tacco,硬质合金刀与钨钢哪个硬度高？

硬质合金分类： 第一是碳化钨基硬质合金：包括 WC—Co、WC—TaC—Co、WC—TiC—Co、 WC—TiC—TaC—Co、WC—Ti—TaC—NbC—Co 等合金，这些合金均以碳化钨为主 成份tacco。

其次：碳化钛基或碳氮化钛基硬质合金，通常以 TiC 或 Ti（C、N）为基础成份， 以 Ni—Mo 作粘结剂而组成的一种硬质合金。第二： 碳化铬基硬质合金。以 Cr3C2 为基，以 Ni 或 Ni—W 等作粘结剂而组成的硬 质合金，通常用来作耐磨耐腐蚀零件，近几年还大量用于装饰品部件如表链等。第三：钢结硬质合金：以 TiC 或 WC 为基，钢作粘结剂而组成的一种硬质合金， 是一种可进行机加工和热处理的合金， 第四：涂层硬质合金，通常指在韧性的碳化钨基硬质合金基体上通过化学气相 沉积或物理涂层方法，涂上几微米厚的 TiC、TiN、Ti（C、N）、Al2O3 之类的硬 质化合物而生产的 如果真好比较，钨钢是属于钢，硬质合金刀具是用来加工钢件的，所以当然前者硬。

请教:如何选硬质合金牌号？

这个简单啊，碳化钨粉末（WC）加粘结金属钴粉还有TiC和TaC粉末烧结而成，不同的成分比例对应不同的牌号。（1）钨钴类（WC+Co）硬质合金（YG） 它由WC和Co组成，具有较高的抗弯强度的韧性，导热性好，但耐热性和耐磨性较差，主要用于加工铸铁和有色金属。细晶粒的YG类硬质合金（如YG3X、YG6X），在含钴量相同时，其硬度耐磨性比YG3、YG6高，强度和韧性稍差，适用于加工硬铸铁、奥氏体不锈钢、耐热合金、硬青铜等。 （2）钨钛钴类（WC+TiC+Co）硬质合金（YT） 由于TiC的硬度和熔点均比WC高，所以和YG相比，其硬度、耐磨性、红硬性增大，粘结温度高，抗氧化能力强，而且在高温下会生成TiO 2,可减少粘结。但导热性能较差，抗弯强度低，所以它适用于加工钢材等韧性材料。 (3)钨钽钴类（WC+TaC+Co）硬质合金（YA） 在YG类硬质合金的基础上添加TaC(NbC),提高了常温、高温硬度与强度、抗热冲击性和耐磨性，可用于加工铸铁和不锈钢。 （4）钨钛钽钴类（WC+TiC+TaC+Co）)硬质合金(YW) 在YT类硬质合金的基础上添加TaC(NbC),提高了抗弯强度、冲击韧性、高温硬度、抗氧能力和耐磨性。既可以加工钢，又可加工铸铁及有色金属。

介绍新疆500字英语作文

” We Xinjiang good place, good grazing land of North and south of the Tianshan mountains, … … Melons and fruits, cattle and sheep … In former days desolate sands becomes fertile land …” Many people are familiar with this song, this song of praise home whenever music sounded in the ears, I will be full of passion, for their own people are proud of Xinjiang.

Xinjiang area of 1660000 square meters, population 16600000, is China’s largest administrative area of the province. The eastern and southern Gansu, Qinghai and Tibet are the provinces connect, northeast and Mongolia people’s Republic of China and Russia, adjacent, West Kazakhstan, Kyrgyzstan, Tajikistan border, southwest, Pakistan, adjacent to India and afghanistan. Xinjiang is a temperate continental climate, four distinct seasons, with hot summers, cold winters, wind. Xinjiang is not only rich animal and plant resources, but also many kinds of mineral resources, has been found in 13, accounting for the total number of 80%, ranking second in the country. The proven reserves of mineral: Muscovite, sodium nitrate, clay, vermiculite and other mineral products ranks first in the country, in addition to the rich iron, manganese, chromium, tantalum, cesium, magnesite, cement limestone, brick of clay and stone diabase stone, 18 estate in the northwest region of the first.

Xinjiang region is vast, grassland area, grassland types. Northern prairie green, white, red horse, yurt ( Mongolia ) and the blue sky and white clouds gain by contrast, walk in” green carpet”, a breath of fresh air, feel a deep sense of style, so that people have a dust removal to the common sense of return to nature.

Tianshan scenery are drunk, abundant surprise! Picturesque scenery lush grass, forest lake legend much! The Tianshan mountains across central Xinjiang, Xinjiang will be divided into southern and northern. Many in the desert, lack of water, but is rich in mineral resources, Aletai gold, Hotan jade is the famous. Northern Tianshan snow in adequate irrigation, land is fecund, fertile land throughout, Yili was one of the famous Valley, is rich land of plenty, Yili wines with 10000, the fruits of Yili full of sweet, Yili River carp fresh taste!

Xinjiang due to abundant sunshine, the temperature difference is big, the fruit varieties, taste good. Yecheng Kuche Turpan apricot, pomegranate, grapes, Hami melon, Korla pear people praise, Dabancheng watermelon big and sweet, where the girl is beautiful!

Xinjiang is one of the many cultural relics, natural landscape, rich and colorful ethnic customs of the place, already became our country western the attractive tourist resort. Tianshan Tianchi water Ying the Xuefeng trees reflection, scene is beautiful, lush grass, the romantic flowers. Bai Zi Crick is the earliest Thousand-Buddha cave dug the earth temple. There is a typical Islamic style of tomb building Xiangfei mu, known for its history of Kroraina ancient ruins, legend of the Flaming Mountains, Turpan’s big Grape Valley, mysterious, nano wire lake, connected Tianshui Sailimu Lake, known as ” the father of glaciers” Mu Shita peak, Tarim Populus, taccola Ma Gan desert … …

Xinjiang, in many people’s mind, always with a savage, backward, mysterious, and desolate to equate. I in the south, many people heard I from Xinjiang, is curious and asked me:” you are from Xinjiang? I hear there’s people are very fierce, go carrying daggers?” ” You live in the tent? There is in Gobi? There a bowl to drink, grabbing chunks of meat to eat?” After listening to these questions, I would always laugh and tell them:” the people of Xinjiang did not you say so terrible, although customs vary slightly, but the people there are very warm, hospitable, honest folkway and let them love with bowls of wine and mutton to welcome the guests from afar! People do not make me, I do not prisoners, they won’t easily play rough. Now in addition to nomadic people in the Tianshan Mountains, Xinjiang people living in tents in the many-storied buildings, has become a fresh tool. Now the Xinjiang oasis is spread all over, past Gobi into today’s green field! Everywhere is the beautiful scenery, the rapid development of the tourism industry, to the tourists attraction.”

If I have the chance to travel in Xinjiang, you will find the girls here although unlike southern woman so handsome gentle, quiet as water; and unlike the Shandong woman as beautiful and generous, lively and lovely; but Xinjiang woman northerners have rough bold, dye-in-the-wood game, there are people in the south, and versatile, but also the characteristics of their own — pure refined, like the Tianshan snow lotus flower on the ice, a cedar tree, prairie flower on the Ge Sanghua mountain stream, a clear spring. ” In the distant place, there is a good girl” with a whip, catch a sheep from the clouds blowing, her passionate eyes, charming smile, whether or not you deeply? If you are still single, then the heartbeat as action, come on, Xinjiang beautiful woman waiting for you!

Today’s Xinjiang in the great western development strategy under the guidance of the right, the rapid economic development, increasing people’s standard of living, the appearance of a city change rapidly, has gradually become a bright pearl in the western. Everyone loves his hometown, everyone will boast of his home, I was no exception. Through many places, see a lot of scenery, native place in my heart always ranked in the first place, the home landscape trees of love, will never change! Wherever I go, I always think of my hometown – Xinjiang is the most beautiful! You don’t believe himself to have a look!