Graphite Tray And Boat For Nitrogen Atmosphere Sintering Furnace

Graphite Tray and Boat for Nitrogen Atmosphere Sintering Furnace

Product Overview

Our graphite trays and boats for nitrogen atmosphere sintering are precision-machined support vessels used to hold parts during sintering in controlled nitrogen or nitrogen-hydrogen atmospheres. These trays are essential in powder metallurgy, hard metal, and electronic component manufacturing where parts must be sintered under protective atmosphere to prevent oxidation. Made from high-density isostatic graphite, our trays withstand repeated heating to 1400-1800°C under flowing nitrogen without warping, outgassing, or reacting with the load. We manufacture flat trays, box-type boats, and custom pocketed trays for specific part geometries.

Nitrogen atmosphere sintering is widely used for stainless steel powder metallurgy parts, cemented carbide, magnetic materials, and ceramic components. The sintering tray must remain flat, resist nitrogen and hydrogen attack, and provide clean, consistent support across hundreds of furnace cycles. At Jincheng Graphite, we design and machine graphite sintering trays matched to your furnace dimensions, part geometry, and load requirements. Each tray is precision-planed and can be equipped with stacking rails, registration features, or part-specific pockets as required.

Key Features

• Nitrogen atmosphere stable - no reaction or degradation under flowing N2 and N2/H2
• Flat and dimensionally stable - maintains flatness through hundreds of sintering cycles
• High density - resists infiltration and erosion from molten phases during sintering
• Custom tray geometry - flat trays, box boats, or pocketed supports for specific parts
• Stackable design - stacking rails for multi-level batch loading
• Low outgassing - clean performance that does not disturb atmosphere purity
• Thermal shock resistant - withstands rapid heating and cooling in production furnaces
• Refurbishable - worn surfaces can be re-planed to extend tray service life

Technical Specifications

Applications

• Stainless steel PM parts - trays for powder metallurgy stainless steel sintering
• Cemented carbide inserts - boats for tungsten carbide sintering under nitrogen
• Magnetic materials - trays for NdFeB and SmCo magnet sintering
• Electronic ceramics - setters for ferrite and piezoelectric component sintering
• Metal injection molding (MIM) - trays for MIM part debinding and sintering
• Cemented carbide cutting tools - boats for indexable insert production

Why Choose Jincheng Graphite?

• Atmosphere sintering expertise - deep understanding of N2 and N2/H2 furnace requirements
• Precision planing - both faces machined for flat, parallel support
• Custom tray design - pockets, rails, and covers matched to your parts
• Material selection - recommend density based on sintering temperature and load
• Volume supply - reliable monthly tray supply for production lines
• Refurbishment service - re-plane worn trays to extend service life
• Competitive pricing - factory-direct sintering tray manufacturing
• Global delivery - PM and carbide manufacturers in 30+ countries

FAQ

Q: How do I prevent parts from sticking to the graphite tray?
A: Most parts sinter cleanly on uncoated graphite. If your parts contain reactive oxides or have a surface that tends to stick, we recommend a light boron nitride (BN) spray or a thin alumina wash between the part and tray. We can also supply trays pre-coated with BN for critical applications.

Q: How often should trays be replaced?
A: Under typical nitrogen sintering at 1400-1600°C, graphite trays last 200-500 cycles. Replace trays when the surface becomes uneven, develops cracks, or begins to affect part flatness. Re-planing the top surface typically restores the tray and extends life by another 100-200 cycles.

Q: Can you supply trays that stack on top of each other?
A: Yes. We machine stacking rails or locating features into tray corners so that trays stack securely in the furnace without shifting. Stackable tray configurations significantly increase batch loading density and improve furnace utilization.

Q: What information do you need to quote a custom tray?
A: Please provide your furnace inner dimensions, the part geometry and weight per tray, the sintering temperature and atmosphere, and how many trays you load per batch. Our engineering team will design a tray that maximizes loading while maintaining flatness and clearance.