Aluminum nitride (AlN) is a high-performance material with high thermal conductivity (320 W·m⁻¹·K⁻¹), excellent electrical insulation (>10¹⁴ Ω·cm), and strong mechanical properties. Its low dielectric constant (8.0 at 1 MHz) and minimal dielectric loss (tanδ = 10⁻⁴) make it ideal for electronics.

Key applications include:

Power device packaging

High thermal conductivity AlN ceramic substrates

Electrostatic chucks' material for semiconductor processing

Excellent insulation ceramic components ( ceramic heaters,ceramic nozzles)

AlN combines thermal management, electrical resistance, and durability for advanced industrial use.

AlN ceramics are sintered from AlN powder, and high-quality AlN powder is a prerequisite for achieving high-performance AlN ceramics. The preparation of AlN powder significantly impacts the sintering, forming, and thermal conductivity of the final product. Industrially, there are three main methods for producing AlN powder: direct nitridation, self-propagating high-temperature synthesis (SHS), and carbothermal reduction.

1. Principle of the Carbothermal Reduction Method

The carbothermal reduction method typically uses aluminum compounds (such as alumina or aluminum hydroxide) and excess elemental carbon or organic carbon as raw materials. These are reacted in a nitrogen (N₂) or ammonia (NH₃) atmosphere at high temperatures. The product is then decarburized in an oxidizing atmosphere at 500–700°C to obtain AlN powder. This method yields powder with low oxygen content, high purity, narrow particle size distribution, and regular particle morphology.

The reaction mechanism can be summarized as follows:

①Reduction of alumina: Carbon reduces alumina to form intermediate products such as Al(g) and Al₂O(g).

②Nitridation: Aluminum reacts with nitrogen to form AlN.

The reaction mechanism of carbothermal reduction can be categorized into gas-solid and solid-solid reactions. Experimental observations of aluminum vapor emission peaks support the formation of gaseous aluminum intermediates under specific conditions. The gas-solid reaction explains mass loss during the process and the mass transfer involved in whisker growth. Meanwhile, the solid-solid reaction mechanism accounts for the morphological continuity between the product and precursor, as well as the formation of intermediate compounds such as Al-O-C and Al-C-N during the conversion of Al₂O₃. This mechanism is more widely accepted.

The AlN powder manufacturing process mainly includes ball milling and mixing, nitridation synthesis, low-temperature decarburization, and AlN crushing/recovery.

2. Process Characteristics of Carbothermal Reduction

The carbothermal reduction method offers advantages such as abundant raw materials, simple processing, and suitability for large-scale production. The synthesized powder exhibits high sphericity, purity, fine particle size, narrow size distribution, and good dispersibility, making it the primary industrial method for AlN powder production. Compared to direct nitridation and SHS, carbothermal reduction yields better sphericity and higher purity AlN powder .

About Xiamen Juci Technology Co., Ltd.

Xiamen Juci Technology Co., Ltd. is a high-tech enterprise specializing in the research, development, production, and sales of high-performance ceramic materials. The company is committed to providing high-quality aluminum nitride series products and solutions for industries such as electronics, semiconductors, and aerospace, earning widespread trust from customers with its exceptional quality and service.

Media Contact:
Xiamen Juci Technology Co., Ltd.

Phone: +86 592 7080230
Email: miki_huang@chinajuci.com
Website: www.jucialnglobal.com

Purpose of a IMTP Metal Saddle Ring

IMTP Metal Saddle Rings are primarily used in packed towers for the following purposes:

1. Gas Absorption

   • Removing specific components from gas streams (e.g., CO₂, H₂S, SO₂ removal in flue gas desulfurization).

2. Distillation

   • Separating liquid mixtures based on their boiling points (e.g., in the petrochemical industry).

3. Stripping

   • Removing volatile components from liquids (e.g., stripping ammonia from wastewater).

4. Heat Transfer

   • Enhancing heat exchange efficiency in cooling towers or heat exchangers.

5. Chemical Reactions

   • Improving contact between reactants in catalytic or reactive distillation processes.

6. Wastewater Treatment

   • Removing pollutants such as VOCs (volatile organic compounds) or ammonia from water.
   • 

Industrial ceramic production process mainly includes the following steps ‌ :

‌1. Powder preparation ‌ : The production of industrial ceramics first requires the preparation of high quality ceramic powder. The quality of the powder directly affects the quality of the final product, which usually requires high purity, good dispersion and uniform particle size distribution. For example, microcrystalline zirconium materials are often used as ceramic powder raw materials for 3C product shells because of their advantages of phase transition toughening ‌.

‌2. Molding ‌ : Molding is the key step in the production of ceramic parts, the commonly used molding methods include injection molding, dry press molding and casting molding.

‌(1) injection molding ‌ : similar to plastic injection molding, suitable for the production of small complex shapes of precision ceramic parts. The process involves mixing the organic carrier with ceramic powder, drying, granulating and injecting it into a mold to form a blank in the desired shape ‌.

‌(2) dry pressing ‌ : the powder after granulation is loaded into the mold, and the billet of a certain shape is made by applying pressure to the press. This method is suitable for the production of flat shaped products, high efficiency but may not be uniform density ‌.

‌(3) casting molding ‌ : suitable for the production of thin ceramic material, the casting machine will flow the slurry to the base band to form a smooth upper surface of the blank film, after drying, cutting, stamping or drilling, and finally firing into the finished product ‌.

‌3. Sintering ‌ : The forming body needs to go through the sintering process to achieve the required physical and chemical properties. Parameters such as temperature, time and atmosphere need to be controlled in the sintering process to ensure the density and strength of the product ‌.

4.‌ subsequent processing ‌ : The sintered ceramic parts may need to be grinding, polishing and other subsequent processing to improve the surface quality and accuracy. Commonly used processing technologies include grinding, ultrasonic machining, electric discharge machining, laser machining and CNC milling ‌.

1. High hardness and wear resistance

Wear resistance: High hardness of industrial ceramics, suitable for high wear environment, such as mines, cement factories.

Long life: Long service life in harsh conditions, reduce the frequency of replacement.

2. High temperature resistance

High temperature stability: can maintain performance at high temperatures, suitable for aerospace, metallurgy and other industries.

Thermal shock resistance: can withstand rapid temperature changes, not easy to crack.

3. Corrosion resistance

Chemical inertness: Strong resistance to acid, alkali, salt and other corrosive substances, suitable for chemical and pharmaceutical industries.

Oxidation resistance: Stable performance in high temperature oxidation environment.

4. Electrical insulation

Insulation performance: Good electrical insulation, suitable for electronics and power industry.

High frequency applications: Maintains insulation properties at high frequencies and high temperatures.

5. Low density

Lightweight materials: Low density, suitable for aerospace and automotive industries that need to reduce weight.

High specific strength: high strength and light weight.

6. Biocompatibility

Medical applications: Non-toxic and compatible with human tissue, suitable for medical implants and devices.

7. Optical performance

Transparent ceramics: Some ceramics have excellent optical properties, suitable for laser technology, optical devices.

8. Environmental protection

Renewable materials: Some ceramics can be recycled to reduce environmental pollution.

Low energy production: The production process uses low energy and reduces the carbon footprint.

9. Versatility

Diverse applications: By adjusting the composition and process to meet different needs, such as sensors, catalyst carriers.

10. Economic benefits

Low long-term costs: While initial costs are high, long life and low maintenance requirements reduce overall costs.

Improve efficiency: Superior performance improves equipment efficiency and reduces downtime.

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