From crucible holders to insulation felt, every part of Dehong's photovoltaic thermal field range is built for the two processes that define solar silicon manufacturing: Czochralski monocrystalline pulling and directional solidification of multicrystalline ingots. Browse the matching furnace pages for single-crystal furnaces and multi-crystalline furnaces.
CZ pulling: a rotating crucible holder and main heater hold a stable melt above 1500°C.
DSS casting: plates and a bottom heater shape the downward solidification front.
Crucible holders, support rods, main heaters, and support rings keep the rotating pulling process stable above 1500°C.
Cover plates, top plates, protection plates, and bottom heaters shape the downward solidification front over 50–70 hour batch cycles.
Furnace bases, C/C fasteners, and integral hard felt anchor and insulate the complete hot-zone stack.
OEM furnace manufacturers and integrated cell and module makers source qualified thermal field components at scale.
Stable service up to 3000°C with near-zero thermal expansion keeps hot-zone geometry fixed across thousands of cycles.
Low ash content protects the silicon melt from the metallic contamination that graphite and refractory metals are more prone to introduce.
Lower density than graphite reduces rotational inertia and thermal mass, which improves crystal rotation and heat-up control.
Mechanical integrity holds up over far more thermal cycles than graphite, which cuts component changeovers and furnace downtime.
Each component in the photovoltaic line starts from one question: what load, temperature, and purity condition does this position inside the furnace actually face? A decade of C/C process experience, built by our engineering team, turns that question into a fiber layout and a densification schedule.
We select 2D, 2.5D, or 3D fiber layouts by loading mode: longitudinal reinforcement for support rods under tension, radial reinforcement for crucible holders under compression, and balanced layups for heaters under bending.
Heater geometry, support ring dimensions, and felt placement are tuned to control the V/G ratio in CZ growth and the solidification-front shape in DSS ingots, which directly affects crystal defect density. Our insulation hard felt is designed as part of the same thermal model.
New furnace designs and OEM drawings go through prototype runs and dimensional verification before a component is qualified for full production, so the first production batch matches the spec. Send your drawings through our contact page to start.
Every category on this page, from crucible holders to insulation felt, is produced end to end in-house: fiber preform, densification, graphitization, precision machining, and final inspection. You can read more about our preform capability on its own page.
CVI densification for structural, load-bearing components that require the lowest porosity.
Graphitization heat treatment to stabilize thermal conductivity and relieve residual stress.
Diamond tooling for threads, bores, and slots without delamination at fiber boundaries.
Dimensional tolerances down to ±0.05–0.1 mm on critical mating surfaces.
Bulk density and open porosity testing on every production batch.
Flexural and compressive strength verification against the component specification.
Ash-content analysis to confirm metallic impurity limits for silicon purity.
CMM dimensional inspection before shipment, with certificates available on request. See our quality inspection overview.
These are the questions solar wafer producers and furnace builders ask most often when evaluating carbon-carbon thermal field parts.
Graphite is isotropic and relatively brittle, so it erodes and cracks faster under repeated thermal cycling. C/C composite is reinforced with carbon fiber, so its fiber orientation can be engineered for each component. That gives it better thermal shock resistance, lower density, and a longer service life at the same operating temperature.
Service life depends on furnace cycle time, temperature profile, and load. In general, C/C components keep their mechanical integrity over a substantially higher number of thermal cycles than equivalent graphite parts, so hot-zone components need replacing less often. See our crucible holder and main heater pages for details.
Yes. Send furnace drawings, OEM part numbers, or performance targets such as temperature, load, and atmosphere. We return a matched fiber architecture, density grade, and dimensional spec before production tooling begins.
We control ash content and metallic impurity levels through raw fiber selection, densification process control, and ICP-MS ash-content analysis on finished parts. This keeps the contamination risk to the melt low.
Lead time varies with component complexity and order volume. Standard catalog dimensions ship faster, while fully custom geometries need prototype validation first. We confirm specific lead times once we have reviewed your drawings or specifications.
Yes. Material certificates, dimensional inspection reports, and chemical analysis results can be provided as a documentation package on request. Contact our team to ask for yours.
