JPS5947020B2 - Mold material for glass molding - Google Patents

Description

[Detailed description of the invention] The present invention has good demoldability as a glass molding mold, has a long continuous service life, and has high oxidation and corrosion resistance, making it possible to significantly improve productivity in glass molding work. This invention relates to a mold material for glass molding that has excellent properties such as.

Conventionally, in glass molding such as cathode ray tube glass molding where the surface texture of the molded glass is particularly important, 13Cr stainless steel (such as SUS420J2) has been used as a mold material.

However, when 13Cr stainless steel is used as the mold material, a scratch pattern appears on the side of the mold when the mold is cut out, so after repeated polishing and rework several times, the mold is discarded as defective. Furthermore, even if the side surface was repaired overlay, the repaired portion would be transferred to the glass surface, resulting in a problem of 1, especially in applications where the glass surface is important.

Further, in the case of 13Cr stainless steel, the thermal conductivity is relatively low, and there is a limit to increasing the number of glass molding cycles per unit time.

By incorporating W and Mo into a Ni-based alloy that has relatively good demoldability, the present invention further improves demoldability and provides oxidation and corrosion resistance superior to conventional 13 Cr stainless steel. The object of the present invention is to provide a mold material for glass molding that has the following properties, has good thermal conductivity, and can improve the efficiency of glass molding operations.

The glass molding mold material of the present invention has a C0.03 to C0.3
W3.0 and Si0.05 to 1.20. It contains OO~18.00%, and has a Mo of 3.00~15.00%.
and W3.00 to 18.0.
0% and Mo content of 3.00 to 15.00%.

Examples will be described below.

Table 1 shows examples of chemical components of the materials of the present invention.

Table 2 shows the results of the demoldability test for the materials of the present invention.

The test mold is a 60m x 60mm x 120trrmt plunger mold, with a thickness of 1 between the bottom mold (female mold) and the bottom mold (female mold).
100 pieces of 0-grade glass were hot-formed, and the number of scratches with a length of 1.5 mm or more that occurred on the side surface was read.

From Table 2, it can be seen that the material of the present invention clearly has fewer scratches and has better demoldability than the comparative 13Cr stainless steel.

Furthermore, when comparing the effects of W and Mo, it can be seen that W has a greater effect.

Furthermore, it can be seen that an increase in the amount of C also brings about a slight improvement in demoldability.

Table 3 shows the thermal conductivity of the materials of the present invention.

Table 3 shows that the material of the present invention has better thermal conductivity than the comparative material, 13Cr stainless steel.

Table 4 shows the oxidation resistance of the materials of the present invention.

From Table 4, it can be seen that the materials of the present invention clearly have greater oxidation resistance than the comparative materials.

Table 5 shows the corrosion resistance of the materials of the present invention against HF gas.

Table 5 shows the corrosion weight loss when a sample of 15φ x 30t was held in HF gas for 50 hours.

As is clear from Table 5, the corrosion resistance of the materials of the present invention in an HF gas atmosphere is much higher than that of the comparative materials.

This is due to the effect of containing Mo and W in the Ni base.

In this case, Mo has a relatively greater effect of improving corrosion resistance than W.

Table 6 shows the tensile properties of the materials of the present invention.

Table 6 shows that the materials of the present invention have appropriate strength and excellent ductility.

Next, the reason for limiting the components of the material of the present invention will be described.

C is added to form a carbide between C, W, and Mo to obtain the effect of suppressing the growth of crystal grains, and to form a solid solution in the warped base to impart strength.

However, if it is too large, the amount of free carbides increases, which is accompanied by segregation and deterioration of corrosion resistance and oxidation resistance. 03% or more.

A more desirable range for C is 0.06-0.18%.

Si is added as a deoxidizing element to improve the oxidation resistance.

However, if the content is too high, the thermal conductivity will decrease, so the content should be 1.20% or less, and if the content is too low, the effect of addition cannot be obtained, so the content should be 0.05% or more.

A more desirable range of Si is 0.20 to 0.60.

Ni is the most basic element constituting the material of the present invention.

Ni is an element that originally has low wettability with glass and good demoldability, and is known to have relatively good thermal conductivity, and its oxidation resistance is also superior to 13Cr stainless steel in glass molding applications. It was confirmed that round W was used as the base component of the material of the present invention and is an element that itself has good demoldability.
When dissolved in Ni, it has the effect of greatly improving the demoldability of the solid solution, and also has the effect of imparting strength necessary as a mold material for glass molding.

Therefore, W is added to obtain the above effect, but if its content is too large, it will lower the thermal conductivity and it will be difficult to maintain the characteristics of the present invention, so it should be added to 1s, oO% or less, and if it is too low, it will be difficult to maintain the characteristics of the present invention. Since the effect of the above addition cannot be obtained, the content is set at 3.00% or more.

A more desirable range of W is 5.00 to 13.00 inches.

Mo dissolves in Ni to improve demoldability, increase strength, and greatly improve corrosion resistance.

Therefore, if demoldability is important, W is mainly contained, and if corrosion resistance is also important, Mo and W are contained together or singly.

However, if it is too large, it will reduce the thermal conductivity, so 15.00
% or less; if it is too low, the effect of addition cannot be obtained, so
．． 00% or more.

More desirable content range of Mo &\5.0 when added alone
It is in charge of 0 to 10.00.

Also, W. A more desirable content range in the case of Mo composite addition is W3. OO~6. OO%, MO3,00~5.
It is 0%.

As described above, the material of the present invention has extremely good demoldability, excellent thermal conductivity, oxidation resistance, and corrosion resistance in a fluorine gas atmosphere, so it can be applied to glass molds. This has many excellent effects, such as improving mold life, increasing the number of molding cycles per unit time, and improving work efficiency.

Claims (1)

[Claims] I C0.03~0.30, Si0.05~1. ．． 2
Section 0, W3. A glass molding mold material containing 0 to 18.00%, with the remainder consisting of Ni excluding ordinary impurities. 2C0.06-0.18, Si0.20-0.60, W5.00-13. The mold material for glass molding according to claim 1, wherein the glass molding mold material contains Ni. 3C0.03-0.30, Si0.05-1.20%
, Mo 3.00 to 15.00%, the remainder being Ni excluding ordinary impurities. 4C 0.06 to 0.18%, SiO 20 to 0.60%, Mo 5.00 to 10.00%, and the remainder consists of Ni excluding usual impurities. Mold material for glass molding. 500.03~0.30 ratio, Si0.05~1.20%
, W3. OO~18.00%, Mo 3.00~15.
00%, with the remainder consisting of Ni excluding normal impurities. 6 C0.06-0.18, Si0.20-0.6
Section 0, W3. OO~6.00%, Mo 3.00~5
．． 6. The mold material for glass molding according to claim 5, wherein the glass molding mold material contains Ni.