Graphite Sintering Tray for Ferrite Ceramic Components
Product Overview
Our graphite sintering trays are purpose-built fixtures for the high-temperature sintering of ferrite ceramic components, including MnZn and NiZn soft ferrites used in inductors, transformers, and electromagnetic interference (EMI) filters. These trays are manufactured from high-density, high-strength isostatic graphite that maintains mechanical stability at sintering temperatures up to 1400°C in vacuum or controlled-atmosphere kilns. The trays support stacked ferrite parts through multi-day sintering cycles while resisting thermal warpage and chemical reaction with ceramic powders.
Ferrite sintering demands fixtures that are dimensionally stable, non-reactive, and resistant to the reducing or oxidizing atmospheres used during debinding and sintering. Graphite is the ideal tray material because it does not contaminate ferrite compositions, offers excellent thermal shock resistance, and can be precision-machined into nest geometries that locate fragile green parts. At Jincheng Graphite, we supply sintering trays, setters, and saggars tailored to your kiln dimensions and ferrite part geometry, with options for multiple layers and stackable configurations.
Key Features
- High mechanical strength at temperature - maintains flatness and load-bearing capacity up to 1400°C
- Non-reactive with ferrite compositions - no iron or oxide contamination of MnZn/NiZn ceramics
- Excellent thermal shock resistance - withstands rapid kiln heating and cooling cycles
- Precision nest machining - custom pockets that locate fragile green ferrite parts without chipping
- High density for reduced porosity - minimizes ceramic powder adhesion and eases tray cleaning
- Stackable and multi-layer designs - maximize kiln loading density and throughput
- Long service life - resists sagging and warping over hundreds of sintering cycles
- Custom sizes available - machined to fit any pusher kiln, bell furnace, or batch kiln
Technical Specifications
| Parameter | Value |
|---|---|
| Material | Isostatic molded graphite |
| Bulk Density | 1.75 - 1.85 g/cm³ |
| Shore Hardness | 60 - 70 HS |
| Flexural Strength | 45 - 60 MPa |
| Compressive Strength | 80 - 100 MPa |
| Max Service Temperature | 1400°C (controlled atmosphere) |
| Thermal Conductivity | 90 - 120 W/(m·K) |
| Coefficient of Thermal Expansion | 2.5 - 3.5 × 10-6/K |
| Flatness | < 0.1 mm per 300 mm |
| Dimensional Tolerance | ±0.1 mm |
| Available Sizes | Up to 600 × 600 mm (larger sizes on request) |
| Surface Finish | machined, Ra 3.2 µm |
Applications
- MnZn ferrite cores - E-cores, toroids, and RM cores for power transformers
- NiZn ferrite components - chip inductors and EMI filter beads
- Ferrite magnets - barium and strontium ferrite magnet sintering
- PZT piezoelectric ceramics - lead zirconate titanate part sintering fixtures
- Alumina and zirconia ceramics - technical ceramic sintering setters and saggars
- Powder metallurgy pressing - graphite dies and trays for refractory metal compaction
Why Choose Jincheng Graphite?
- Specialized in ceramic sintering fixtures - years of experience serving ferrite and ceramic manufacturers
- Material selection guidance - we recommend the optimal graphite grade for your specific sintering atmosphere
- Nest pocket design - we machine custom locating pockets based on your part drawings
- Durable and dimensionally stable - trays designed to minimize sagging over hundreds of cycles
- Competitive pricing - direct factory pricing with no intermediary markup
- Fast lead times - standard trays ship within 10-15 business days
- Global shipping - export to ceramic and ferrite producers worldwide
- Custom thickness and configuration - single-use setters or heavy-duty reusable trays
FAQ
Q: How many sintering cycles does a graphite tray last?
A: Under typical ferrite sintering conditions (1200-1400°C in controlled atmosphere), a well-maintained graphite tray typically lasts 200-500 cycles before surface wear or warpage requires replacement. Tray life depends heavily on atmosphere control, loading weight, and thermal ramp rates.
Q: Can you machine custom pockets for our specific ferrite part?
A: Yes. Send us your green part drawing or a physical sample, and we will CNC-machine precision locating pockets that cradle the part without contact pressure during sintering.
Q: Should we use coated or uncoated graphite trays?
A: Most ferrite sintering applications use uncoated high-density graphite, which is cost-effective and non-reactive. If your process requires zero carbon pickup or extremely clean atmospheres, we can offer CVD SiC-coated trays as a premium option.
Q: What is your minimum order quantity?
A: We accept both small trial orders and bulk production orders. Standard tray designs can be ordered from a single piece; custom pocket designs require a drawing review and typically have a minimum order of 5-10 pieces.
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