碳化物

Crack reasons for this are: the heating temperature is too high as a result of quenching or cooling in a hurry, the quality of thermal stress and metal volume changes in the organization of the anti-stress than the breaking strength of steel; the work of the original surface defects (such as surface micro-cracks or scratches) or the internal defect of steel (such as slag, serious non-metallic inclusions, white point, the residual cavity, etc.) formed in the quenching stress concentration; serious Decarburization and carbide surface segregation; parts after quenching Back lack of timely or tempering fire; processes in front of the stress caused by excessive cold red, forging folding, turning deep marks, sharp edges and corners, such as the oil groove.

造成这种裂纹的原因有：由于淬火加热温度过高或冷却太急，热应力和金属质量体积变化时的组织应力大于钢材的抗断裂强度；工作表面的原有缺陷或是钢材内部缺陷（如夹渣、严重的非金属夹杂物、白点、缩孔残余等）在淬火时形成应力集中；严重的表面脱碳和碳化物偏析；零件淬火后回火不足或未及时回火；前面工序造成的冷冲应力过大、锻造折叠、深的车削刀痕、油沟尖锐棱角等。

After hot pressing at 1800℃, carbides and silicides were formed in interfacial layers because W, Ta reacted with SiC.

在1800℃热压烧结过程中，金属W、Ta与SiC反应生成了碳化物与硅化物，未能形成塑性金属层。

But when Fe/D113 precursor is pyrolysed in the range of 400-700℃, the crystal structure of the iron particle is different. The products are mainly iron oxides andα-Fe as Fe/D113 precursor pyrolysed at 500℃, and as the pyrolytic temperature increases to the range of 600-700℃,α-Fe and Fe_3C are observed. Meanwhile, Al_2O_3、MgO、MgAl_2O_4 were observed in Al/C, Mg/C, Al-Mg/C which were prepared from D113 resin at 1000-1300℃.

而在同样的条件下热解载铁树脂(Fe／D113)，热解产物中铁的晶体结构与热解温度有关，400℃热解产物为铁的氧化物；500℃热解产物为体心立方结构的单质铁；600-700℃的热解产物为bcc单质铁和铁的碳化物(Fe_3C)。1000-1300℃热解含Al、Mg及Al-Mg的D113树脂制得的Al／C、Mg／C、Al-Mg／C材料中Al、Mg主要以Al_2O_3、MgO、MgAl_2O_4形式存在。

Improvement and modification of traditional metal sulphide catalysts, and the current situation of new catalysts such as metal carbides, metal nitrides and metal phosphides are emphasized.

着重概述了传统金属硫化物催化剂的改性方法，新型的金属碳化物、金属氮化物和金属磷化物催化剂的研究现状。

In this thesis, a first principles study of the electronic properties and mechanical properties of transition metals, transition metal carbide s and nitrides is presented.

过渡金属碳化物和氮化物具有高硬度、高熔点、耐磨损和耐腐蚀的优良特性，被广泛应用于切削刀具和用作硬质涂层。

Zhuzhou jiangwu Boda Hard-facing materials Co.,Ltd mainly froducts for Thermal Spray Powder, Refractory Metal Powder, Refractory Metal Carbide Powder,Welding Alloys, and other new materials.

株洲江钨博大硬面材料有限公司主要产品为热喷涂粉末、难熔金属粉末、难熔金属碳化物、焊接合金等新型材料，拥有自营进出口权。

In this paper we have studied four different Methods of heat treatment for CrWMn tool steel.

本文对于CrWMn冷作模具钢的4种不同预处理方法，对它们的碳化物粒子尺寸和分布、钢的奥氏体晶粒度大小及强韧化效果进行了对比。

Applications concerned herein were: the broken through tech in control rolling and control cooling of bar and wire steel, UFC of bearing steel after rolling to control carbide distribution, UFC of hot rolling sheet steel for complex phase control, reforming of hot rolling sheet steel mill performing UFC and the establishment of new cooling system of heavy and medium plate mill strengthened with UFC.

这些应用包括棒线材控轧控冷技术突破和应用、轴承钢的轧后超快速冷却控制碳化物分布、利用超快速冷却技术进行热轧带钢组织复相化控制，以及热轧带钢轧机实施超快速冷却装置的改造和中厚板轧机实施超快速压力喷射式冷却+ACC的新式冷却系统的建立。

Adding strong-carbide-formation elements to Ni-based self-fluxing alloy powder,composite coatings were obtained,which were reinforced by in-situ synthesized particles on CrCuB alloy gray iron substrate by laser cladding.

针对车用内燃机排气门座圈高温、高交变应力和高腐蚀性工况，采用添加了强碳化物形成元素的镍基自熔合金粉末，通过激光熔覆，在CrCuB合金灰铸铁基体上制备了原位合成的颗粒增强镍基复合涂层。

Molina and Rowland have proved that chlorine is the cause of damages to the ozone layer: When man-made fluorocarbons are used in products (including aerosol cans, refrigerants, or blowing agent for foam plastics), they will be released to the atmosphere.

马利纳和罗蓝得证实氯为破坏臭氧层的元凶：人造的氟氯碳化物会在产品（包括喷雾罐、冷气机冷媒或泡绵的发泡剂等）使用时，被排放至大气中。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。