The effect of the tool composition on the friction and wear behavior was investigated,and the morphologies of the rake face and rear face of the tool cutting the steel in air and nitrogen were observed on a scanning electron microscope. It was found that the Al_2O_3/TiB_2 tool was dominated by adhesive and abrasive wear in low speed dry cutting; while in high speed dry cutting,the tool was characterized by oxidation wear. An oxide layer of TiO_2 was formed by way of the oxidation of the reinforcing agent TiB_2 at a very much high cutting temperature, which contributed to greatly reducing the friction coefficient and increasing the antiwear life of the tool.Such a friction-reducing and antiwear behavior of the oxide layer was enhanced with increasing content of TiB_2 in the tool composite. However,the tool showed a relatively poorer wear resistance in N_2 than in air, because N_2 acted to retard the oxidation of the TiB_2 and the formation of the oxide layer on the tool rake face.

結(jié)果表明：低速干切削時欧美视频小说在线观看，Al2O3/TiB2陶瓷刀具的磨損機制主要表現(xiàn)為粘著磨損和磨料磨損幸福宝app官网大全；而在高速干切削時老乱女中文字幕熟女熟妇，刀具的磨損機制主要表現(xiàn)為氧化磨損91三级片在线，刀具表面經(jīng)由氧化反應(yīng)生成具有潤滑作用的反應(yīng)膜而起到固體潤滑作用国产每日，從而使刀具的耐磨性能提高在线A级网站，隨著TiB2含量和切削速度的增加，反應(yīng)膜的減摩抗磨作用增強男人插女人b动态图；而在切削區(qū)通入氮氣時一级欧美一级日韩α片，由于刀具表面氧化膜形成受阻，刀具的抗磨能力有所降低久久亚洲精品国产。

Inhibitor is a chemical species or admixture, which exists in the medium and can prevent from corrosion or retard corrosion. It is an effect method to use inhibitor to prevent metals and its alloys corrosion in environmental medium.316L stainless steel is an austenitic stainless steel consisting molybdenum, and its corrosion resistance was improved much than normal stainless steel.

緩蝕劑是一種以適當?shù)臐舛群秃托问酱嬖谟诃h(huán)境中時黄色视频精品在线观看网站，可以防止或減緩腐蝕的化學(xué)物質(zhì)或幾種化學(xué)物質(zhì)的混合物我不卡在线一区二，合理使用緩蝕劑是防止金屬及其合金在環(huán)境介質(zhì)中發(fā)生腐蝕的有效方法。

Place sporocarps into waxed paper bags or wrap in waxed paper to retard drying (avoid plastic bags because sporocarps deteriorate rapidly in a "non-breathing" container).

將孢子果裝於蠟紙袋中18岁免费黄，以減緩乾燥(避免用塑膠袋丁香五月综合四月，因為孢子果在無法呼吸的容器中，會快速劣化)久久国产老熟女俱乐部。

You retard Misery, MYM got raped 4-1 by EHOME at scrims and you fnatic players hav to offer your inflated balls to the devil everytime you play vs MYM to win.

燒餅Miseryh在线观看视频免费，MYM在訓(xùn)練賽里被EHOME以4-1蹂躪了，而你們Fnatic每次與MYM打比賽時都把菊花準備好了給別人虐美国大片一级又大又粗的黑人。

The C-V profiles display two well-separated sharp peaks that are originated from the ground and excited states of the QDs, respectively , suggesting an improved uniformity and decreased dot density. The addition of Sb can retard the 3D growth mode and expand the critical thickness of the growth mode from 2D to 3D.

GA区手机在线看黄色视频。比值從0.6937提升至1.2102與光性分析有相同趨勢，半高寬有下降趨勢顯示隨Sb增加量子點有較均勻的現(xiàn)象正在播放近国产乱伦；在Sb含量最多的樣品發(fā)現(xiàn)中文字幕日本乱码精品久久，隨著量測頻率下降基態(tài)的濃度有明顯增加的趨勢(2×1017增加至2.15×1019)，使的基態(tài)峰值顯得更陡峭国产在线A∨，由於可以在電性明顯的量測出基態(tài)的變化亚洲综合色区中文字幕，是因為量子點密度低與均勻度好的原因，這個結(jié)果與之前的分析有相同趨勢婷婷精品国产精品亚洲。

The aim of the experiments is to develop a kind of compound quality improver which can effectively retard the aging of sticky rice products with modified starch, emulsifier and food gum.

該試驗旨在以變性淀粉国产精品色哟哟无码、乳化劑、食用膠為原料看个毛片，研制一種能有效延緩糯米糕團老化回生的品質(zhì)改良劑日韩A片网站。

Blow dry damage can be prevented by using products containing glycerin and propylene glycol because these actives retard water evaporation.

吹干頭發(fā)的損傷是可以通過使用一些含有甘油和丙烯乙二醇的產(chǎn)品來預(yù)防的，因為這些有用的成分可以減緩頭發(fā)的水分流失欧美乱伦视频。

However, small number recent studies have indicated that overpressure will retard the clay mineral transformations and enhance the activity energy of kinetic reactions.

然而新近的一些研究表明18岁以下禁止进入黄色网站，超壓可以抑制粘土礦物的轉(zhuǎn)化，增加反應(yīng)活化能超碰人人99。