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Microwave Sintering Introduction

Posted on: 三月 8th, 2017 by langfeng No Comments

Microwave Atmosphere Sintering Furnace

Sintering is a thermal process in which powder is transformed into a dense material without pores. in the last 50 years, microwave sintering has seen a wide range applications, such as the heating of food, drying of paper, textile and wood,etc. only in the last two decades has microwave energy been increasingly applied in the area of materials, including ceramics, composites and metals. Microwave sintering is a new type of powder metallurgy sintering densification process. Microwave sintering is the use of microwave heating to sintering the material. It is different from the traditional way of heating. Conventional heating is to rely on the heating element to transfer heat energy through convection, conduction or radiation to the heated sintered compact to reach a certain temperature, heat from outside to inside, sintering time is long. And microwave sintering is the use of microwave with a special band and the basic structure of the material coupled to produce the basic heat, the material dielectric loss of the material as a whole heated to the sintering temperature and achieve densification method.

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microwave heating advantage:volumetric heating

Posted on: 二月 28th, 2017 by langfeng No Comments

During microwave heating, electromagnetic energy is converted to thermal energy within the sample; the mechanism is therefore essentially one of energy conversion, not just heat transfer. When microwaves penetrate and are converted to thermal energy within the material, heat energy is generated throughout the volume of the material; this results in volumetric heating and rapid, uniform heat-up of the bulk material.

The thermal gradient profile in a conventionally heated sample could be thought of as the reverse of that in microwave heating, in that the center could be slightly less hot than the outside because the thermal energy flows inward. In microwave heating, however, the center may be slightly hotter due to the internal energy conversion mechanisms, coupled with heat losses from the surfaces.

heat solution provider: microwave muffle furnace; microwave tube furnace; microwave lab furnace; microwave sintering furnace;microwave expansion furnace; microwave pyrolysis furnace;microwave pusher kiln; microwave rotary kiln;microwave high temperature melting furnace;microwave dental zirconia sintering furnace;


Advatages of sintering pure metal powders in Microwave furnace over conventional furnace

Posted on: 二月 27th, 2017 by langfeng No Comments

Application of microwaves for sintering of the pure metal powder in powder metallurgy process has been emerged as a potential process. The microwave sintering has significant advantages over conventional sintering because of different diffusion
mechanism involved in it. The following facts of microwave sintering can be summarized as:
1.The diffusion mechanisms in conventional and microwave sintering are quite different because of non thermal effects of microwave.
2.The smoother surface of powder compact is developed in short time by microwave sintering than conventional sintering.

3.The log (x/a) and log (t) have a linear relationship with a slope equals to 1/n where values of n different for conventional and microwave sintering which interprets existence of the different diffusion mechanisms.
4.The mechanical properties of microwave sintered compactedmetal power can be improved by pre working on metal powder as in the case of tungsten powder.  Langfeng high temperature microwave sintering furnace: LF-QS1512 1516

5.During microwave sintering, at lower temperatures surface diffusion and at higher temperatures volume diffusion are
dominant diffusion mechanisms as in the case of pure copper powder.

6.Thermal profile during microwave sintering in multimode microwave furnace depends upon particle size and porosity
present in compacted powder metal.  Langfeng high temperature microwave high vacuum sintering furnace: LF-ZK4516 ZK6016

7.The effect of oxidation on sintering of metal powder by microwave is less effective phenomenon in comparison to conventional sintering.

microwave muffle furnace; microwave tube furnace; microwave lab furnace; microwave sintering furnace;microwave expansion furnace; microwave pyrolysis furnace; microwave pusher kiln; microwave rotary kiln; microwave high temperature melting furnace; microwave dental zirconia sintering furnace;

Inhibition Mechanism of Carbide Grain Growth Inhibitor

Posted on: 二月 22nd, 2017 by langfeng No Comments

During the liquid-phase sintering, tungsten, carbon gradually dissolve in the liquid phase, at a certain temperature they can achieve homeostasis during dissolution-  precipitation .The solubility of tungsten carbide particles in the liquid phase is closely related to the particle size, the degree of surface energy and temperature. The greater size difference between the small particles and large particle, the greater difference between the saturated solubility in the liquid phase, so that the driving force of the tungsten carbide grains grows larger. With the refinement of the initial tungsten carbide, cobalt powder, especially for the tungsten carbide particle size less than 0.2 microns, tungsten carbide grains, during the sintering process, will grow rapidly to form coarse particles discontinuously, which significantly reduces the mechanical properties of carbide. Therefore, when the sintering of ultra-fine carbide, often we need to inhibit grain growth of tungsten carbide, to minimize and eliminate the non-continuous grain growth.

The mechanism of inhibitor: As inhibitors can fuse in the binder phase, whereby the liquid can be absorbed on the surface of tungsten carbide, hereby to diminish the area of contact with the liquid, and reduce the solid – liquid interfacial energy , so that the solubility of tungsten carbide particles mitigates, at the same time the differences of solubility among varying grains is reduced, the recrystallization grains of tungsten carbide is hindered. If under the sintering temperature of the WC-Co carbide, the solubility of tungsten carbide in a cobalt binder phase is 40%, while by the aid of inhibitor, the solubility of tungsten is reduced to 10%. The reduced solubility impact directly on the  dissolution and precipitation of tungsten carbide, at the same time, the inhibitors may be deposited on the tungsten-cobalt, tungsten carbide-tungsten carbide interface during precipitation, which further prevents the grain growth of tungsten carbide. Among the various grain growth inhibitors, the most effective inhibitors are vanadium carbide and chromium carbide,which can reduce the grain size of tungsten carbide to 0.15 microns.

Changsha Langfeng Metallic Material Co., Ltd. is one of very few leading manufacturer for metallic carbide powders:

carbide powder: Chromium Carbide Cr3C2 , Hafnium Carbide HfC, Molybdenum Carbide Mo2C, Niobium Carbide NbC, Tantalum Carbide Tac, Titanium Carbide TiC, Vanadium Carbide VC, Zirconium Carbide ZrC, Titanium Carbide Nitrides Ti (C,N); (Ta,Nb)C powder, (W,Ti)C powder, (W,Ta)C powder, (Ti,Ta)C powder,(W,Ti ,Ta)C powder, (W,Ti,Ta,Nb)C powder

Different types of grain inhibitors have different effects on the carbide performance, while adding more than one grain inhibitors is more favorable to enhance the overall performance of carbide. Adding vanadium carbide alone can significantly improve the hardness of the alloy, but will decline its strength, while adding chromium carbide alone can significantly improve the strength and corrosion resistance of ultra-fine cemented carbide and keep the hardness, therefore, vanadium carbide and chromium carbide are the most popular inhibitors to produce of ultra-fine carbide, and the combination of the two can play the best, generally the adding amount is of 1% or less.



Factors Affecting Sintering Quality of Powder Products

Posted on: 二月 16th, 2017 by langfeng No Comments

carbide powder sintering process

There are many factors that affect the performance of the sintered body, mainly the properties of the powder body, the forming conditions and the conditions of sintering. Sintering conditions include heating rate, sintering temperature and time, cooling rate, sintering atmosphere and sintering pressure conditions.
The sintering temperature and the length of the length of the sintered body of the porosity, density, strength and hardness. Sintering temperature is too high and too long, will reduce product performance, and even products over burned defects; sintering temperature is too low or too short, the product will be due to undercurrent caused by performance degradation.

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Composite carbide powders in cermets

Posted on: 二月 7th, 2017 by langfeng No Comments

(W,Ti,Ta,Nb)C powder

Cermets are composites produced by a combination of a ceramic and a metal. Cermets were the results of concerted efforts to develop an ideal material for high-temperature applications like jet engine turbine blades. These applications require a combination of high hardness, wear resistance and creep properties along with a significant improvement in toughness. Cermets bring together the useful characteristics of ceramics such as hardness, oxidation and heat resistance of carbides, nitrides and carbonitrides with binders, usually cobalt and nickel.

They can be represented by the general formula (Ti,Ta,Nb,W,Mo)(C,N)-(Co,Ni). The different elements form compounds like carbides, nitrides or carbonitrides and contribute to various properties. For example, Mo2C gives improved wettability of Ti(C,N) IN cermets, while TiC, Ti(C,N) give higher hardness than WC, lower thermal conductivity and lower solubility in ferrous alloys, a main component in cermets.

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Carbide cutting tool characteristics

Posted on: 一月 18th, 2017 by langfeng No Comments

tic application

Carbide cutting tool is mainly used for cutting steel, the cobalt content is usually 5% -10%, grain size range of 0.8-2μm. By adding 4% to 25% titanium carbide (TiC), the tendency of tungsten carbide (WC) to diffuse to the surface of the steel scrap can be reduced. By adding not more than 25% of tantalum carbide (TaC) and niobium carbide (NbC), the strength of the tool, the resistance to crescent crater wear and the thermal shock resistance can be improved. The addition of such cubic carbides also increases the red hardness of the tool and helps to avoid thermal deformation of the tool during heavy duty cutting or other processing where the cutting edge generates high temperatures. In addition, titanium carbide in the sintering process can provide nucleation sites, to improve the distribution of cubic carbides in the workpiece uniformity.

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Microwave drying technology

Posted on: 一月 11th, 2017 by langfeng No Comments

Microwave drying is different from the traditional drying method, the direction of heat transfer and water diffusion in the same direction. Compared with the traditional drying method, it has the advantages of large drying rate, energy saving, high production efficiency, uniform drying, clean production, easy realization of automatic control and improvement of product quality and so on, and thus more and more attention is paid to various fields of drying. As early as the 1960s abroad on the microwave drying technology on the application and theory of a large number of studies in recent decades has been further developed. China’s microwave drying technology research started late, compared with foreign countries have a certain gap, but also achieved good results, there are many research and application results. China’s microwave drying technology is now used in the food industry, chemical materials, pharmaceutical industry, mining industry, ceramics industry, laboratory analysis, wet natural rubber processing and so on.

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Scope of application of industrial microwave ovens

Posted on: 一月 5th, 2017 by langfeng No Comments


Industrial microwave equipment for the standard microwave experimental workstations, with heating speed, high efficiency, consistency of the processed material is good. For the sintering process to provide air, oxygen, nitrogen and reducing gases and other work environment. Can be used for magnetic materials, electronic ceramics, structural ceramics, metal compounds, nitrides and other materials sintering, synthesis purposes. In addition to the high temperature microwave oven and its sintering process technology unique “high, low, fast, provincial” advantages, but also has a wide range of uses, simple operation, process repeatability, stability, and significant advantages. Particularly suitable for the development of new materials, testing, and the use of small-scale production.
At present, Changsha Langfeng Metal Materials Co., Ltd. manufactures industrial microwave ovens for sale to domestic cities, and has been exported to more than 20 countries and regions such as Germany, Canada, the United States, Singapore, the Netherlands, South Africa, Australia, Turkey and Brazil.

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Niobium carbide powder

Posted on: 十二月 28th, 2016 by langfeng No Comments


Niobium carbide powder, Density:7.56g/cm3,melting point:3490°C. CAS No.: 12069-94-2, UN No.: 3178, chemical formula NbC, Niobium carbide powder is brown-gray metallic powder with purple lustre. The powder have the properties of high melting point,high hardness,high chemical stability,it is applied in the field of high temperature refractory material and cemented carbide products.

Choose High purity 99.99% Niobium oxide and High purity carbon black raw material, ensure the purity of Niobium carbide powder.

The special original additive application technology, ensure the powder grain densification, carbide sintered uniform, uniform particle size, Unique carbide sintering technology ensures low oxygen content, low free carbon, stable product quality.

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