Crystal growth components

Selection considerations

Parts that go inside a crystal puller

Crystal growth components are the chambers, seals and insulation that sit inside or on a furnace used to pull silicon ingots at the start of wafer processing. The complete machines belong to crystal growth furnaces, for example NAURA's Czochralski silicon growth furnace from NAURA. Parts in this class are bought to fit such a furnace, as spares or as subassemblies for a furnace builder. Neighbouring consumables include the quartz crucible from process quartz parts, its coating under crucible coating materials, and graphite hot-zone parts under process graphite parts. The pulled ingot then moves on to silicon ingot grinding.

Three different purchases in one class

The listed items cover three quite different buys:

• The furnace main chamber from Haoxiang is a structural vessel built to drawing. Heating, pumping and growth performance come from the furnace design around it, so the order is about fit, material and leak tightness.
• The ferrofluid vacuum sealing transmission devices from Hangzhou Hongsheng carry rotation into the vacuum chamber, for example for crystal or crucible rotation. You pick a configuration by matching shaft, flange and duty to a Hongsheng drawing.
• The PAN sandwich rigid felt from Huaxin is carbon-fibre insulation board for the thermal field. Grade, size and thermal values are agreed per order.

Specifying each one

For a chamber, send the approved assembly drawing with every mating connection and ask Haoxiang to state material, tolerances and leak limit in writing. For a rotary seal, describe the real pressure range, speed and running hours, and, when replacing an existing unit, ask Hongsheng to mark which dimensions match your current assembly. For felt, name the furnace position, the PAN sandwich grade and the finished surface, then ask Huaxin to report measured properties for each lot. The guide on material qualification and lot certificates is written for module materials, but its approach to lot records and change notice works for hot-zone consumables too.

Graphite and felt parts often need high purity in the hot zone; if you treat them in-house, see graphite purification equipment. Keep a part list per furnace so spares stay matched to the right drawing revision.

Plan the equipment scope

For crystal growth components, begin your enquiry with chamber dimensions, mating flanges and the furnace drawing. Request a configuration-specific quotation and agree on material grade, weld inspection and the agreed leak-test method. Each listing shows the published values and the questions to confirm.

Read equipment buying guides or prepare a sourcing brief.