strong><\/h3>
\"\"<\/figure>

Wc-mgo kompozit malzemeler, sertlik \u00fczerinde \u00e7ok az etkisi olan ve malzemelerin toklu\u011funu \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131ran WC matrisine MgO par\u00e7ac\u0131klar\u0131n\u0131n eklenmesi nedeniyle yayg\u0131n olarak kullan\u0131lmaktad\u0131r. Sertlik tokluk ile ters orant\u0131l\u0131d\u0131r, ancak bu ala\u015f\u0131m durumunda sertlik kayb\u0131 \u00e7ok k\u00fc\u00e7\u00fck oldu\u011funda tokluk elde edilir. \u0130ncelenen malzemeye az miktarda VC, Cr3C2 ve di\u011fer tah\u0131l b\u00fcy\u00fcme inhibit\u00f6rleri eklemek, sadece sinterleme i\u015flemindeki tane b\u00fcy\u00fcmesini kontrol etmekle kalmaz, ayn\u0131 zamanda malzemenin mekanik \u00f6zelliklerini de geli\u015ftirir.<\/p>

WC-AI2O3<\/strong><\/strong><\/h3>

Burada Al2O3'\u00fcn m\u00fckemmel mekanik ve fiziksel \u00f6zellikleri nedeniyle WC i\u00e7in takviye malzemesi olarak kullan\u0131ld\u0131\u011f\u0131 ve bunun tersi de belirtilmelidir.<\/p>

Sinterleme s\u0131cakl\u0131\u011f\u0131 ve bekletme s\u00fcresi, wc-40vol% Al2O3 kompozitinin mikroyap\u0131s\u0131 ve mekanik \u00f6zellikleri \u00fczerinde \u00f6nemli etkilere sahiptir. Sinterleme s\u0131cakl\u0131\u011f\u0131 ve tutma s\u00fcresinin artmas\u0131yla, nispi yo\u011funluk ve par\u00e7ac\u0131k boyutu artar. Ayn\u0131 zamanda, y\u00fcksek bas\u0131n\u00e7 ve k\u0131r\u0131lma toklu\u011fu de\u011ferleri \u00f6nce artar ve sonra azal\u0131r. \u00c7atlak yolunun mikro yap\u0131s\u0131, \u00e7atlak k\u00f6pr\u00fcleme ve \u00e7atlak sapmas\u0131n\u0131n varl\u0131\u011f\u0131n\u0131 ortaya koymaktad\u0131r. Wc-40vol% Al 2O3 kompozitlerinde, ana sertle\u015ftirme mekanizmas\u0131 sekonder ve lateral \u00e7atlaklar\u0131n \u00fcretilmesidir. Ba\u015fka bir \u00e7al\u0131\u015fma, HV'nin yakla\u015f\u0131k 20e25 gpa oldu\u011funu ve k\u0131r\u0131k toklu\u011funun 5e6mpa.m1 \/ 2 oldu\u011funu g\u00f6stermektedir.<\/p>

\u015eekil 13.6, sertlik, k\u0131r\u0131lma toklu\u011fu ve enine k\u0131r\u0131lma mukavemetinin al\u00fcmina i\u00e7eri\u011fi ile de\u011fi\u015fim e\u011filimini g\u00f6stermektedir. Bu de\u011ferlerin rapor edilenlerden olduk\u00e7a farkl\u0131 oldu\u011funa dikkat edilmelidir (Mao ve ark., 2015). Saf WC en y\u00fcksek sertli\u011fe ve en d\u00fc\u015f\u00fck k\u0131r\u0131lma toklu\u011funa sahiptir. Al2O3 eklenmesi k\u0131r\u0131k toklu\u011funu artt\u0131r\u0131r, ancak saf al\u00fcmina sertli\u011fi saf WC'den daha d\u00fc\u015f\u00fckt\u00fcr ve wc-al2o3 kompozitinin sertli\u011fi azal\u0131r. \u015eekil 13.6'daki farkl\u0131 sonu\u00e7lar, mekanik \u00f6zelliklerin sadece al\u00fcmina i\u00e7eri\u011fine de\u011fil, ayn\u0131 zamanda farkl\u0131 substratlar\u0131n \u00fcretim s\u00fcrecine ve derecesine de ba\u011fl\u0131 oldu\u011funu g\u00f6stermektedir. <\/p>

WC a\u015f\u0131nd\u0131r\u0131c\u0131lar<\/strong><\/strong><\/h2>

WC cBN<\/strong><\/strong><\/h3>

CBN m\u00fckemmel sertli\u011fe, termal stabiliteye ve demir ile reaksiyon aktivitesine sahip oldu\u011fundan, WC Co'ya CBN eklenmesi malzemenin a\u015f\u0131nma direncini, sertli\u011fini ve mekanik \u00f6zelliklerini geli\u015ftirebilir. CBN, WC matrisine g\u00fc\u00e7lendirildikten sonra, g\u00fc\u00e7l\u00fc yap\u0131\u015fma \u00fcretilecektir. Ek olarak, \u00e7atlak sapmas\u0131 veya CBN partik\u00fcllerinin k\u00f6pr\u00fclenmesi ile daha iyi k\u0131r\u0131k toklu\u011fu elde edilebilir. CBN ilavesi s\u00fcrecindeki iki ana engel, CBN'den hBN'ye d\u00f6n\u00fc\u015f\u00fcm ve B ve N aras\u0131ndaki g\u00fc\u00e7l\u00fc kovalent ba\u011fd\u0131r, bu da CBN ve semente karb\u00fcr\u00fcn d\u00fc\u015f\u00fck sinterleme kabiliyeti ile sonu\u00e7lan\u0131r.<\/p>

WC elmaslar<\/strong><\/strong><\/h3>

WC elmas m\u00fckemmel k\u0131r\u0131lma toklu\u011funa, \u00e7atlak b\u00fcy\u00fcme direncine ve yans\u0131ma direncine sahiptir. Bu malzeme, elmas\u0131n grafite d\u00f6n\u00fc\u015fmesini \u00f6nlemek i\u00e7in sadece termodinamik ko\u015fullar alt\u0131nda \u00fcretilebilir. Bu malzemenin performans\u0131n\u0131 art\u0131rmak i\u00e7in daha fazla ara\u015ft\u0131rma yaparak, \u00e7ok gerekli olan b\u00fcy\u00fck maliyet bo\u015flu\u011funu olu\u015fturabiliriz.<\/p><\/div>","protected":false},"excerpt":{"rendered":"

Cemented carbide is a kind of cemented carbide which is made by powder metallurgy process from the hard compound of refractory metal and bonding metal. Because of its good hardness and strength, it is widely used in many fields. With the requirement of high temperature performance and corrosion resistance of cemented carbide materials getting higher…<\/p>","protected":false},"author":2,"featured_media":13997,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[79,1],"tags":[],"class_list":["post-13993","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-materials-weekly","category-uncategorized"],"jetpack_featured_media_url":"https:\/\/www.meetyoucarbide.com\/wp-content\/uploads\/2020\/04\/\u56fe\u72472-7.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/tr\/wp-json\/wp\/v2\/posts\/13993","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.meetyoucarbide.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.meetyoucarbide.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/tr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/tr\/wp-json\/wp\/v2\/comments?post=13993"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/tr\/wp-json\/wp\/v2\/posts\/13993\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/tr\/wp-json\/wp\/v2\/media\/13997"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/tr\/wp-json\/wp\/v2\/media?parent=13993"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/tr\/wp-json\/wp\/v2\/categories?post=13993"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/tr\/wp-json\/wp\/v2\/tags?post=13993"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}