High-Purity Molybdenum Disilicide Powder

Product Specifications

Technical details and manufacturing context for High-Purity Molybdenum Disilicide Powder

Definition

High-purity molybdenum disilicide (MoSi2) powder is a specialized refractory material produced through advanced metallurgical processes. This semi-finished industrial substance serves as a critical raw material for manufacturing heating elements, high-temperature structural components, and oxidation-resistant coatings. In B2B supply chains, it's essential for aerospace, semiconductor processing, and industrial furnace applications where extreme thermal stability above 1600°C is required. The powder form enables precise formulation control for composite materials and advanced ceramics production.

Typical specifications include a median particle size (D50) of 1–5 μm, chemical purity of at least 99.9% MoSi2 by weight (per GB/T 5314), bulk density of 0.8–1.2 g/cm³, oxygen content ≤0.1 ppm, specific surface area of 2–6 m²/g, melting point of 2030°C, tetragonal crystal structure, apparent density of 1.2–1.8 g/cm³, flow rate of 30–50 s/50g, maximum operating temperature of 1700°C in oxidizing atmospheres (higher in inert gas), thermal conductivity of 25–45 W/(m·K), electrical resistivity of 0.2–0.4 Ω·cm, particle size distribution (D10: 0.5–1.5 μm, D90: 5–10 μm), and moisture content ≤0.05%. These values are reference ranges and must be verified for the specific product batch.

As a neutral directory, CNFX does not manufacture or sell this material. Buyers should confirm model-specific values and applicable standards with the legal manufacturer or supplier before procurement.

Working Principle

Molybdenum disilicide operates by forming a protective silica (SiO2) layer on its surface when exposed to high temperatures in oxidizing atmospheres. This self-healing glassy layer acts as a diffusion barrier, preventing further oxidation of the underlying material. The silica layer remains stable and adherent through repeated thermal cycling, allowing the material to maintain its structural integrity even at temperatures up to 1700°C. In inert or reducing atmospheres, the protective layer does not form, but the material can withstand even higher temperatures. This oxidation resistance is critical for applications such as heating elements and high-temperature structural components, where the material must endure extreme conditions without degradation.

Common Materials

Molybdenum, Silicon

Technical Parameters

Parameter	Typical range	Notes & selection driver
Particle Size D50Required	1–5 μm	Median particle diameter in distribution
Chemical PurityRequired	≥99.9 %	Minimum MoSi2 content by weightGB/T 5314
Bulk DensityRequired	0.8–1.2 g/cm³	Loose powder packing densityGB/T 1479
Oxygen ContentRequired	≤0.1 ppm	Maximum oxygen impurity levelGB/T 5314
Specific Surface Area	2–6 m²/g	BET surface area measurementGB/T 19587
Melting Point	2030 °C	Material melting temperature
Crystal Structure	Tetragonal	Stable phase for high-temperature service
Apparent Density	1.2–1.8 g/cm³	Important for powder flow and packingGB/T 5162
Flow Rate	30–50 s/50g	Ensures consistent feeding in automated processesGB/T 1482
Maximum Operating Temperature	1700 °C	In oxidizing atmosphere; higher in inert gas
Thermal Conductivity	25–45 W/(m·K)	Affects thermal shock resistance
Electrical Resistivity	0.2–0.4 Ω·cm	Relevant for heating element applications
Particle Size Distribution	D10: 0.5–1.5, D90: 5–10 μm	Narrow distribution improves sintering uniformityGB/T 19077
Moisture Content	≤0.05 %	Prevents agglomeration during storageGB/T 6283

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Molybdenum Element Part
Provides high-temperature strength and thermal conductivity

Material: Refractory metal
Silicon Element Part
Forms protective silica layer during oxidation

Material: Metalloid
Process Additives Optional Part
Controls particle morphology during production

Material: Various chemical agents

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for High-Purity Molybdenum Disilicide Powder.

Manufacturers of High-Purity Molybdenum Disilicide Powder

Manufacturer profiles associated with High-Purity Molybdenum Disilicide Powder.

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Frequently Asked Questions

What is the typical particle size of this MoSi2 powder?

The median particle size (D50) is typically 1–5 μm, with a distribution of D10: 0.5–1.5 μm and D90: 5–10 μm. These values are reference ranges and should be confirmed with the supplier for the specific batch.

What purity level is available?

The chemical purity is at least 99.9% MoSi2 by weight, as referenced in GB/T 5314. Oxygen content is limited to ≤0.1 ppm. Always verify the actual certificate of analysis with the manufacturer.

What is the maximum operating temperature?

In an oxidizing atmosphere, the maximum operating temperature is 1700°C. In inert gas, it can be higher. The melting point is 2030°C. These values are indicative and should be validated for your specific application.

How should I verify the quality of this powder?

Request a certificate of analysis from the supplier, including particle size distribution, purity, oxygen content, and other parameters. Ensure that the testing methods align with the standards listed, such as GB/T 5314 for purity and GB/T 19587 for surface area.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 10 MPa (100 bar) in processing equipment
other spec:	Particle size: 0.5-10 μm typical, purity: >99.5%, slurry concentration: 20-60 wt% in aqueous/organic media
temperature:	Up to 1700°C in oxidizing atmospheres, 1900°C in inert/reducing atmospheres