CN202808987U - Large-sized single crystal seed - Google Patents

Abstract

The utility model discloses a large-sized single crystal seed, which is characterized in that the length is between 700 and 1200mm, the thickness is between 5 and 30mm, and the width is between 50 and 400mm. A production process of the large-sized single crystal seed comprises the following steps of (1) cutting head and tail of a large-diameter single crystal silicon rod to preset length; (2) longitudinally cutting the single crystal silicon rod without head or tail into a slice with a preset thickness; and (3) trimming the cut slice to obtain a final finished product. The large-sized single crystal seed has a large size and small number of splicing, and is more advantages to ingot casting of single crystals. The process of the large-sized mono-like seed can be used for producing more seed products in single crystal silicon rods with the same length and diameter, so that the round area of the whole single crystal silicon rod is used in the largest range, the utilization rate is greatly improved, and the production cost can be reduced.

Description

A kind of large size class single crystal seed

Technical field

The utility model relates to a kind of large size class single crystal seed.

Background technology

The restriction that present traditional class single crystal seed is subject to cutting technique is the made 156*156 of being of a size of square in the market, and as shown in Figure 1, its main drawback is very few for the silicon single crystal rod usable floor area in the cutting production process, causes high expensive.Its limitation of size is mainly and limited by production unit line excavation machine, can only cut out the seed crystal of this maximum 156*156 size.

The little seed crystal of present 156*156 such as the seed crystal that need are spliced into final finished 780*780, need 25 of splicings, since when splicing splicing is improper gap excessive, polycrystal raw material is liquid after melting in class monocrystalline ingot casting process simultaneously, liquid will flow into by the seed crystal slit, and the buoyancy effect that is subject to more easily liquid owing to the monolithic seed crystal is floating, affects final class monocrystalline Cheng Jing, because large size seed crystal monolithic is times over the weight of 156*156, buoyancy almost can be ignored on its impact.Large size seed crystal combination only needs the several areas that can reach 780*780 in addition, than small size seed crystal combination slit lacked near half, the potential impact that is subject to buoyancy greatly reduces.

The utility model content

The utility model purpose is to provide a kind of silicon single crystal rod utilization ratio high for the defective of prior art, large large size class single crystal seed and the production technique thereof of cutting seed size.

The utility model adopts following technical scheme for achieving the above object:

A kind of large size class single crystal seed is characterized in that: its length is 700-1200mm, and thickness is 5-30mm, and width is 50-400mm.

A kind of production technique of large size class single crystal seed comprises the steps:

(1) the major diameter single crystal silicon rod is decaptitated tail cuts into the preseting length size;

(2) will the decaptitate silicon single crystal rod of tail vertically cuts into the thin slice of setting thickness;

(3) with the thin slice trimming skin of well cutting, obtain final finished.

The utility model large size class single crystal seed area is large, and splicing quantity is few, is more conducive to the ingot casting of class monocrystalline.Large size class single crystal seed technique can be made more seed crystal product in the silicon single crystal rod of equal length and diameter, because of the use of its maximum range the area of a circle of whole silicon single crystal rod so that utilization ratio improves greatly, also make production cost obtain reduction.

Description of drawings

Fig. 1,2 is prior art cutting synoptic diagram, and dotted line is line of cut among the figure;

Fig. 3 is the utility model cutting synoptic diagram, and dotted line is line of cut among the figure;

Fig. 4 is the utility model synoptic diagram.

Embodiment

A kind of large size class single crystal seed as shown in Figure 4, its length is 700-1200mm, and thickness is 5-30mm, and width is 50-400mm.

A kind of production technique of large size class single crystal seed comprises the steps: as shown in Figure 3

(1) the major diameter single crystal silicon rod is decaptitated tail cuts into the preseting length size;

(2) will the decaptitate silicon single crystal rod of tail vertically cuts into the thin slice of setting thickness;

(3) with the thin slice trimming skin of well cutting, obtain final finished.

With 8 cun silicon single crystal rod diameter 200mm for example, length cutting 780mm, its maximum product can be made 780*196, head and shoulders above the 156*156 product in the stack pile situation.

Claims (1)

1. large size class single crystal seed, it is characterized in that: its length is 700-1200mm, and thickness is 5-30mm, and width is 50-400mm.

Images