Barium carbonate as a key raw material in the field of electronic ceramics

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Barium carbonate, as a key raw material in the field of electronic ceramics, has the following application values:

1. Preparation of high dielectric performance ceramics

Barium carbonate is the core raw material for producing barium titanate (BaTiO3), which is one of the most important ferroelectric materials in electronic ceramics. Its dielectric constant can reach 1200-1400 at room temperature, and it has a significant Curie temperature (about 120 ℃). Doping modification can meet the dielectric stability requirements at different temperatures. For example, in multilayer ceramic capacitors (MLCC), the dielectric properties of barium titanate based ceramics directly affect the capacitance and frequency response of the capacitor, and the purity (usually required to be ≥ 99.5%) and particle size distribution (D50 ≤ 2 μ m) of barium carbonate are key factors in ensuring the performance of barium titanate.

2. Core material of PTC thermistor

After doping (such as donor doping), barium titanate based ceramics can form thermistors with positive temperature coefficient (PTC) characteristics. When the temperature exceeds the Curie point, the resistivity of this type of material will sharply increase, and it is widely used in scenarios such as motor starting and overheating protection. For example, in air conditioning compressors, PTC thermistors can prevent motor damage due to overheating, and their stability is closely related to the purity and crystallinity of barium carbonate.

3. Optimization of Microwave Dielectric Ceramics

In the fields of 5G communication and satellite navigation, microwave dielectric ceramics need to balance high dielectric constant (ε r) and low dielectric loss (tan δ). Barium carbonate, as a basic raw material, can be compounded with other oxides such as zirconia and magnesia to prepare ceramic materials suitable for high-frequency circuits. For example, in millimeter wave radar, the dielectric properties of such ceramics directly affect signal transmission efficiency, and the calcination process of barium carbonate (such as high-temperature solid-phase method) is crucial for controlling the microstructure of the material.

4. Auxiliary materials for ferrite cores

Barium carbonate is used as a flux in the preparation of ferrite cores, which can reduce sintering temperature and improve magnetic properties. For example, in Mn Zn ferrite, the amount of barium carbonate added is usually 0.5% -2%. By adjusting the grain boundary phase composition, the initial magnetic permeability and electrical resistivity of the material can be improved. This type of magnetic core is widely used in high-frequency electronic devices such as switching power supplies and transformers.

5. Doping modification of piezoelectric ceramics

In piezoelectric ceramics such as lead zirconate titanate PZT, barium carbonate can be used as a dopant to improve the piezoelectric coefficient and mechanical quality factor (Qm) of the material by replacing some lead ions. For example, in ultrasonic transducers, the electromechanical coupling coefficient (k ₚ) of such ceramics directly affects the energy conversion efficiency, while the doping process of barium carbonate requires precise control to avoid lattice distortion.

6. Balance between environmental protection and safety features

The toxicity of barium carbonate (LD ₅₀: 500mg/kg) requires strict control in the production process of electronic ceramics. For example, in the wet synthesis of barium titanate, the byproduct of the reaction between barium carbonate and sulfuric acid, barium sulfate, needs to be separated by precipitation and treated with wastewater to ensure that the heavy metal ion content meets environmental standards. Meanwhile, the recovery and utilization of CO ₂ in the calcination process can reduce carbon emissions, which is in line with the trend of green manufacturing.

7. Cost and supply chain optimization

The production cost of barium carbonate is greatly affected by fluctuations in the prices of raw materials (barite, coal). For example, in the preparation of barium titanate, barium carbonate accounts for about 40% -50% of the raw material cost. By optimizing the calcination process (such as reducing the calcination temperature to 900-1000 ℃), energy consumption can be reduced. In addition, the global supply chain of barium carbonate is concentrated in China (accounting for over 80% of global production capacity), and its price fluctuations directly affect the production costs of electronic ceramic enterprises.

8. Expansion of Emerging Application Fields

With the development of 5G communication and the Internet of Things, the demand for the application of barium carbonate in microwave dielectric ceramics and LTCC (Low Temperature Co fired Ceramics) continues to grow. For example, the performance improvement of high dielectric constant ceramics used in 5G base station filters depends on the optimization of barium carbonate based materials. Meanwhile, in the field of new energy, the research on the electrolyte separator of barium carbonate based ceramics in solid-state batteries is also in the exploratory stage.

The application of barium carbonate in electronic ceramics is not limited to traditional fields. Through doping, composite and other modification technologies, it is gradually expanding to emerging fields such as high-frequency communication and new energy, becoming a key material supporting the development of modern electronics industry.