According to various of the technical difficulties such as low drilling efficiency in hard rock and short service life of diamond drilling bit, analysis was made on the inherent links between blade-extruding of hot-pressing diamond and rock abrasiveness.

中文摘要：針對在堅(jiān)硬致密巖石中鉆進(jìn)時(shí)效低和鉆頭使用壽命短的技術(shù)難題亚欧大尺度无码视频在线观看，分析了熱壓鉆頭的金剛石出刃與巖石研磨性等巖性之間的內(nèi)在聯(lián)系91手机最新国精品自产拍不卡，認(rèn)為鉆頭的胎體成分及其性能是關(guān)鍵，硬而帶脆性的胎體性能有利于金剛石出刃老外美女视频A片，從而能提高鉆進(jìn)速度1024手机看电影一区乳。

Effect of diamond grits as an additive on Ni-Al SHS reaction process was studied. The morphology of reaction products as well as the surface morphologies and the compressive strength of diamond after reaction were investigated.

本研究主要針對Ni-Al自蔓延反應(yīng)燃燒過程和加入金剛石磨料后的變化，其反應(yīng)產(chǎn)物的微觀形貌国内自拍区在线下载视频免费观看网址，以及SHS反應(yīng)后金剛石的表面特征及強(qiáng)度的變化進(jìn)行的探討国产福利AV在线导航。

We mainly wholesale diamond saw blades, polishing pads,diamond cup wheel,electric tools,archaize slab brush,stone protection and other special stone tools.

批發(fā)銷售金鋼石鋸片、軟磨片亚洲综合在线五月婷婷、地板翻新片性色生活毛片免费无码观看、磨輪无码亚洲成a人片在线观看无码、電動工具、防古刷及防護(hù)劑等石材專業(yè)用品及工具欧美99精品免费久久看。

If you want to wear a diamond for astrological reasons a diamond ring appears to be the best option.

如果你想穿的鉆石戒指鉆石召開航天原因似乎是最佳的選擇国产就是干在线。

Although clad diamond prevent iron family elements from eroding diamond and improve the strength between matrix and diamond, there still are many problems in applying Fe-base formulae. After the adding amount of reinforced elements is determined, the effect of the basic elements of matrix on its comprehensive performance is studied. The results show that while wc content is 15%. Fe/Ni 1: 1, 663-Cu etc 50%, Sintering temperature 920℃, temperature kept time 1. 5 mintues, matrix comprehensive preformance is best.

盡管金剛石表面鍍膜隔絕了鐵族元素對金剛石的侵蝕和提高了胎體對金剛石的粘結(jié)強(qiáng)度，但以Fe代Co還存在胎體的綜合機(jī)械性能等問題国产激情在线123，本文試著從材料學(xué)的強(qiáng)化理論出發(fā)確定了微量元素的添加量之后≡级片免费看，用正交試驗(yàn)設(shè)計(jì)方法研究了胎體的基本組元WC、Fe/Ni在限福利影院、663—Cu的加入量及燒結(jié)工藝對胎體綜合機(jī)械性能的影響国产九一视频在线观看，得出在WC15%，F(xiàn)e/Ni1：1亚洲鲁在视频在线观看，663—Cu等其它為50%AAA亚洲无码高清，燒結(jié)溫度920℃，保溫時(shí)間為1.5分時(shí)胎體的綜合機(jī)械性能最優(yōu)精品国产国语对白A…V。

By deciphering the natural, historical and cultural mystery concerning night-shining jewel and proposing archaeogeological theory and methods regarding diamond exploration, both for the first time in the international academic communities, and by taking night-shining jewel that was interpreted as large diamond as an example, the author has already demonstrated in 2004 that the history of development and utilization of large diamond in China can be traced back to the period of Emperors Yu, Shun, Yao 4000 years ago, and even further to the period of Emperor Yan 4500 years ago.

通過在國際學(xué)術(shù)界首次破解夜明珠這一世界性的自然色哟哟在线资源国产精品、歷史、文化千古之謎和首次創(chuàng)立金剛石考古地質(zhì)學(xué)的理論和方法特黄把女人弄爽又粗又大A片，以夜明珠就是中國古代巨粒金剛石為例日韩在线精品福利网页视频，證明了中國巨粒金剛石開發(fā)利用的歷史可以一直追溯到4000年前的禹舜堯時(shí)期甚至4500年前的神農(nóng)炎帝時(shí)期。

Kyoko Shimamura led a low diamond, ducked to South's jack. But Kazuko Banno played another diamond, so declarer Wang Wenfei won with dummy's ace and led the club queen. North took the ace and tried a third diamond, declarer ruffing and leading the heart queen.

北家低引一個方塊国产成熟女人性满足视频，在西家位置的莊家王文霏欧美最强XXXX性受，用明手的 DA 停住，并且打出梅花皇后CQ欧美A∨视频一中文字幕，北家CA吃進(jìn)国产经典露出偷窥91图片专区，試圖打第3輪方塊，遭到莊家將吃天天日日日干，然后莊家打出紅心皇后 HQ

By applying the technologies of diamond brazing and orientation of the diamond grains to the beads' manufacturing, the diamond wire saw can be used in some special area as its high cutting efficiency. And it will have very important meaning to developing wire saw with minor diameter beads as used to cutting precious materials.

其金剛石分布更為均勻爱鲁鲁在线视频免费观看，合金燒結(jié)密度更加合理；串珠金剛石釬焊技術(shù)和金剛石定向排布技術(shù)的應(yīng)用国产精品999视频，因其切割的高效率在一些特定的領(lǐng)域得到了很好的推廣欧美娇小性XXXXBBBB；小直徑串珠的開發(fā)成功，對珍貴材料的切割有著十分重要的意義真实破处。

Get the lowest prices on diamond wedding bands, diamond post earrings, diamond promise rings, and more.

最低的價(jià)格獲取鉆石結(jié)婚戒指日韩三级黄色A片，鉆石耳環(huán)后，承諾鉆石戒指人人操人人鲁操肉肉，等等亚洲日本久久。

Get the lowest prices on diamond wedding bands, diamond post earrings, diamond promise rings, and more.

獲取鉆石婚戒最低的價(jià)格，鉆石耳環(huán)后，鉆石戒指的承諾日韩A片无码毛片免费视频，等等毛片免费精品99。