JPS6041025B2 - Ceramic material manufacturing method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing ceramic materials.

According to one of the features of the invention, the manufacturing method comprises up to 9% by weight of silicon nitride, from 1 to 6% by weight of aluminum nitride, from 0.5 to 50% by weight of silica, and from 0.5 to 50% by weight of silica. .0
12% by weight of alumina.
0000 to 200,000° C., where a portion of the silica in the mixture is present as an impurity contained in silicon nitride at the temperature, and the silicon nitride, aluminum nitride, alumina and silica are , producing a reactable composition at said temperature, said composition comprising at least 95% of the weight of the mixture, and said composition in which said silica is in a molar ratio with aluminum nitride of 1:2.
The alumina is present in a 1:1 molar ratio with the remaining aluminum nitride, and the components of the reactable composition react together to form the desired ceramic material. The relative proportions of silicon nitride, aluminum nitride, silica and alumina are such that the atomic ratio of silicon aluminum, nitrogen and oxygen in the composition is 6-Z:Z:8-Z:
It is desirable that it be such that Z. In this case, Z
are each greater than zero and less than or equal to 5. A method according to another feature of the invention comprises aluminum nitride containing no silicon nitride, but between 40% and 60% of the weight of the mixture;
15% to 45% silica by weight and 0.05% by weight
12,000 to 50% alumina
heating at a temperature of 0 to 2000q0, the relative proportions of aluminum nitride, alumina and silica are:
such that a reactable composition is produced at said temperature which constitutes at least 95% of the weight of the mixture, wherein the silica in said composition is in a molar ratio of 1:1 with one part of aluminum nitride. 2, alumina is present so that the molar ratio with the remaining aluminum nitride is 1:1, and the atomic ratio of silicon, aluminum, nitrogen and oxygen in the composition is 6-Z: Z:8-Z:Z, where Z is greater than 4 and less than or equal to 5, and the components of the reactable composition react with each other to form the desired ceramic material.

Advantageously, at this temperature at least a portion of the alumina in the mixture is present as an impurity contained in the aluminum nitride.

at least one of the components present in the mixture at the temperature
Advantageously, the components are introduced into the starting materials used to form the mixture as compounds that react to produce the desired component or components during the heating step.

Conveniently, the compound is silicon oxynitride, aluminum oxynitride, ethyl silicate or aluminum hydroxide.

During the heating step it is desirable to apply pressure to the mixture.

It is also desirable that molten glass be present in the mixture at that temperature. Conveniently, the molten glass is an aluminosilicate glass or a manganese glass or a lithium glass.

Alternatively, the molten glass is magnesium glass.

Advantageously, the magnesium glass is produced by reaction of the magnesium oxide present in the mixture with the glass-forming compound during a heating process. Conveniently, the glass-forming compound is silica.

In producing a ceramic material according to the present invention, the atomic ratios of silicon, aluminum, nitrogen and oxygen conform to the above formula even if each component of the raw material mixture does not fall within the values specified above and in the claims. Although a ceramic phase can be obtained, other phases are also formed at the same time, with the result that the overall structure of the ceramic material obtained is weakened.

That is, such other phases have different thermal properties from the ceramic phase that conforms to the above-mentioned formula, and this difference in thermal properties causes cracks to occur at grain boundaries. especially,
If such other phase is a glass phase, the high temperature strength of the resulting ceramic material is reduced. According to the method of the invention, a ceramic material is obtained which consists essentially only of ceramic phases that conform to the above-mentioned formula.

Thus, by the method of the present invention, a ceramic product having desired properties can be obtained by mixing the ceramic material with other additives depending on the application. BRIEF DESCRIPTION OF THE DRAWINGS The features and advantages of the invention will be explained in more detail below with reference to the accompanying drawings, which show examples of embodiments.

Referring to the drawings, first in the first example, the ceramic material includes 78.48% by weight of powdered silicon nitride and 14.7% by weight of powdered silicon nitride.
It was produced from a starting material consisting of 6% by weight powdered aluminum nitride and 6.7% by weight powdered silica.

In this mixture, the powdered silicon nitride used was Q
It contains 8% by weight of phase material and has an average particle size of 3 microns. Powdered aluminum nitride was supplied by Koch Light in the form of 800 series with an average particle size of 1.5 microns; Shattered. The powdered silica used was manufactured by Hopkin and Williams Limited as pure precipitated silica.
It is supplied by. The powdered silicon nitride of the starting materials used in the mixture contained naturally impure silica as a coating on the silicon nitride particles, and the aluminum nitride contained naturally impure alumina. It is thus understood that the starting mixture of the first example contained alumina in addition to aluminum nitride and silica in addition to silicon nitride. Furthermore, since it is clear that impurities contained in the starting materials silicon nitride and aluminum nitride participate in the subsequent reactions to produce the desired ceramic material,
Prior to forming the mixture, impurity standards in the starting materials were determined by fast neutron activation analysis. Next, as will become clear from the following text, the impurities were taken into consideration when the starting material was made into the above composition. Using the particular starting materials mentioned above, the silica content of the powdered silicon nitride was found to be 4% by weight, and the alumina content of the aluminum nitride was found to be 6% by weight. Thus, the overall composition of the mixture was actually 75.34% by weight silicon nitride, 13.87% by weight aluminum nitride, 0.89% by weight alumina, and 9.9% by weight silica. This composition was determined at point A in FIG. 1, and it is clear that in this figure the rut lines correspond to pure material containing no impurities. Add the required amount of starting materials to form the aforementioned mixture.

Introduced into a liquid mill, where it is used as a liquid body. The mixture was mixed using lopyl alcohol and mixed continuously until the average particle size of the mixture was less than 3 microns. The mixture was then dried and then sieved to remove any powder clumps. Subsequently, a quantification of the impurities in the mixture was carried out to check whether the impurity standards of the starting materials were affected by the aforementioned treatment process, but the colloidal
It was found to be unaltered by mill mixing or drying or sieving operations. The mixture was then filled into the die cavity of a graphite die mold and introduced onto a graphite plug that closed one end of the die cavity. Next, combine the graphite punch to powder the filling,
In this case, all graphite surfaces are 0.0254 (0.
The boron nitride is then brought into contact with the powdered charge previously coated by spraying to a depth of the order of 0.01"). The composition is then introduced into the press, where the temperature and pressure within the press are , 1800 o each for 30 minutes.
o and 9.7 tons/in2 (1.5 tons/in2). The mixture was then held at the temperature and pressure for one hour, at which point the components of the mixture reacted to form the desired ceramic material. After cooling and taking out the reaction product from the die, the crystal phase in the product is changed to C
Detection was by X-ray diffraction using a Unicam spectrometer with r-KQ monochromatic radiation. X-ray analysis revealed that the reaction product was composed almost entirely of a ceramic material with a single crystalline phase, and its formula was as follows: Si6-Z AIZ N8-Z ○
z In this case Z is equal to 1.

Similarly, the ceramic material was found to have a crystal structure based on the B-phase silicon nitride crystal structure, in which case the unit cell dimensions of {a) and W are each 7.648
and 2.938, and the values for 8-phase silicon nitride are 7.623 and 2.914, respectively (see FIG. 2). Using the mixture of the previous example and taking into account the impurities contained in the starting materials, at the elevated reaction temperature the mixture contains 51.3 mol % silicon nitride, 0.8 mol % alumina, and 32.2 mol % alumina. mol% aluminum nitride, and 15
．． The entire composition is comprised of a reactable composition containing 7 mole percent silica. Thus, in the reactable composition, silica is present in the required molar ratio of 1:2 with one part of the aluminum nitride (31.4 mol%) and alumina is present in the required molar ratio with the remaining part of the aluminum nitride. A molar ratio of 1:1 is present (0.8 mol%). In the phase diagram of Figure 1, the shaded triangular area B defines the limits of the various possible mixtures of alumina, aluminum nitride, silica and silicon nitride, in which mixtures of alumina, silica and nitride Aluminum is present in the required molar ratio,
It is entirely composed of compounds that can react with heat. Thus, in the case of the mixture of the above example, once the predetermined composition has been reached, each type of The amount of starting material was calculated. In the reactable composition formed by the mixture of the previous example, the atomic ratio of silicon, aluminum, nitrogen and oxygen is 6-Z:Z
:8-Z:Z (each Z in this case is equal to 1) can be easily calculated. Thus, silicon, aluminum, nitrogen and oxygen in the reactable composition are
It was present in the required proportion in the reaction product, the ceramic material. However, it is to be understood that other mixtures containing the requisite atomic ratios of silicon, aluminum, nitrogen and oxygen and composed entirely of compositions capable of reacting at elevated pressures and temperatures may be used; The mixture lies on line C in FIG. In a second example of the invention, it was necessary to produce a ceramic material having the following formula:

Si6-Z AI2 N6-z ○z In this case Z
is equal to 2.1. In producing the ceramic material, the first
The example starting material was again used, but the starting material was 30. total weight percent aluminum nitride; 50.44 weight percent silicon nitride; 18. The mixture was mixed in proportions such that it comprised % IJ force by total weight. Thus, taking into account the impurities in the starting materials aluminum nitride and silicon nitride, the total composition of the mixture was: 29.0% by weight aluminum;
Silicon nitride is 48.42% by weight, silica is 20.7% by weight, and alumina is 1.85% by weight, and this composition is the first
Indicated by point D in the figure. The process of the first example was then repeated. In this case, at the high temperature in the hot pressing process, the mixture contains 50 mol% aluminum nitride, 24.35 mol%
of silicon nitride, 24.35 mol% silica, and 1.3
The entire reactable composition contained mole percent alumina. Thus, in the reactable composition, the silica is present in a 1:2 molar ratio with a portion of the aluminum nitride (48.7 mol%) and the alumina is present in a molar ratio of 1:2 with the remainder of the aluminum nitride. It was present in a 1:1 ratio (1.3 mol%). Further, the atomic ratio of silicon:aluminum:nitrogen:oxygen is 6-Z:Z:8-Z:Z (in this case, Z is 2.
1) can be easily calculated. Thus,
Silicon, aluminum, nitrogen and oxygen were present in the reactable composition in the proportions required for the ceramic material to be produced. Again, other mixtures consisting entirely of compositions having the requisite atomic ratios for the ceramic material of this example and capable of reacting at high pressures and temperatures may be used, as shown in FIG. Line E shows a possible composition of such a mixture.
As is clear from FIG. 2, in the case of the ceramic material obtained by the method of the second example, the unit cell dimensions of a and c are 7.64 and 2.962, respectively. Third aspect of the present invention
In this example, we repeated the process of the first example, but in this case,
The starting mixture consisted of 43.9% by weight aluminum nitride, 27.65% by weight silicon nitride, and 28.30% by weight silica. Thus, taking into account impurities in the starting materials, the actual composition of the mixture is 41.34% aluminum nitride and 26% silicon nitride. M wt%, silica 29.48 wt% and alumina 2.64 wt%
and this mixture is shown at point F in FIG. At the high temperature of the hot pressing process, the mixture contains 11.04 mol% silicon nitride, 58.80 mol% aluminum nitride, 2
A reactable composition was formed consisting of 8.64 mole % silica and 1.52 mole % alumina. Thus, as before, the atomic ratio of silicon, aluminum, nitrogen, and oxygen in the reactable composition is 6-Z:Z:8-Z:Z(
It can be seen that even using the mixture of this example where Z is equal to 3), the aluminum nitride, silica and alumina were in exactly the required molar ratio. Thus, as expected, the components of the reactable composition react with each other at the high temperature of the hot press reaction to produce a ceramic material of the above formula where Z is equal to 3. As shown in FIG. 2, the dimensions of the unit cell a and c of the ceramic material are 7.70 and 2.70, respectively. It was job 6. The same process was repeated in a fourth example, but in this case the starting mixture was mixed with 48.33% by weight alumina nitride and 2% by weight alumina nitride.
It consisted of 0.12% silicon nitride and 31.55% silica by weight. Thus, taking into account impurities in the starting materials, the actual composition of the mixture is 45.43% aluminum nitride by weight and 19.3% silicon nitride by weight.
1% by weight, 32.36% by weight silica, and 2.90% by weight alumina, and the mixture is shown at point G in FIG. As can be easily calculated, at the high temperature of the hot pressing process, the mixture is
The reactable composition was comprised entirely of silica in a molar ratio of 1:2 to the remaining part and alumina in a 1:1 molar ratio to the remaining aluminum. Furthermore, in this reactable composition, silicon:aluminum:nitrogen:
The atomic ratio of oxygen is 6-Z:Z:8-Z:Z, where Z is equal to 3.3. Thus, as expected, the ceramic phase of the product of the hot press reaction is represented by the above formula, consisting almost entirely of ceramic material having a single crystalline phase, with Z equal to 3.3. As shown in Figure 2, the dimensions of the unit cells of ceramic material a and c are each 7.70.
It was 3 and 2.991. In the case of the fifth example, the previously used starting materials were manufactured by Company of America.
60. % by weight of silicon nitride; 20. Box weight% aluminum nitride and 7.9
A mixture was formed containing % by weight silica and 11.2% by weight alumina. Thus, taking into account impurities in the starting materials, the actual composition of the mixture may be saturated with silicon nitride. 1
8% by weight, aluminum nitride 19.08% by weight, silica 10.32% by weight and alumina 12.42% by weight. The mixture is shown as a dot in FIG. Such a mixture was prepared and hot pressed as before to form a reactable composition containing the required molar ratios of aluminum nitride, IJ and alumina at the hot pressing temperature.
Furthermore, in the reactable composition, the atomic ratio of silicon:aluminum:nitrogen:oxygen is 6-Z:Z:8-Z:
It is easy to see that Z (in this case Z is equal to 2). Therefore, in this case as well, the reaction product, the ceramic material, is represented by the above formula where Z is 2. In a variant of the fifth example, the ceramic material represented by the above formula with Z=2 is provided in which the initial mixture is 64.75
It contains % silicon nitride, 15.35% aluminum nitride, 2.65% silica, and 17.25% aluminum, but was produced from the same starting materials.

Taking into account impurities in the starting material, this composition is 1 in Figure 1.
It is shown in It is clear that the method of the example can likewise be carried out using starting materials consisting only of silica, alumina and aluminum nitride.

However, if such a mixture is used, which naturally does not contain silicon nitride, it will contain silicon, aluminum, nitrogen and oxygen in the proportions necessary to achieve the aforementioned atomic ratios (in which case Z is always greater than 4). A reactable composition is formed by hot pressing. Thus, ceramic materials obtained from mixtures that do not contain silicon nitride always exhibit a Z value greater than 4 in the above formula. The reason for this is
It is easily seen by referring to line J in Figure 1 that in a mixture having a composition on that line, silicon, aluminum, nitrogen, and oxygen are present in the required atomic ratios, expressed by the above formula where Z is equal to 4. produce a ceramic material that is It can thus be seen that line J passes through the aluminum nitride/silica marker line, which of course corresponds to a vertical line that does not include silicon nitride. It will be appreciated that as the silicon nitride content of the mixture in the shaded area B decreases, the value of Z in the above formula representing the ceramic material obtained by the mixture increases. Therefore, if the mixture is AIN, AI
2,03 and a triangular area determined by Si02,
It follows that if the Si is in a region where the content of 4 is zero, the mixture necessarily produces a ceramic material with a Z value of more than 4. To demonstrate the effect of not containing silicon nitride in the sixth example, using the starting materials of the previous example, 51.45% by weight aluminum nitride, 19.18% alumina, and 2 by weight
A mixture was made consisting of 9.37% silica.

Thus, taking into account impurities in the starting materials, the measured composition of the mixture was 48.75% by weight aluminum nitride (6% aluminum nitride).
2.78 mol%), alumina 21.79% by weight (11
．． 25 mol %) and 29.52 wt % silica (25.
97 mol%). The mixture was processed as in the previous example and hot pressed at 185,000. At this temperature, more than 95% by weight of the mixture consists of silica present in a 1:2 molar ratio with one part of aluminum nitride and alumina present in a 1:1 molar ratio with the remaining aluminum nitride. It is composed of a reactionable composition containing and. Furthermore, at this hot pressing temperature, the components of the reactable composition reacted with each other to produce a ceramic material of the above formula with a value of Z equal to 4.6. The dimensions of unit cells a and c of the ceramic material are each 7.7
It was 45Δ and 3.012A. Naturally, a ceramic material having a Z value greater than 4 in the above formula is
They can likewise be produced from starting mixtures containing silicon nitride. Thus, in the seventh example, 10.19% by weight
of silica, 40.77% alumina by weight, 33% by weight. Iso% aluminum nitride and 15.06%
A ceramic material having a Z value of 4.6 was produced by hot pressing a starting mixture of silicon nitride at 1850 oo. In this case all starting materials were those used in Example 5. Thus, taking into account impurities in the starting materials, the mixture contains 12.15 mol% silicon, 28.36 mol% alumina, 52.46 mol% aluminum nitride, and 7.03 mol% nitride. Made of silicon. From these figures it can be easily calculated that the mixture contains more than 95% by weight of a reactable composition containing the required molar ratios of silica, alumina and aluminum nitride at the hot pressing temperature. The reaction product ceramic material had unit cells of the same dimensions a and c as the previous ceramic material. In each of the examples, by hot pressing the starting mixture, a reactable composition is formed that not only contains the required molar ratios of aluminum nitride, alumina and silica, but also consists of the entire volume of the starting mixture. I understand that.

However, it is understood that other materials other than the reactable composition making up at least 95% of the mixture can be present in the mixture at the hot press temperature. The other materials are
Excess amounts of one or more starting materials may be included and are desirable to produce molten glass to aid in densification of the ceramic material produced during hot pressing. Conveniently the molten glass is an alumino, borosilicate or iron silicate glass; alternatives include magnesium, manganese or lithium glass. In the case of magnesium glass,
Preferably, the starting mixture is such that it contains magnesium oxide and a glass-forming agent, where the glass-forming agent is preferably in the form of silica. In each of the above examples, the starting mixture was formed by mixing together the components actually required for the reactable composition.

However, it is clear that one or more of the components required for the reactable composition may also be introduced into the starting material as compounds which decompose into the required components during the hot pressing operation. Thus, for example, aluminum hydroxide can be added to the starting material to add alumina to the reactable composition, and ethyl silicate can be added to the starting material to add the necessary silica to the reactable composition. Other suitable additives to the starting materials are silicon oxynitride (to provide silica and silicon nitride) and aluminum oxynitride (to provide alumina and aluminum nitride). According to the explanation given in the preamble, the ceramic material represented by the above formula in which the value of Z shown in the eighth example of the present invention is 2 is:
8.9% by weight silicon nitride, 29.3% by weight aluminum nitride, 1% by weight silica and 60.0% by weight
of silicon oxynitride at 1700 pm.
produced by hot pressing for 1 hour at In the mixture, the average size of the silicon oxynitride particles is 2
Micron, which is manufactured by Norton Company of
America (No Company of America)
a) and the other starting materials were the same as used in the previous example.

The silicon oxynitride was found to contain free silicon nitride and surface impure silica, which upon analysis were found to be present in the molar ratio necessary to form silicon oxynitride. Thus, silicon oxynitride could be considered as a pure substance for calculating the composition of the starting mixture. Furthermore, since 2 moles of silicon oxynitride are equivalent to 1 mole of silicon nitride and 1 mole of silica, taking into account these equivalents and also taking into account the impurities in the silicon nitride and aluminum nitride, the effect of the starting mixture is The overall composition is 51.09% by weight (26.42 mol%) of silicon nitride and 27.5% by weight (48%) of aluminum nitride.
69 mol %), alumina 1.7 mother weight % (1.25 mol %), and silica 19. $weight% (23.63%)
Met. At the high temperature of the hot pressing process, the mixture contains silica present in a 1:2 molar ratio with one part of the aluminum nitride and alumina present in a 1:1 molar ratio with the remaining aluminum nitride. More than 95% was constituted by the reactable composition. In carrying out the process of the present invention, the starting material must be heated at a temperature of 1200 or higher, below which temperature little or no reactions necessary to produce the required ceramic material occur. do not have.

However, the degree of fertility must not exceed 2000℃,
When this temperature is exceeded, there is a marked tendency for at least some of the contained components to dissociate. However, if it is necessary to produce a ceramic material of the above formula with a Z value close to 5, the phosphorization must be carried out at a temperature above the aforementioned preferred range, so as to increase the solid solubility of the reacting components. No. For this reason, when producing materials with high Z values as in the 6th and 7th examples, hot pressing was performed at 1850 pm. Further, in the above example, the heating step comprises:
It should be noted that although we have been using pressure, it is also possible to heat without applying pressure.

Embodiments of the present invention are listed below.

[1] Contains up to 9% by weight silicon nitride, 1 to 6% by weight aluminum nitride, 0.5 to 5% by weight silica, and 0.05 to 6% by weight alumina heating the mixture at a temperature of 120,000 to 2,000 pm, where a portion of the silica in the mixture is present as an impurity contained in silicon nitride at the temperature, silicon nitride, aluminum nitride, the alumina and silica form a reactable composition at the temperature, the composition comprising at least 95% of the weight of the mixture, and the silica in the composition in a molar ratio with one part of the aluminum nitride. is present in a 1:2 molar ratio with the remaining aluminum nitride, and the alumina is present in a 1:1 molar ratio with the remaining aluminum nitride, such that the components of the reactable composition react with each other to form the required A method for producing a ceramic material, the method comprising producing a ceramic material.

■ The relative ratios of silicon nitride, aluminum nitride, silica, and alumina are such that the atomic ratio of silicon:aluminum:nitrogen:oxygen in the composition is 6-Z:Z:8-Z:Z. The method for manufacturing a ceramic material according to item 1 above, wherein it is desirable that Z is greater than zero and less than or equal to 5.

'3} A mixture containing no silicon nitride but containing 40 to 6% by weight of aluminum nitride, 15 to 45% by weight of silica, and 0.05 to 5% by weight of alumina was heated for 1,200 qo to 2,000 pm. heating at a temperature of 0, wherein the relative proportions of the compacted aluminum, alumina, and silica are such that at the temperature a reactable composition comprising at least 95% heavy earth is produced; In this case, the silica in the composition is present in a molar ratio of 1:2 with one part of the aluminum nitride, and the alumina is present in a molar ratio of 1:1 with the remaining aluminum nitride. , the atomic ratio of silicon, aluminum, nitrogen, and oxygen in the composition is 6-Z:Z:8-Z:Z, where Z is greater than 4 and 5 or less, and the reactable composition A method for producing a ceramic material, characterized in that the components react with each other to produce a necessary ceramic material.

{4- The method according to any of the preceding clauses, characterized in that at said temperature at least a part of the alumina in the mixture is present as an impurity contained in aluminum nitride.

[5] The starting material used to produce the mixture as a compound in which at least a portion of the components present in the mixture at said temperature react to produce the desired component or components required during the heating step. The method according to any of the preceding clauses, characterized in that the method is introduced into a substance.

t6} The method according to item 5, wherein the compound is silicon oxynitride, aluminum oxynitride, ethyl silicate, or aluminum hydroxide.

{71. A method according to any of the preceding clauses, characterized in that during the heating step pressure is applied to the mixture.

'8) A method according to any of the preceding clauses, characterized in that molten glass is present in the mixture at the temperature. 8. The method according to item 8, wherein the molten glass is aluminosilicate glass, borosilicate glass, iron silicate glass, manganese glass or lithium glass.

OQ The method according to item 8, wherein the molten glass is magnesium glass.

(11) The method according to page 10, characterized in that the magnesium glass is produced by reaction of magnesium oxide present in the drum mixture with a glass-forming compound during a heating process.

(12) The method according to item 11, wherein the glass-forming compound is silica.

(13) A ceramic material produced by the method described in any one of Items 1 to 12.

[Brief explanation of the drawing]

FIG. 1 is a fourth phase diagram illustrating by way of example the composition of various mixtures of aluminum nitride, silica, alumina and silicon nitride that can be used in the method of the invention. FIG. 2 is a graph illustrating the dimensions of a unit cell of a ceramic material produced in accordance with the embodiments described herein.
FIG. 1. FIG. 2.

Claims (1)

[Scope of Claims] 1. A method for producing a silicon aluminum oxynitride ceramic material, comprising 0 to 98% by weight of silicon nitride, 1 to 60% by weight of aluminum nitride, and 0.5 to 50% by weight of aluminum nitride.
% by weight of silica and 0.05 to 60% by weight of alumina to a temperature between 1200°C and 2000°C, wherein the amount of silica in the mixture at said temperature is Some, but not all, of the silica is present as an impurity contained by silicon nitride, and further, the silica is present in the mixture at the temperature in a molar ratio of 1:2 with aluminum nitride; The alumina in the mixture at the temperature is present in a molar ratio of 1:1 with the remaining aluminum nitride, such that each component of the mixture reacts with each other at the temperature to form the desired ceramic material. The method characterized in that: 2. A method for producing a silicon aluminum oxynitride ceramic material, comprising the step of heating a mixture consisting of a first component and a second component to a temperature between 1200° C. and 2000° C. The first component constitutes at least 95% by weight of the mixture and
8% by weight silicon nitride, 1-60% by weight aluminum nitride, 0.5-50% by weight silica, 0.05-6% by weight
0% by weight alumina, wherein some, but not all, of the silica is present as an impurity contained by the silicon nitride, and the second component comprises the remainder of the mixture. and consisting of a molten glass in the form of a borosilicate glass, an iron silicate glass, a manganese glass or a lithium glass; The ratio is 1
:2, alumina is present in a molar ratio of 1:1 to the remaining aluminum nitride, and each component of the first component of the mixture reacts with each other at the temperature. The method is characterized in that it produces a desired ceramic material.