TWI532853B - Anti-depression low shrinkage mirror plate - Google Patents

Description

Anti-sag low expansion and contraction mirror plate

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an insulating sheet, and more particularly to an anti-recessed low expansion and contraction mirror plate having a surface coated with a modified coating.

In the manufacture of the main substrate of the production circuit board (PCB), a voltage machine is required to press a plurality of different materials. The working principle of the voltage machine is to heat the processed adhesive through copper foil (or aluminum foil). Resin material, and pressurizing the multilayer material for at least half an hour by applying a certain pressure, thereby producing a circuit board substrate, and in the process of pressing using a voltage machine, for a cost, a single press operation often needs to be simultaneously pressed. a plurality of circuit board substrates, and in order to prevent a plurality of circuit board substrates from being affected when pressed, it is necessary to stack them and insert a special metal plate between them, which has insulation and heat transfer. , the role of support and separation, this special high-flatness metal plate is called the mirror plate.

The biggest difference between a mirror plate and a common insulating plate is that it has a special coating on its surface. This coating has a great influence on the energy of the mirror plate. During the pressing process, the energy requirements of the mirror plate are very high. When the voltage machine is in operation, Both high-temperature heat (greater than 300 ° C) and strong pressure (greater than 50 MPa), which requires the mirror plate to have excellent heat-resistant pressure, that is, the mirror plate needs to have a high ultimate temperature tolerance and ultimate withstand pressure, and More importantly, the surface of the mirror plate must remain very smooth and smooth after repeated hot pressing, and the surface is not sunken, and there is no expansion and contraction, which is currently impossible in the prior art. It is required that the mirror plate of the prior art is generally used for about 150 times at a normal temperature, and the surface thereof begins to dent, causing the mirror plate to fail, and it can be used only after about 60 times at a high temperature.

In view of the deficiencies of the prior art, the object of the present invention is to provide a non-recessed low expansion and contraction mirror plate, which has the advantages of long-term use under high temperature and high pressure conditions, low expansion and contraction amplitude, and flat surface without depression. .

The technical solution of the present invention is summarized as follows:

The utility model relates to a non-recessed low expansion and contraction mirror plate, which is based on a stainless steel plate, and a surface of the stainless steel plate is provided with a coating comprising 30 to 32 parts by weight of alumina, 30 to 32 parts by weight of cerium oxide, 30 ～32 parts by weight of cerium oxide, 6 to 8 parts by weight of cerium oxide, 6 to 8 parts by weight of silver oxide, 2 to 4 parts by weight of palladium oxide, and 2 to 4 parts by weight of cerium oxide.

In the above-mentioned anti-pitching low expansion and contraction mirror plate, wherein the coating layer further comprises 2 to 4 parts by weight of cerium oxide.

In the above-mentioned anti-pitching low expansion and contraction mirror plate, wherein the coating layer further comprises 2 to 4 parts by weight of boron nitride.

In the above-mentioned anti-pitching low expansion and contraction mirror plate, wherein the coating layer further comprises 2 to 4 parts by weight of cerium oxide and 2 to 4 parts by weight of cerium oxide.

In the above-mentioned anti-pitching low expansion and contraction mirror plate, wherein the coating layer further comprises 2 to 4 parts by weight of cerium oxide.

In the above-mentioned anti-pitching low expansion and contraction mirror plate, wherein the coating layer further comprises 2 to 4 parts by weight of zinc oxide.

In the above-mentioned anti-pitching low expansion and contraction mirror plate, wherein the stainless steel plate has a linear thermal expansion coefficient of 12 to 16 ppm/°C.

In the above-mentioned anti-pitching low expansion and contraction mirror plate, wherein the stainless steel plate has a thickness of 0.2 to 3 mm.

The above described features and advantages of the present invention will be more apparent from the following description.

The present invention will be further described in detail below with reference to the embodiments, so that those skilled in the art can refer to the description.

In the present invention, a recessed low expansion and contraction mirror plate according to an embodiment is provided, which is a stainless steel plate as a base material, and a surface of the stainless steel plate is provided with a coating comprising: 30 to 32 parts by weight of alumina, 30 to 32 parts by weight. The cerium oxide, 30 to 32 parts by weight of cerium oxide, 6 to 8 parts by weight of cerium oxide, 6 to 8 parts by weight of silver oxide, 2 to 4 parts by weight of palladium oxide, and 2 to 4 parts by weight of cerium oxide.

The material used in the present invention may preferably be a nano-sized powder or a micron-sized powder.

As another embodiment of the present invention, the coating further comprises 2 to 4 parts by weight of cerium oxide. Cerium oxide can improve the mechanical strength, hardness and impact energy of the coating at high temperatures, but it should be noted that the amount of cerium oxide added should be limited. If the amount of cerium oxide added is less than 2 parts by weight, the synergy cannot be initiated. The effect can not effectively improve the mechanical strength, hardness and impact energy of the coating at high temperatures; if the amount of cerium oxide added is more than 4 parts by weight, the cerium oxide will increase the internal rigidity of the coating during combustion, thereby making the coating It becomes brittle and has poor weather resistance. It is easy to crack or sag when the thickness of the coating is uneven, which seriously affects the service life of the coating.

As another embodiment of the present invention, the coating further comprises 2 to 4 parts by weight of boron nitride. It has been found that boron nitride can reduce the sensitivity and expansion range of the mirror coating to temperature difference and pressure difference, thereby reducing the expansion and contraction rate of the mirror plate. However, the addition amount of boron nitride must also be limited, if nitrogen If the addition amount of boron is less than 2 parts by weight, the synergistic effect cannot be initiated, and the expansion and contraction rate of the mirror plate cannot be effectively suppressed, so that the surface of the coating plate is wrinkled, scratched or sunken after 50 times of use; When the boron is added in an amount of more than 4 parts by weight, the boron nitride is liable to be repelled during combustion, which causes cerium oxide and cerium oxide to deposit on the bottom of the coating, resulting in uneven mixing of the components inside the coating. Thereby affecting the original structural stability of the coating.

As another embodiment of the present invention, the coating layer further comprises 2 to 4 parts by weight of cerium oxide and 2 to 4 parts by weight of cerium oxide. It has been found that when yttrium oxide and yttrium oxide are present at the same time, the two can produce synergistic effects with each other, and jointly improve the wear resistance and surface anti-recessing energy of the coating at high temperatures, especially above 450 ° C, but if this is the case When there was only one of them, it was found that there was almost no improvement in coating energy. Moreover, the addition amount of cerium oxide and cerium oxide must be strictly limited, and if it deviates from the preferred numerical range, the improvement of the coating energy of both can not be optimal.

As another embodiment of the present invention, the coating further comprises 2 to 4 parts by weight of cerium oxide, which can suppress the bursting rate of the coating during the smoldering and improve the high temperature resistance of the coating, and not only the cerium oxide but also It suppresses the sensitivity of the inside of the coating to the temperature difference and differential pressure, so that the surface of the coating is more stable and durable. However, the experimental data also shows that the amount of cerium oxide added should be limited, and the inappropriate addition amount will have a negative effect.

As still another embodiment of the present invention, wherein the coating further comprises 2 to 4 parts by weight of zinc oxide. It has been unexpectedly discovered through experiments that zinc oxide can also improve the expansion and contraction amplitude of the mirror plate by using boron nitride and cerium oxide alone or in combination, so that more desirable results can be obtained. In the same way, as a significant amount of trace additive, the amount of addition should be limited, and the inappropriate addition amount will lead to the failure of zinc oxide.

As still another embodiment of the present invention, the stainless steel sheet has a linear thermal expansion coefficient of 12 to 16 ppm/° C. Because the mirror plate is mainly used to manufacture PCB boards, an important main material in the PCB board is copper plate. The coefficient of thermal expansion of copper wire is 16.7ppm/°C. Therefore, in order to prevent the copper plate from being crushed or broken during hot pressing, In theory, the coefficient of thermal expansion of the mirror plate should be as close as possible to the thermal expansion coefficient of copper. However, it is found by accident that this is not the case. In hot pressing, high temperature is achieved by energization, and in the case of high temperature energization, different metals. The linear thermal expansion coefficient varies, and the degree of deviation of the different metal materials is also different. Therefore, for the technical solution of the present case, it is not the best choice to select a stainless steel plate having a linear thermal expansion coefficient of 16.1 to 17 ppm/° C. The coefficient of thermal expansion is preferably from 12 to 16 ppm/°C, more preferably from 13 to 15 ppm/°C, and most preferably 14 ppm/°C. Because the material composition of stainless steel is very complicated, there are different models on the market, and different specific components have different coefficients of thermal expansion. In this case, it is not necessary to limit the specific composition of the stainless steel plate, and only need to limit the coefficient of thermal expansion of the wire. If the coefficient of thermal expansion of the stainless steel plate is less than 12ppm/°C, the surface of the PCB board in contact with the mirror plate may be wrinkled; if the coefficient of thermal expansion of the stainless steel plate is greater than 16ppm/°C, it is in contact with the mirror plate during hot pressing. Cracks appear on the surface of the PCB.

As still another embodiment of the present invention, the stainless steel plate has a thickness of 0.2 to 3 mm. The thickness of the stainless steel plate mainly determines the firmness of the entire mirror plate. If the thickness of the stainless steel plate is less than 0.2 mm, the plate plate itself is under pressure and is prone to breakage during hot pressing; if the thickness of the stainless steel plate is greater than 3 mm, The surface tension of the coating is too large, and the coating is prone to cracking during hot pressing. At the same time, the excessive thickness also reduces the number of single stacks when the PCB board is produced by stacking, thereby increasing the production cost. .

The preparation method of the mirror plate is as follows: First, the materials are weighed according to the above materials and mixed with water to mix the powders of the materials, and then brushed on the surface of the stainless steel plate, the thickness of the brush coating can be fully covered on the surface of the steel plate, generally 10~ 20 μm, simmered in an inert gas atmosphere at 800 ° C for 2 hours, and incubated at 200 ° C for 1 hour to obtain a mirror plate.

Table 1 lists the specific components of the different embodiments and the energy parameters of the resulting mirror plates:

Table I

<TABLE style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; MARGIN: auto auto auto -32pt; WIDTH: 518.4pt; BORDER-COLLAPSE: collapse; BORDER-TOP: medium none; BORDER-RIGHT: medium Mso-border-alt: solid windowtext .5pt; mso-yfti-tbllook: 480; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt; mso-border-insideh: .5pt solid windowtext; mso-border-insidev : .5pt solid windowtext" class="MsoNormalTable" border="1" cellSpacing="0" cellPadding="0" width="691"><TBODY><TR><TD><br /></TD>< TD>Embodiment 1<br /></TD><TD>Embodiment 2<br /></TD><TD>Embodiment 3<br /></TD><TD>Example 4<br / ></TD><TD>Embodiment 5<br /></TD><TD>Embodiment 6<br /></TD><TD>Embodiment 7<br /></TD><TD> Embodiment 8<br /></TD><TD>Embodiment 9<br /></TD><TD>Embodiment 10<br /></TD><TD>Example 11<br />< /TD><TD>Example 12<br /></TD></TR><TR><TD>Alumina<br /></TD><TD>30 copies<br /></TD> <TD>32 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /></ TD><TD>32 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /> </TD>< TD>32 parts<br /></TD><TD>30 parts<br /></TD><TD>32 parts<br /></TD></TR><TR><TD>铪铪<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /></TD><TD> 32 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /></TD>< TD>32 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /></TD> ><TD>32 copies<br /></TD></TR><TR><TD>矽矽<br /></TD><TD>30 copies<br /></TD><TD> 32 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /></TD>< TD>32 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /></TD> ><TD>32 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD></TR><TR><TD> Cerium oxide<br /></TD><TD>6 copies<br /></TD><TD>8 copies<br /></TD><TD>6 copies<br /></TD>< TD>8 copies<br /></TD><TD>6 copies<br /></TD><TD>8 copies<br /></TD><TD>6 copies<br /></TD> ><TD>8 copies<br /></TD><TD>6 copies<br /></TD><TD>8 copies<br /></TD><TD>6 copies<br />< /TD><TD>8 copies<br /></TD></TR><TR><TD>Silver oxide<br /></TD><TD>6 copies<br /></TD>< TD>8 copies<br /></TD><TD>6 copies<br /></TD><TD>8 copies<br /></TD><TD>6 copies<br /></TD> ><TD>8 <br /></TD><TD>6 copies<br /></TD><TD>8 copies<br /></TD><TD>6 copies<br /></TD><TD> 8 parts<br /></TD><TD>6 parts<br /></TD><TD>8 parts<br /></TD></TR><TR><TD>Palladium oxide<br </TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies <br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD> 4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD>< TD>4 parts<br /></TD></TR><TR><TD>铋 铋<br /></TD><TD>2 parts<br /></TD><TD>4 parts <br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD> 4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD>< TD>4 parts<br /></TD><TD>2 parts<br /></TD><TD>4 parts<br /></TD></TR><TR><TD>镧镧<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>2 copies<br /></TD><TD>4 copies <br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD> 4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD>< TD>4 parts<br /></TD></TR><TR><TD>boron nitride<br /></TD><TD>0<br /></TD><TD>0< Br /></TD><TD>0<br /></TD><TD>0<br /></TD> ><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br />< /TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br / ></TD></TR><TR><TD>锑锑<br /></TD><TD>0<br /></TD><TD>0<br /></TD>< TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD> 2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD>< TD>2 copies<br /></TD><TD>4 parts<br /></TD></TR><TR><TD>铊 铊<br /></TD><TD>0< Br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br / ></TD><TD>0<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD></TR>< TR><TD>钌钌<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD> ><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD>< TD>0<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD> <TD>4 parts<br /></TD></TR><TR><TD>Zinc oxide<br /></TD><TD>0<br /></TD><TD>0< Br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br / > </TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></ TD><TD>2 parts<br /></TD><TD>4 parts<br /></TD></TR><TR><TD>Throughstand temperature (°C)<br />< /TD><TD>566<br /></TD><TD>565<br /></TD><TD>578<br /></TD><TD>579<br /></TD> ><TD>586<br /></TD><TD>587<br /></TD><TD>607<br /></TD><TD>608<br /></TD>< TD>616<br /></TD><TD>617<br /></TD><TD>633<br /></TD><TD>633<br /></TD></TR ><TR><TD>End withstand speed r/min<br /></TD><TD>1300<br /></TD><TD>1300<br /></TD><TD>1400 <br /></TD><TD>1400<br /></TD><TD>1500<br /></TD><TD>1500<br /></TD><TD>1700<br /></TD><TD>1700<br /></TD><TD>1800<br /></TD><TD>1800<br /></TD><TD>1900<br /> </TD><TD>1900<br /></TD></TR><TR><TD> ultimate withstand pressure (Mpa)<br /></TD><TD>285<br />< /TD><TD>285<br /></TD><TD>301<br /></TD><TD>300<br /></TD><TD>317<br /></TD> ><TD>318<br /></TD><TD>335<br /></TD><TD>336<br /></TD><TD>354<br /></TD>< TD>355<br /></TD><TD>370<br /></TD><TD>370<br /></TD></TR><TR><TD> expansion and contraction rate/weight Share<br /></TD><TD>0.02<br /></TD><TD>0.02<br /></TD><TD >0.015<br /></TD><TD>0.015<br /></TD><TD>0.01<br /></TD><TD>0.01<br /></TD><TD>0.005 <br /></TD><TD>0.005<br /></TD><TD>0.003<br /></TD><TD>0.003<br /></TD><TD>0.001<br /></TD><TD>0.001<br /></TD></TR><TR><TD>Surface Finish/Ra<br /></TD><TD>1.2<br /></ TD><TD>1.2<br /></TD><TD>0.8<br /></TD><TD>0.8<br /></TD><TD>0.6<br /></TD> <TD>0.6<br /></TD><TD>0.3<br /></TD><TD>0.3<br /></TD><TD>0.2<br /></TD><TD >0.2<br /></TD><TD>0.1<br /></TD><TD>0.1<br /></TD></TR><TR><TD>Surface Hardness/HV<br /></TD><TD>400<br /></TD><TD>400<br /></TD><TD>430<br /></TD><TD>430<br /> </TD><TD>450<br /></TD><TD>450<br /></TD><TD>490<br /></TD><TD>490<br /></ TD><TD>500<br /></TD><TD>500<br /></TD><TD>520<br /></TD><TD>520<br /></TD> </TR><TR><TD>surface resistance/×10¹¹Ω<br /></TD><TD>0.3<br /></TD><TD>0.3<br /></TD><TD>0.5<br /></TD><TD>0.5<br /></TD><TD>0.7<br /></TD><TD>0.7<br /> </TD><TD>1.1<br /></TD><TD>1.1<br /></TD><TD>1.3<br /></TD><TD>1.3<br /></ TD><TD>1.5<br /></TD><TD>1.5<br /></TD></TR><TR><TD>Use Life/time<br /></TD><TD>400<br /></TD><TD>400<br /></TD><TD>450<br /></TD><TD> 450<br /></TD><TD>500<br /></TD><TD>500<br /></TD><TD>600<br /></TD><TD>600< Br /></TD><TD>700<br /></TD><TD>700<br /></TD><TD>800<br /></TD><TD>800<br / ></TD></TR></TBODY></TABLE>

Table 2 lists the specific compositions of the different comparative coatings and the energy parameters of the resulting mirror plates:

Table II

<TABLE style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; MARGIN: auto auto auto -20pt; WIDTH: 494.4pt; BORDER-COLLAPSE: collapse; BORDER-TOP: medium none; BORDER-RIGHT: medium Mso-border-alt: solid windowtext .5pt; mso-yfti-tbllook: 480; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt; mso-border-insideh: .5pt solid windowtext; mso-border-insidev : .5pt solid windowtext" class="MsoNormalTable" border="1" cellSpacing="0" cellPadding="0" width="659"><TBODY><TR><TD><br /></TD>< TD>Comparative Example1<br /></TD><TD>Comparative Example 2<br /></TD><TD>Comparative Example 3<br /></TD><TD>Comparative Example 4<br / ></TD><TD>Comparative Example 5<br /></TD><TD>Comparative Example 6<br /></TD><TD>Comparative Example 7<br /></TD><TD> Comparative Example 8<br /></TD><TD>Comparative Example 9<br /></TD><TD>Comparative Example 10<br /></TD><TD>Comparative Example 11<br />< /TD><TD>Comparative Example 12<br /></TD></TR><TR><TD>Alumina<br /></TD><TD>29 copies<br /></TD> <TD>33 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /></ TD><TD>32 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /> </TD>< TD>32 parts<br /></TD><TD>30 parts<br /></TD><TD>32 parts<br /></TD></TR><TR><TD>铪铪<br /></TD><TD>29 copies<br /></TD><TD>33 copies<br /></TD><TD>30 copies<br /></TD><TD> 32 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /></TD>< TD>32 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /></TD> ><TD>32 copies<br /></TD></TR><TR><TD>矽矽<br /></TD><TD>29 copies<br /></TD><TD> 33 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /></TD>< TD>32 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD><TD>30 copies<br /></TD> ><TD>32 copies<br /></TD><TD>30 copies<br /></TD><TD>32 copies<br /></TD></TR><TR><TD> Cerium oxide<br /></TD><TD>5 parts<br /></TD><TD>9 parts<br /></TD><TD>6 parts<br /></TD>< TD>8 copies<br /></TD><TD>6 copies<br /></TD><TD>8 copies<br /></TD><TD>6 copies<br /></TD> ><TD>8 copies<br /></TD><TD>6 copies<br /></TD><TD>8 copies<br /></TD><TD>6 copies<br />< /TD><TD>8 copies<br /></TD></TR><TR><TD>Silver oxide<br /></TD><TD>5 copies<br /></TD>< TD>9 copies<br /></TD><TD>6 copies<br /></TD><TD>8 copies<br /></TD><TD>6 copies<br /></TD> ><TD>8 <br /></TD><TD>6 copies<br /></TD><TD>8 copies<br /></TD><TD>6 copies<br /></TD><TD> 8 parts<br /></TD><TD>6 parts<br /></TD><TD>8 parts<br /></TD></TR><TR><TD>Palladium oxide<br /></TD><TD>1 copy<br /></TD><TD>5 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies <br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD> 4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD>< TD>4 parts<br /></TD></TR><TR><TD>铋 铋<br /></TD><TD>1 part<br /></TD><TD>5 parts <br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD> 4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD>< TD>4 parts<br /></TD><TD>2 parts<br /></TD><TD>4 parts<br /></TD></TR><TR><TD>镧镧<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>1 copy<br /></TD><TD>5 copies <br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD> 4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD>< TD>4 parts<br /></TD></TR><TR><TD>boron nitride<br /></TD><TD>0<br /></TD><TD>0< Br /></TD><TD>0<br /></TD><TD>0<br /></TD> ><TD>1份<br /></TD><TD>5 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br />< /TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br / ></TD></TR><TR><TD>锑锑<br /></TD><TD>0<br /></TD><TD>0<br /></TD>< TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD> 1 copy<br /></TD><TD>5 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD>< TD>2 copies<br /></TD><TD>4 parts<br /></TD></TR><TR><TD>铊 铊<br /></TD><TD>0< Br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br / ></TD><TD>0<br /></TD><TD>1 copy<br /></TD><TD>5 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD><TD>2 copies<br /></TD><TD>4 copies<br /></TD></TR>< TR><TD>钌钌<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD> ><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD>< TD>0<br /></TD><TD>1 copy<br /></TD><TD>5 copies<br /></TD><TD>2 copies<br /></TD> <TD>4 parts<br /></TD></TR><TR><TD>Zinc oxide<br /></TD><TD>0<br /></TD><TD>0< Br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br / > </TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></TD><TD>0<br /></ TD><TD>1 part<br /></TD><TD>5 parts<br /></TD></TR><TR><TD>Throughstand temperature (°C)<br />< /TD><TD>500<br /></TD><TD>500<br /></TD><TD>567<br /></TD><TD>565<br /></TD> ><TD>576<br /></TD><TD>577<br /></TD><TD>585<br /></TD><TD>588<br /></TD>< TD>606<br /></TD><TD>607<br /></TD><TD>615<br /></TD><TD>615<br /></TD></TR ><TR><TD>End withstand speed r/min<br /></TD><TD>1000<br /></TD><TD>1000<br /></TD><TD>1300 <br /></TD><TD>1300<br /></TD><TD>1400<br /></TD><TD>1400<br /></TD><TD>1600<br /></TD><TD>1600<br /></TD><TD>1650<br /></TD><TD>1650<br /></TD><TD>1700<br /> </TD><TD>1700<br /></TD></TR><TR><TD> ultimate withstand pressure (Mpa)<br /></TD><TD>250<br />< /TD><TD>248<br /></TD><TD>283<br /></TD><TD>282<br /></TD><TD>300<br /></TD> ><TD>299<br /></TD><TD>315<br /></TD><TD>316<br /></TD><TD>334<br /></TD>< TD>333<br /></TD><TD>350<br /></TD><TD>350<br /></TD></TR><TR><TD> expansion and contraction rate/weight Share<br /></TD><TD>0.04<br /></TD><TD>0.04<br /></TD><TD >0.02<br /></TD><TD>0.02<br /></TD><TD>0.02<br /></TD><TD>0.02<br /></TD><TD>0.01 <br /></TD><TD>0.01<br /></TD><TD>0.008<br /></TD><TD>0.008<br /></TD><TD>0.005<br /></TD><TD>0.005<br /></TD></TR><TR><TD>Surface Finish/Ra<br /></TD><TD>1.5<br /></ TD><TD>1.5<br /></TD><TD>1.2<br /></TD><TD>1.1<br /></TD><TD>0.8<br /></TD> <TD>0.8<br /></TD><TD>0.5<br /></TD><TD>0.5<br /></TD><TD>0.3<br /></TD><TD >0.3<br /></TD><TD>0.2<br /></TD><TD>0.2<br /></TD></TR><TR><TD>Surface Hardness/HV<br /></TD><TD>350<br /></TD><TD>350<br /></TD><TD>400<br /></TD><TD>400<br /> </TD><TD>430<br /></TD><TD>430<br /></TD><TD>460<br /></TD><TD>460<br /></ TD><TD>480<br /></TD><TD>480<br /></TD><TD>500<br /></TD><TD>500<br /></TD> </TR><TR><TD>surface resistance/×10¹¹Ω<br /></TD><TD>0.1<br /></TD><TD>0.1<br /></TD><TD>0.3<br /></TD><TD>0.3<br /></TD><TD>0.5<br /></TD><TD>0.5<br /> </TD><TD>0.8<br /></TD><TD>0.8<br /></TD><TD>1.0<br /></TD><TD>1.0<br /></ TD><TD>1.2<br /></TD><TD>1.2<br /></TD></TR><TR><TD>Use life /time<br /></TD><TD>250<br /></TD><TD>250<br /></TD><TD>400<br /></TD><TD>400 <br /></TD><TD>450<br /></TD><TD>450<br /></TD><TD>500<br /></TD><TD>500<br /></TD><TD>600<br /></TD><TD>600<br /></TD><TD>650<br /></TD><TD>650<br /> </TD></TR></TBODY></TABLE>       

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

Claims (8)

A recessed low expansion and contraction mirror plate is a stainless steel plate as a base material, and a surface of the stainless steel plate is provided with a coating, the coating comprising:
30 to 32 parts by weight of alumina;
30 to 32 parts by weight of cerium oxide;
30 to 32 parts by weight of cerium oxide;
6 to 8 parts by weight of cerium oxide;
6 to 8 parts by weight of silver oxide;
2 to 4 parts by weight of palladium oxide; and 2 to 4 parts by weight of cerium oxide. The anti-recess low expansion and contraction mirror plate according to claim 1, wherein the coating further comprises 2 to 4 parts by weight of cerium oxide. The anti-recessed low expansion and contraction mirror plate according to claim 1, wherein the coating further comprises 2 to 4 parts by weight of boron nitride. The anti-recessed low expansion and contraction mirror plate according to claim 1, wherein the coating further comprises 2 to 4 parts by weight of cerium oxide and 2 to 4 parts by weight of cerium oxide. The anti-recess low expansion and contraction mirror plate according to claim 1, wherein the coating further comprises 2 to 4 parts by weight of cerium oxide. The anti-recess low expansion and contraction mirror plate according to claim 1, wherein the coating further comprises 2 to 4 parts by weight of zinc oxide. The anti-recess low expansion and contraction mirror plate according to claim 1, wherein the stainless steel plate has a linear thermal expansion coefficient of 12 to 16 ppm/° C. The anti-recess low expansion and contraction mirror plate according to claim 1, wherein the stainless steel plate has a thickness of 0.2 to 3 mm.