KR200389111Y1 - Heater assembly of heat treatment equipment - Google Patents

Abstract

The present invention relates to a heater assembly of a heat treatment apparatus that can prevent the heating wire from twisting by improving a structure for fixing the heating wire, and a method of manufacturing the same. The heater assembly of the present invention has a heat generating resistor spirally disposed on the outer circumference of the process tube and a primary heat insulating layer formed by being plastered in a cylindrical shape to surround the heat generating resistor, and between the heat generating resistor and the primary heat insulating layer, It has a gap to free movement due to expansion. This gap allows the heat generating resistor to expand outwards, thereby preventing the heat generating resistor from bending in the vertical direction. When the heat generating resistor is separated from the primary heat insulating layer, an instantaneous change in temperature (precision control of temperature) is possible.

Description

HEATER ASSEMBLY OF HEAT TREATMENT EQUIPMENT}

The present invention relates to a semiconductor manufacturing facility, and more particularly, to a heater assembly of a heat treatment apparatus that can prevent the heating wire from twisting by improving a structure for fixing the heating wire.

Conventionally, in various processes of a substrate to be processed, for example, a semiconductor substrate, a thin film forming apparatus such as a CVD apparatus, an epitaxial growth apparatus, an oxide film forming apparatus, and a thermal diffusion apparatus such as a thermal diffusion apparatus for doping impurities Used.

A general diffusion type heat treatment apparatus used for various heat treatments of the semiconductor substrate includes a process tube having a plurality of substrates loaded therein, and a heater assembly installed to surround the process tube. The heater assembly has a structure having a heating wire disposed on the outer circumference of the process tube, a heat insulating member disposed to surround the heating wire, and hot wire supports supporting the heating wire at regular intervals.

However, the existing heater assembly has various problems as follows.

As shown in Figure 1 and 2, the heating wire support 12 is a structure that fits side by side because it takes a lot of time to assemble, the heat wire support 12 can be easily pulled out laterally (fitting direction) disadvantages Have

In addition, the heating wire is installed in close contact with the heat insulator, and the wire is bent upward and downward due to the heat insulator during expansion / contraction of the heat wire (linear expansion coefficient of 15. * 10 ^-6 cm / ° C). As a result, short-circuiting occurs between adjacent hot wires. In addition, in the past, there is almost no gap between the hot wire supporter and the hot wire, which pushes the ceramic support during the expansion of the hot wire, thereby causing a local depression of the hot wire.

In addition, the heater assembly 10 is a severe vibration and noise generated in the heating wire during the initial temperature rise (between 150-500 ℃), due to such vibration, the heat wire support 12 is laterally dropped in a row. In addition, the existing heat insulating material is made by stacking the heat insulating material in two layers as if it is a brick, and when the temperature rises to 1100-1275, the heat insulating material cannot withstand falling or shrinkage due to shrinkage. This not only causes a loss of temperature but also deforms the hot wire as it moves the hot wire support.

Figure 2 is a picture showing the inside of the heater assembly, it can be seen that the heating wire support 12 is bent due to the heating wire 14 is bent, even the inner heat insulating member 16 is missing. In severe cases, the hot wires come into contact with each other, causing a problem that the hot wires are disconnected. In addition, as the hot wire support is skewed to the side, the internal insulation member 16 is pushed to the side, and a gap is formed between the insulation materials, thereby causing a problem in temperature control. These problems are a major cause of shortening the life of the heater assembly.

As such, stable fixing of the temperature sensor affects the precise temperature control of the heater, the period of use of the heater, and the thickness of the substrate film.

The present invention is to solve such a conventional problem, an object of the present invention is to provide a heater assembly of a heat treatment apparatus of a new type that can prevent the bending of the heating wire by freeing the contraction and expansion of the heating wire.

Another object of the present invention is to provide a heater assembly of a new type of heat treatment apparatus that can improve temperature uniformity and minimize heat loss.

Still another object of the present invention is to provide a heater assembly of a new type of heat treatment apparatus capable of improving workability of fixing a heating wire.

Heater assembly of the heat treatment apparatus according to the present invention for achieving the above object is a heating resistor disposed spirally on the outer periphery of the process tube; A support member having a support groove into which the heat generating resistor is inserted and supported; A primary heat insulating layer formed by being plastered in a cylindrical shape so as to surround the heating resistor; A secondary thermal insulation layer surrounding the thermal insulation layer; And a case surrounding the secondary heat insulation layer.

According to an embodiment of the present invention, the heater assembly of the heat treatment apparatus has a gap between the heat generating resistor and the primary heat insulating layer so that the movement according to the expansion of the heat generating resistor is free.

According to an embodiment of the present invention, the support member includes a front end portion formed with the support groove; The rear end portion extends from the front end portion, and the rear end portion of the support member is buried and fixed to the primary heat insulation layer.

According to an embodiment of the present invention, the rear end has a T-shape having protrusions protruding to both sides in order to prevent falling or moving from the primary heat insulating layer.

According to an embodiment of the present invention, the support member is made of a rod shape; At the front end of the support member, the support grooves are formed at equal intervals up and down, and at the rear end of the support member, protrusions protruding to both sides are formed. The fitting protrusion and the fitting groove are formed.

According to an embodiment of the present invention, the support groove has an inlet in which the heating resistor is inserted, and the size of the support groove may be wider than that of the heating resistor so that movement due to vibration and expansion of the heating resistor is free.

Method of manufacturing a heater assembly of the present invention for achieving the above object comprises the steps of disposing a heating wire in a spiral; Supporting the hot wire using a plurality of support members to maintain the spirally arranged hot wires; Wrapping a circumference of the hot wire with paper to create a paper layer; Plastering the primary insulation of the porridge state to a certain thickness on the outer peripheral surface of the paper to make a primary insulation layer; Making a secondary insulation layer by wrapping an outer circumferential surface of the primary insulation with a secondary insulation; And covering the case on the outer peripheral surface of the secondary insulation.

According to an embodiment of the present invention, the method of manufacturing the heater assembly may include removing the paper layer to create a gap between the heating wire and the primary heat insulating layer, and for a predetermined time at a predetermined temperature to solidify the primary heat insulating layer. Further comprising the step of drying.

According to an embodiment of the present invention, the paper layer removing step may be removed by incineration of the paper by the temperature of the heating wire by heating the heating wire.

According to an embodiment of the present invention, the rear end of the support member when making the primary heat insulating layer may be embedded in the primary heat insulating layer.

Hereinafter, with reference to the accompanying drawings the heater assembly of the heat treatment apparatus according to the present invention will be described in detail.

Advantages of the present invention as compared to the prior art will become apparent through the detailed description and claims with reference to the accompanying drawings. In particular, the present invention is well pointed out and claimed in the claims. However, the present invention may be best understood by reference to the following detailed description in conjunction with the accompanying drawings. Like reference numerals in the drawings denote like elements throughout the various drawings.

3 is a partial cross-sectional perspective view of the heater assembly of the heat treatment apparatus according to the embodiment of the present invention. 4 is a partial cross-sectional plan view of the heater assembly of the heat treatment apparatus according to the embodiment of the present invention. 5 is a view showing the support member shown in FIG.

The heater assembly 100 of the heat treatment apparatus according to the present invention may be used in a vertical furnace apparatus that performs a process of diffusing impurities of a desired conductivity type in a substrate under a high temperature atmosphere. Here, the furnace apparatus has a process tube that accommodates a boat on which a plurality of substrates are loaded, and a heater assembly is installed outside the process tube to heat the process tube to a predetermined temperature.

3 to 5, the heater assembly 100 includes a heat generating resistor 110, support members 130, a primary insulation layer 140, a secondary insulation layer 150, and a case 160.

The heat generating resistor 110 is disposed on the outer circumference of the process tube (indicated by an imaginary line in FIG. 4; 200), and a heater (hereinafter referred to as a hot wire) made of Fe Cr Al is used as the heat generating resistor. By using such a hot wire 110, it is possible to heat the inside of a process tube to about 1200 degreeC high temperature, for example.

3 to 5, the heating wire 110 is helically disposed on the outer circumference of the process tube, which is supported by the support members 130. In this embodiment, the support members 130 are installed to support the hot wire at 45 degree intervals.

The support member 130 has a long rod shape, and the fitting protrusion 132a and the fitting groove 132b are formed at the upper and lower ends of the supporting member. The support members 130 are mutually coupled in a line by the fitting protrusion 132a and the fitting groove 132b. The fitting protrusion and the fitting groove are formed in a dove tail shape to prevent the supporting member from moving forward or backward.

The support member 130 has a front end portion 134 in which the support groove 135 into which the heating wire is inserted and is supported at equal intervals up and down, and a rear end portion 136 in which protrusions 136a protruding to both sides are formed. The rear end 136 has a T-shape. The support member 130 is prevented from being moved or moved from the primary heat insulation layer 140 by forming the protrusion 136a at the rear end. In particular, since the support member 130 of the present invention is a structure having a plurality of support grooves 135, the assembly is superior to the existing structure. In particular, the support groove 135 has a passage 135a partially open in the direction of the process tube, and the heating wire is inserted through the passage 135a and placed in the support groove 135. Since the support groove 135 has a structure in which a part of the support tube 135 is opened, the heat of the heating wire 110 is not blocked by the support member 130, so that a minute temperature change of the heating wire can be immediately transmitted to the process tube. It has a special effect. In addition, the support groove 135 having a structure in which a part of the process tube 200 is open toward the process tube 200 has an advantage of sufficiently coping with heat deformation of the heating wire as compared with the completely closed support groove. In addition, the inlet 135a of the support groove 135 is 1.0mm larger than the diameter of the heating wire so that it can be easily assembled, and the size of the support groove is larger than the diameter of the heating wire to ensure free movement due to vibration and expansion of the heating wire. It was to be able to cope with the heat deformation of the heating wire sufficiently. The support members are made of ceramic material.

On the other hand, the support member 130 is supported by the primary heat insulating layer 140. That is, the rear end of the support member is positioned and fixed in the primary heat insulation layer 120.

The primary heat insulation layer has a cylindrical shape to surround the heating wire 110, and has a thickness to cover the rear end portion 136 of the support member 130. There is a gap 180 having a predetermined interval (3-5 mm) between the primary heat insulation layer 140 and the heating wire 130, and the gap 180 is used as a free space for freely moving according to the expansion of the heating wire. In addition, as a raw material of the primary heat insulation layer 140, a ceramic fiber is used, for example. The primary heat insulation layer is formed by making ceramic fibers into a dough state, plastering them to a predetermined thickness around the heating wire, and then drying them. In this way, the primary insulation layer is not made by stacking the insulating material in the form of a block, but by drying the ceramic fiber in the dough state to a certain thickness and drying it, so that a gap due to the shrinkage of the insulation material does not occur at a high temperature in the future, thereby preventing heat loss. Can be. And the support member 130 can be fixed more firmly.

The primary thermal insulation layer 140 is wrapped by the secondary thermal insulation layer 150. As a material of the secondary heat insulation layer 150, a cotton insulation material (eg, glass fiber) is used, and the secondary heat insulation layer 150 is wrapped by the case 160.

As such, by using the primary and secondary heat insulating layers 140 and 150, it is possible to efficiently heat the process tube by reducing the amount of heat lost as radiant heat and conduction heat from the heat amount from the heat ray.

6A to 6G are views sequentially showing a manufacturing process of the heater assembly according to the present invention.

The manufacturing process of the heater assembly will be described with reference to FIGS. 6A to 6G and 7 as follows.

First, the heating wire 110 is formed in a spiral (s12). At this time, a space in which the process tube is positioned is provided inside the heating wire 110. The spiral heating wire 110 is fitted into and fixed to the support grooves 135 of the plurality of support members 130 (FIG. 6A) (s14). When the fixing of the heating wire is completed by the supporting members 130, the paper layer 182 is wrapped around the heating wire to form a paper layer (FIG. 6B) (s16). This paper layer may be made in advance before the hot wire is fixed by the support member. This paper layer is later incinerated and removed. On the outer circumferential surface of the paper layer 182, a ceramic fiber (primary heat insulator) in a porridge state made in advance is plastered with a predetermined thickness to make a primary heat insulation layer 140 (FIG. 6C) (s20). At this time, the thickness of the primary heat insulating layer 140 is preferably such that it can be covered at least to the rear end of the support member. In order to harden the primary insulation layer 140 thus made, the drying process is performed for 4-6 hours at a temperature of about 150 degrees. This drying process may proceed after making the secondary thermal insulation layer. Then, the secondary heat insulation layer 150 is covered on the outer circumferential surface of the primary heat insulation layer (FIG. 6D) (s22), and the case 160 is covered on the outer circumferential surface of the secondary heat insulation layer (FIG. 6E) (s24). Then, the paper layer 182 is incinerated and removed (FIG. 6F) (s26). Incineration of the paper layer 182 is that when the heating wire is heated by supplying electricity to the heating wire, the paper layer is incinerated and removed by the high temperature. When the paper layer is removed, a gap 180 is formed between the heating wire and the primary heat insulating layer by the thickness of the paper (3-5 mm). The gap 180 is capable of extinguishing the expansion when the temperature of the heating wire 110 is elevated, there is no stress of the heating wire, the movement of the heating wire 110 is free, the heating wire can be expanded to the outside and the heating wire is bent in the vertical direction Is prevented. In particular, since the heat insulating material of the primary heat insulating layer 140 has a later reaction of instantaneous temperature than the hot wire, when the hot wire is separated from the primary heat insulating layer 140, a momentary change of temperature (precision control of temperature) is possible. Here, the drying process of a primary heat insulation layer may be performed immediately after making a primary heat insulation layer or just after making a secondary heat insulation layer.

The above detailed description illustrates the present invention. In addition, the foregoing description merely shows and describes preferred embodiments of the present invention, which can be used in various other combinations, modifications, and environments. In addition, changes or modifications may be made within the scope of the inventive concept disclosed in the present specification, the scope equivalent to the disclosed contents, and / or the scope of the art or knowledge in the art. The above-described embodiments are intended to describe the best state in carrying out the present invention, and the use of other inventions such as the present invention to other conditions known in the art, and the specific fields of application and uses of the invention required. Various changes are also possible. Thus, the detailed description of the invention is not intended to limit the invention to the disclosed embodiments. Also, the appended claims should be construed to include other embodiments.

As described in detail above, the present invention uses an elongated support member in which a plurality of support grooves in which a heating wire is inserted is formed, and thus, the assembly is superior to a support member having a single support groove.

In addition, since the present invention has a structure in which the supporting groove is partially opened in the direction of the process tube, the heat of the heating wire is not blocked by the supporting member, so that a minute temperature change of the heating wire can be immediately transmitted to the process tube. Have

In addition, the present invention is because the opening of the support groove is 1.0mm larger than the diameter of the heating wire can be easily inserted into the heating wire, the size of the supporting groove larger than the diameter of the heating wire to ensure free movement due to the vibration, expansion of the heating wire It was possible to cope with the heat deformation of the hot wire sufficiently.

In addition, the present invention is made by forming a primary heat insulating layer kneading the ceramic fiber to a predetermined thickness around the heating wire and dried. During the process, even at high temperatures, no gap is generated due to shrinkage of the insulation, thereby preventing heat loss. And the support member can be fixed more firmly.

In addition, the present invention is made by the gap between the heating wire and the primary heat insulating layer as much as the paper thickness (3-5mm), it is possible to expand the heating wire to the outside to prevent the heating wire to bend in the vertical direction, the heating wire is primary Staying away from the insulation layer allows for instantaneous changes in temperature (precise control of temperature).

1 shows a part of a heater assembly used in a general heat treatment apparatus;

Figure 2 is a photograph showing the problems inside the heater assembly used in the general heat treatment apparatus;

3 is a partial cross-sectional perspective view of the heater assembly of the heat treatment apparatus according to the embodiment of the present invention;

4 is a partial cross-sectional plan view of the heater assembly of the heat treatment apparatus according to the embodiment of the present invention;

FIG. 5 shows the support member shown in FIG. 4; FIG.

6A to 6G are diagrams for sequentially describing a manufacturing process of the heater assembly.

<Description of Symbols for Major Parts of Drawings>

110: heating wire

130: support member

140: primary insulation layer

150: secondary insulation layer

160: case

Claims (7)

In the heater assembly of the heat treatment apparatus: A heat generating resistor spirally disposed on an outer circumference of the process tube; A support member having a support groove into which the heat generating resistor is inserted and supported; A primary heat insulating layer formed by being plastered in a cylindrical shape so as to surround the heating resistor; A secondary thermal insulation layer surrounding the thermal insulation layer; And And a case surrounding the secondary insulating layer. The method of claim 1, The heater assembly of the heat treatment apparatus The heater assembly of the heat treatment apparatus, characterized in that the gap between the heat generating resistor and the primary heat insulating layer so that the movement according to the expansion of the heat generating resistor is free. The method of claim 1, The support member A front end portion formed with the support groove; Has a rear end extending from the leading end, The heater assembly of the heat treatment apparatus, characterized in that the rear end portion of the support member is buried and fixed to the primary heat insulation layer. The method of claim 3, The rear end is a heater assembly of the heat treatment apparatus, characterized in that the T-shape having projections protruding on both sides to prevent falling or moving from the primary heat insulating layer. The method of claim 1, The support member Consisting of rods; The support groove is formed at the front end of the support member at equal intervals up and down, the rear end of the support member is formed with protrusions protruding to both sides, Heater assembly of the heat treatment apparatus, characterized in that the fitting projection and the fitting groove is formed on the upper end and the rear end of the support member so that the support members are mutually coupled in a line. The method of claim 1, The support groove has an inlet in which the heating resistor is inserted, The heater assembly of the heat treatment apparatus, characterized in that the size of the support groove is wider than the heating resistor so that the movement due to the vibration, expansion of the heating resistor is free. The method of claim 1, The heating resistor is a heater assembly of the heat treatment apparatus, characterized in that the spiral (Spiral) heating wire.