Materials Weekly

Material Science and Engineering Blog

New materials industry, science, and technology information along with material production and application technology and material testing related knowledge and information

Try these high-end atmospheric grade structural characterization techniques

In recent research, the design and regulation of material properties by combining defect engineering is currently a research hotspot. In transition metal oxides, sulfides and other materials, the presence of defects will significantly change their electronic structure and chemical properties, thereby achieving their wide application in the field of energy storage and conversion. For example, in the structural design of battery materials, quantitative introduction of defects can improve the electrical conductivity of the material, provide more active sites, and improve the phase transition of the material during lithiation to achieve superior electrochemical performance. To this end, by observing and characterizing … Read more

Advantages and disadvantages of carbon fiber composites (CFRP)

CFRP composites are lightweight, sturdy materials that are widely used in the manufacture of a wide range of products used in our daily lives. Table of Contents What are carbon fiber composites(CFRP)?Advantages of carbon fiber compositesLightweightHigh strengthDisadvantages of carbon fiber compositesHigh costConductivity What are carbon fiber composites(CFRP)? A carbon fiber reinforced composite material, referred to as a carbon fiber composite material, refers to a fiber-reinforced composite material using carbon fiber as a main structural component. It should be noted that the “P” in the CFRP composite may represent not only “polymer” but also “plastic”. In general, thermosetting resins such as … Read more

The Introduction of Fatigue Test Methods

When a point of the component is subjected to a sufficiently large disturbance stress, a crack is formed after a sufficient number of cycles, and this phenomenon is called fatigue. Fatigue fracture is the main cause of failure of engineering structures and components. In the current application and research, there are four main types of fatigue testing methods: 1. Nominal stress and strain method; 2. Local stress and strain method; 3. Energy method; 4. Fracture mechanics method. This article briefly introduces the four types of methods and their applications. Table of Contents 1. Nominal stress method2. Local stress and strain … Read more

The Science of High-resolution Electron Micro-graphs

High resolution transmission electron microscopy (HRTEM or HREM) is the phase contrast (the contrast of high-resolution electron microscopy images is formed by the phase difference between the synthesized projected wave and the diffracted wave, It is called phase contrast.) Microscopy, which gives an atomic arrangement of most crystalline materials. High-resolution transmission electron microscopy began in the 1950s. In 1956, JWMenter directly observed parallel strips of 12 Å copper phthalocyanine with a resolution of 8 Å transmission electron microscope, and opened high-resolution electron microscopy. The door to surgery. In the early 1970s, in 1971, Iijima Chengman used a TEM with a … Read more

Aluminum alloy: the main force for manufacturing lightweight automobile

Automotive lightweight trend accompanied by aluminum alloy Figure 1. Changes in the average amount of aluminum used in European cars Today, the term “lightweight” has evolved from the terminology of the automotive industry to the high-frequency vocabulary in media news. In “Made in China 2025”, light weight has also been regarded as an important direction for the development of the automobile industry. To put it simply, light-weighting is to reduce the weight of the vehicle as much as possible while ensuring the strength and safety of the vehicle, thereby improving the vehicle’s power, reducing fuel consumption and reducing exhaust pollution. … Read more

The path of electrochemical capacitors – a strong complement in the energy field

The concept of capacitors has been around for a long time. It was first known as the Leiden bottle. Its prototype is a glass bottle containing a hydrolyzed acid dielectric. The conductor immersed in acid and the metal foil coated on the outside of the glass bottle serve as two electrodes. The glass in between is used as a dielectric material, as shown in Figure 1. Berker filed a patent in 1757, describing that the electrical energy in the primary cell is stored by the charge stored in the dual cell immersed in the aqueous dielectric porous carbon material interface. … Read more

Characteristics of Cemented Carbide

Cemented carbide is made of refractory metal hard compound (hard phase),which is generally a carbide, and metal binder (binding phase)obtained by powder metallurgy method,. As a hard alloy for cutting tools, the commonly used carbides are tungsten carbide (WC), titanium carbide (TiC), and tantalum carbide(TaC), niobium carbide (NbC), etc. The mostly used binder is Co. The strength of the cemented carbide depends mainly on the content of cobalt. Because of the high melting point,high hardness (see Table 1-1),good chemical stability,and good thermal stability that carbides in the cemented carbide have and the large amount of high-temperature carbon materials, the hardness … Read more

The Principle of Powder Sintering in Metallurgy

The so-called powder metallurgy method is to make a powder of the raw material of the alloy to be produced, and then mix the powders in an appropriate amount and pressurize and solidify into a certain shape. These powder pieces will be placed in a reducing atmosphere (for example, hydrogen), heated and sintered to form an alloy. This is a metallurgical method that is completely different from the previous casting method. The sintering referred to herein can be simply defined as the promotion of agglomeration of metal crystal grains by the action of pressurization and warming. We apply a certain … Read more

Choosing Material for Machining Stainless Steel is Difficult? Let’s Hear the Expert Tips

At present, stainless steel is widely used in industry such as aerospace, power generation equipment manufacturing, construction and food. As a typical hard-to-machine material, stainless steel has the defects of severe hardening during processing, high cutting temperature and easy adhesion of chips. Due to the above characteristics of stainless steel, common problems such as accelerated wear of the tool, poor integrity of the machined surface, and difficulty in chip removal are likely to occur during the machining process of STS, which seriously affects the processing quality, production cycle and processing cost of those material parts containing STS. Meetyou carbide tech … Read more

The working principle of ball mill

The ball mill consists of a metal cylinder and a ball. The working principle is that when the cylinder is rotated, the grinding body (ball) and the object to be polished (material) installed in the cylinder are rotated by the cylinder under the action of friction and centrifugal force. At a certain height, it will automatically fall and impact and grind the material in the cylinder to grind the material. In addition, the agitation of the ball will evenly mix the materials. Factors affecting ball milling efficiency, in addition to the structure of the ball mill. Mainly the rotation speed … Read more

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