Silicon Nitride Powder For Furnace Lining

 

We supply silicon nitride powder for furnace lining, refractory castables, bricks and other high-temperature refractory formulations.

Si3N4 combines low thermal expansion with high strength and thermal-shock resistance, which makes it useful when your refractory system needs better resistance to cracking, erosion and repeated heating and cooling.

Before you select a grade, we recommend checking more than Si3N4 purity alone. Particle size, oxygen content, the refractory formulation and your furnace operating conditions can all affect whether the powder is suitable for your process.

 

 

Parameter	Listed Specification
Product	Silicon Nitride Powder for Furnace Lining
Chemical Formula	Si3N4
Purity	95–99%
Particle Size Options	1–5 μm / 200–325 mesh
Oxygen Content	≤ 2%
Listed Thermal Stability	> 1400°C
Main Use	Furnace linings, refractories, metallurgy
Quality / Documentation	ISO 9001; SGS / COA according to confirmed order requirements

If your formulation requires a specific purity, oxygen limit or particle-size distribution, send us the required values before quotation. We can use your specification as the basis for confirmation instead of relying only on the general grade description.

 

Silicon Nitride Powder Factory Transportation

 

 

Furnace linings are repeatedly exposed to temperature change, mechanical load, slag or molten-metal contact and local erosion.

When Si3N4 is used in a suitable refractory formulation, its material properties can help the lining resist some of these service stresses.

The main reasons you may evaluate silicon nitride powder include:

• Thermal-shock resistance: useful where the lining experiences repeated heating and cooling.
• Low thermal expansion: helps reduce thermally induced dimensional change.
• Mechanical strength: relevant where the refractory system must maintain structural integrity at elevated temperature.
• Erosion and wear resistance: useful in refractory zones exposed to mechanical or material flow.
• Resistance to metal or slag interaction: relevant in formulations designed for metallurgical service.

The final performance still depends on the complete refractory composition, Si3N4 addition level, binder system, firing conditions and furnace environment. Silicon nitride powder should therefore be evaluated as one part of the formulation rather than as a stand-alone guarantee of lining life.

 

 

You can evaluate Si3N4 powder as an additive in refractory castables where thermal cycling, wear or molten-material exposure is an important design factor.

Before you add silicon nitride to a castable formulation, confirm:

• required Si3N4 purity;
• particle-size distribution;
• oxygen-content limit;
• addition ratio in the formulation;
• binder and aggregate system;
• service temperature and atmosphere.

If particle size affects mixing, packing density or dispersion in your castable, specify the required range directly in the RFQ.

 

 

Silicon nitride is also used in shaped refractory systems, including Si3N4-bonded SiC materials and other high-temperature components.

For these applications, the powder specification can influence the final ceramic or refractory microstructure. Purity, particle size and oxygen content should therefore be considered together with the manufacturing route.

If you are producing bricks or shaped components, send us the required powder chemistry and sizing.

 

 

Particle size is a separate specification from Si3N4 purity.

Fine powder may behave differently from a coarser powder during mixing, dispersion, compaction and bonding. The best size therefore depends on how you formulate and process the refractory material.

The current product information lists:

• 1–5 μm;
• 200–325 mesh.

These should be treated as listed particle-size options or specifications rather than assumed to be identical expressions of one size range.

If you have a defined D50, D90, sieve requirement or other particle-size acceptance method, include that measurement method in the purchase specification.

 

 

Oxygen content is one of the chemical parameters you may need to control when using silicon nitride powder in a refractory or ceramic formulation.

The listed product specification shows oxygen at ≤ 2%.

If your process requires a tighter limit, specify that maximum value directly. You should also confirm how oxygen is measured if it is an acceptance-critical parameter.

For batch approval, use the agreed specification and Batch COA rather than relying only on a general product-page value.

 

 

Our listed production process includes controlled nitridation, grinding, impurity control, homogenization and final packing.

The process steps include:

• controlled nitridation of silicon raw material;
• grinding to the required powder range;
• impurity control;
• homogenization for more consistent batch properties;
• final inspection and moisture-protected packing.

If you require a specific inspection item, test method or COA format, send it before production so we can confirm whether it can be included in the order specification.

 

 

We can prepare different packing formats according to your order volume and handling requirements.

Packing / Delivery Item	Available Information
Small Packing	1 kg / 5 kg / 25 kg sealed bags
Bulk Packing	500 kg / 1-ton jumbo bags
Protection	Moisture-protected and contamination-controlled packing
Transport	Air, sea or land freight according to order requirements
Listed Lead Time	7–12 business days

Final packing and lead time should be confirmed with the actual quantity, specification and destination before order approval.

 

Customer Visit for Silicon Nitride Powder and Refractory Material Cooperation

 

 

To receive a quotation that matches your furnace-lining formulation, send us the technical requirement together with the commercial information.

RFQ Item	What You Should Provide
Si3N4 Purity	Required minimum purity
Particle Size	Micron range, mesh or other defined distribution requirement
Oxygen Content	Maximum acceptable oxygen level, if controlled
Application	Castable, brick, coating or other refractory formulation
Quantity	Trial quantity or production-volume requirement
Packing	Small bags or bulk jumbo bags
Documents	COA, SGS or other required quality / export documents
Destination	Delivery location or destination port

If your specification differs from the listed 95–99% purity, ≤2% oxygen or current particle-size options, send the required limits first so we can confirm the available grade before quotation.

 

 

Q1: Why is silicon nitride powder used in furnace linings?
You can use Si3N4 in refractory formulations where thermal-shock resistance, low thermal expansion, strength and resistance to severe service conditions are important.

Q2: What purity of silicon nitride powder is available?
The current listed purity range is 95–99%. Send us your required minimum purity so we can confirm the available specification.

Q3: What particle sizes are listed?
The current product information lists 1–5 μm and 200–325 mesh. If particle size is critical, specify the required measurement method and acceptance range.

Q4: Can I use Si3N4 powder in refractory castables?
Yes, you can evaluate it for refractory castables. The final suitability depends on your complete formulation, particle-size requirement, addition ratio and furnace conditions.

Q5: Can I use silicon nitride powder for refractory bricks?
Yes. Si3N4 is used in shaped refractory systems including Si3N4-bonded materials. Send us the required purity and particle-size specification before ordering.

Q6: What is the listed oxygen content?
The current listed oxygen-content limit is ≤2%. If you require a lower value, include it in your RFQ.

Q7: What packing options can you provide?
The listed options include 1 kg, 5 kg and 25 kg sealed bags, as well as 500 kg and 1-ton jumbo bags.

Q8: Can you provide a COA?
Yes. Tell us which chemistry, particle-size or other batch values you need confirmed so we can align the document requirement with the order.

We supply silicon nitride powder for refractory and metallurgical requirements and can confirm purity, particle size, oxygen content, packing and batch documentation according to your agreed specification.

 

 

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