CN111928267A - Garbage incinerator fire grate segment with metal ceramic sheet embedded on surface and preparation method thereof - Google Patents

Abstract

The invention relates to an abrasion-resistant garbage incinerator fire grate segment with a metal ceramic piece embedded on the surface. The invention also provides a preparation method of the fire grate segment, which is characterized in that a plurality of pits are formed on the surface of an easily-abraded area of the fire grate segment during the casting forming of the fire grate segment, and then the metal ceramic plates are embedded in the pits by a self-propagating reaction cast welding method, so that the fire grate segment of the garbage incinerator is obtained. The method has the advantages of simple process, high speed and efficiency, low cost, energy conservation, high bonding strength of the ceramic plates which are embedded and welded and long service life of the fire grate plates.

Description

Garbage incinerator grate sheet with surface inlaid metal ceramic sheet and preparation method thereof

technical field

The invention belongs to the technical field of surface engineering, and relates to a garbage incinerator grate sheet with a surface inlaid metal ceramic sheet and a preparation method thereof.

Background technique

The grate sheet of the garbage incinerator pushes the burning garbage under the conditions of high temperature, corrosive gas and friction and wear in the furnace, and the surface in contact with the garbage is seriously eroded. Because the material of the grate sheet is currently 1Gr18Ni9Ti, the corrosion resistance is very good, mainly high temperature wear failure. Domestic waste incinerator grate slices have a short service life (7-10 months), which affects the long-term stable use of the incinerator. It is urgent to improve the service cycle of the grate slices through improvements in design, materials, and processes.

SUMMARY OF THE INVENTION

One of the objectives of the present invention is to provide a garbage incinerator grate sheet with a surface inlaid metal ceramic sheet in order to overcome the above deficiencies, and the grate sheet has a longer service period.

The second purpose of the present invention is to provide a preparation method of the above-mentioned grate sheet, which has a simple preparation process, and the surface of the prepared garbage incinerator grate sheet is inlaid with a metal ceramic sheet and has a high bonding strength and a long service life.

To this end, the first aspect of the present invention provides an abrasion-resistant garbage incinerator grate sheet with a surface inlaid cermet sheet, which includes a grate sheet, a plurality of pits distributed on the surface of the easily erodible area of the grate sheet, and inlaid in the concave Cermet sheet inside the pit.

According to the present invention, the pits on the surface of the easily erodable area of the grate sheet are formed when the grate sheet is cast and formed; the bottom of the pit is flat and the depth is 2-3 mm; preferably, two adjacent pits are connected to each other and They are separated from each other by sharing a side wall, further preferably, the thickness of the side wall is 2-3mm.

In the present invention, the pits include one or more of polygonal pits, circular pits, elliptical pits and curved polygonal pits; the polygons include one or more of rectangle, square, rhombus, and hexagon. one or more; the curved polygon includes one or more of a curved rectangle, a curved square, a curved rhombus, and a curved hexagon.

According to the present invention, the cermet sheet is embedded in the pit by a self-propagating reaction casting welding method; preferably, the cermet sheet and the side wall and bottom of the pit are metallurgically bonded.

In the present invention, the cermet sheet contains Ti, C and Mo; preferably, the cermet sheet is a TiCMo cermet sheet.

The second aspect of the present invention provides a method for preparing a garbage incinerator grate sheet with a surface inlaid cermet sheet as described in the first aspect of the present invention, comprising:

In step B, the C powder, the Ti powder and the Mo powder are mixed and then ball-milled and refined to prepare a TiCMo mixed powder;

Step C, the TiCMo mixed powder is loaded into the polygonal mold, and pressed into a TiCMo compact;

In step D, after pouring the molten steel produced by the aluminothermic reaction into the pit on the surface of the easily erodable area of the grate sheet, immediately put the TiCMo compact into the pit, the molten steel in the pit is welded with the grate sheet, and the compact is ignited at the same time. A self-propagating reaction occurs, and the high-temperature green compact produced by the reaction is welded with molten steel. After the reaction is just over, the surface of the green compact is pressed down, and the green compact is compressed to the same height as the side wall, thereby obtaining a surface inlaid cermet sheet. wear-resistant waste incinerator grate pieces.

According to the present invention, the height of the green compact is 3-5 times the depth of the pit, and the size of the green compact is slightly smaller than the size of the pit on the surface of the grate sheet.

In some embodiments of the present invention, in the TiCMo mixed powder, the atomic ratio of C powder to Ti powder is 1:1, and the amount of Mo powder is 5% of the total mass of C powder and Ti powder.

According to the method of the present invention, before step B, it also includes step A, forming the grate sheet by a precision casting process, and casting a plurality of pits on the erodible part of the grate sheet.

In the present invention, the bottom of the pit is flat and the depth is 2-3 mm; preferably, two adjacent pits are connected to each other and separated from each other by sharing a side wall, further preferably, the thickness of the side wall 2-3mm.

The beneficial effects of the present invention are:

Titanium carbide (TiC) is a cermet with high high temperature chemical stability, almost no chemical reaction with hydrochloric acid and sulfuric acid, and is extremely corrosion-resistant. It is the best choice for anti-abrasion coatings on the surface of grate sheets. Titanium carbide (TiC) atoms are bonded by strong covalent bonds, and the coating has high cohesive strength. It has strong anti-abrasion ability when used as a grate coating. It has high melting point, boiling point and hardness, and its hardness is second only to diamond. It has good electrical conductivity and can be used as a welding material to weld metals. Titanium carbide is a typical transition metal carbide. It is composed of ionic bonds, covalent bonds and metal bonds mixed in the same crystal structure. The crystal structure determines its basic characteristics such as high hardness, high melting point, wear resistance and electrical conductivity. In the past, TiC has been widely used in the manufacture of cermets, heat-resistant alloys, cemented carbides, anti-wear materials, high-temperature radiation materials and other high-temperature vacuum devices. It is an innovation of the present invention to be used as a high-temperature wear-resistant coating. The addition of Mo can refine grains, improve thermal strength, and maintain sufficient strength and creep resistance at high temperatures. The side walls play a role in limiting the lateral movement of the inserts and improving the service life. The method has the advantages of simple process, rapidity and high efficiency, low cost, energy saving, high bonding strength and long service life of the inlaid welded ceramic sheets.

Description of drawings

The present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a garbage incinerator grate sheet with a plurality of pits on the surface of the easily eroded area.

FIG. 2 is a schematic diagram of a mold for making TiCMo compacts.

FIG. 3 is a schematic diagram of a steel sheet for making TiCMo green compacts.

FIG. 4 is a schematic diagram of a punch for making TiCMo compacts.

Figure 5 is a schematic diagram of a TiCMo compact.

FIG. 6 is a schematic diagram of a grate sheet of an abrasion-resistant waste incinerator with a cermet sheet inlaid on the surface.

The meanings of the reference numbers in the figure are as follows:

1 Garbage incinerator grate sheet; 2 pit; 21 bottom of pit; 22 side wall of pit; 3 cermet sheet; 4 mold for making TiCMo compact; Die bottom plate; 6 punches for making TiCMo compacts; 7TiCMo compacts.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. Before the present invention is described in detail, however, it is to be understood that this invention is not limited to the particular embodiments described. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting.

Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although any methods and materials similar or equivalent to those described herein can also be used in the practice or testing of the present invention, the preferred methods and materials are now described.

As mentioned above, the existing waste incinerator grate pieces are mainly damaged by high temperature wear, and the domestically produced waste incinerator grate pieces have a short service life (7-10 months), which affects the long-term stable use of the incinerator. In view of this, the inventors have conducted a lot of research on the high temperature abrasion resistance technology of the grate sheets of the waste incinerator.

The inventors of the present invention have found that several pits are formed on the surface of the easily erodable area of the grate sheet when the grate sheet is cast and formed, and then the cermet sheet is embedded in the pit by the self-propagating reaction casting and welding method. The waste incinerator grate sheet thus obtained , The inlaid welded ceramic sheet and the surface of the grate sheet have high bonding strength, are not easy to fall off when used, and have a long service life. The present invention has been made based on the above findings.

Therefore, the abrasion-resistant waste incinerator grate sheet with a surface inlaid cermet sheet involved in the first aspect of the present invention includes a grate sheet, a plurality of pits distributed on the surface of the easy-to-wear area of the grate sheet, and a cermet embedded in the pit. Wherein, the pits distributed on the surface of the easy-to-wear area of the grate sheet are generated when the grate sheet is cast and formed; the cermet sheet is embedded in the pit by the self-propagating reaction casting and welding method, whereby the cermet sheet and the The side walls and bottom of the pit are metallurgically bonded.

In the present invention, the bottom of the pit is flat and the depth is 2-3 mm; preferably, two adjacent pits are connected to each other and separated from each other by sharing a side wall. Therefore, in the present invention, the pits are also The side walls are called edges. Further preferably, the thickness of the side walls is 2-3 mm.

In the present invention, the pits include one or more of polygonal pits, circular pits, elliptical pits and curved polygonal pits; wherein, the polygons include rectangles, squares, rhombuses, hexagons One or more of curved polygons; the curved polygons include one or more of curved rectangles, curved squares, curved rhombus, and curved hexagons.

Specifically, the pits include one or more of rectangles, squares, diamonds, hexagons, curved rectangles, curved squares, curved diamonds and curved hexagons; preferably rectangles and hexagons and one or more of circular, more preferably hexagonal.

In the present invention, the cermet sheet contains Ti, C and Mo; preferably, the cermet sheet is a TiCMo cermet sheet.

The preparation method of the garbage incinerator grate sheet with the surface inlaid metal ceramic sheet as described in the first aspect of the present invention involved in the second aspect of the present invention includes:

In step A, the grate sheet is formed by the precision casting process, and a plurality of pits are cast on the easily eroded part of the grate sheet, so that the bottom of the pit is flat and the depth is 2-3 mm; and the gap between two adjacent pits is made. connected to each other and separated from each other by sharing a side wall, preferably, the thickness of the side wall is 2-3mm;

In step B, the C powder, the Ti powder and the Mo powder are mixed and then ball-milled and refined to make a TiCMo mixed powder; in the TiCMo mixed powder, the atomic ratio of the C powder to the Ti powder is 1:1, and the Mo powder is The dosage is 5% of the total mass of C powder and Ti powder;

In step C, the TiCMo mixed powder is loaded into the polygonal mold and pressed into a TiCMo compact; the compact height is 3-5 times the depth of the pit, and the compact size is slightly smaller than the pit size on the surface of the grate sheet; Preferably, the density of the compact is 60%-80% of its theoretical density;

In step D, after pouring the molten steel produced by the aluminothermic reaction into the pit on the surface of the easily erodable area of the grate sheet, immediately put the TiCMo compact into the pit, the molten steel in the pit is welded with the grate sheet, and the compact is ignited at the same time. A self-propagating reaction occurs, and the high-temperature green compact produced by the reaction is welded with molten steel. After the reaction is just over, the surface of the green compact is pressed down, and the green compact is compressed to the same height as the side wall, thereby obtaining a surface inlaid cermet sheet. wear-resistant waste incinerator grate pieces.

It is worth mentioning that when the surface of the green compact is pressed downward to compress the green compact to the same height as the side wall, part of the molten steel flows upward along the side wall of the pit, so that the side wall and the green compact are welded together.

In the present invention, the polygonal mold is a mold for preparing TiCMo compacts, which is surrounded by side walls to form a polygonal hollow cylinder without a cover or a bottom plate, and is also referred to as a TiCMo compact mold or a compact mold in the present invention. The green compacting die is used in conjunction with a steel plate and a punch (punch) as a bottom plate for compacting, and is used for making compacts.

Corresponding to the shape of the pit, the mold includes one or more of a polygonal mold, a circular mold, an oval mold and a curved polygonal mold; wherein, the polygon includes a rectangle, a square, a rhombus, and a hexagon. One or more of; the curved polygon includes one or more of a curved rectangle, a curved square, a curved rhombus, and a curved hexagon.

Specifically, the mold includes one or more of rectangles, squares, diamonds, hexagons, curved rectangles, curved squares, curved diamonds and curved hexagons; preferably rectangles, hexagons and One or more kinds of circles, more preferably hexagons.

The term "cast welding" mentioned in the present invention refers to the operation of casting, welding and casting of metal by combining a mold (mold) into a casting mold for casting.

The term "self-propagating reaction" in the present invention refers to a self-propagating high-temperature synthesis reaction; the self-propagation high-temperature synthesis (SHS for short), also known as combustion synthesis (combustion synthesis) technology, is a A technology for synthesizing materials by using the self-heating and self-conduction of the high chemical reaction heat between the reactants. Once the reactants are ignited, they will automatically spread to the unreacted area until the reaction is complete. A new method for compounding high temperature materials.

The term "self-propagating reaction casting welding method" mentioned in the present invention refers to a method for realizing cast welding through self-propagating reaction; operation.

The "theoretical density of the green compact" in the present invention can be calculated according to formula (1) or (2):

Theoretical density of green compact ρ=1/(∑mi/ρi)(1)

In formula (1), ρ is the theoretical density of the green compact, and the unit is g/cm ³ ;

mi is the mass fraction of element i in the mixed powder for preparing the compact;

ρi is the density of element i in the mixed powder for preparing the compact, the unit is g/cm ³ ;

The theoretical density of the green compact ρ=∑Vi×ρi(2)

In formula (2), ρ is the theoretical density of the green compact, and the unit is g/cm ³ ;

Vi is the volume fraction of element i in the mixed powder for preparing the compact;

ρi is the density of element i in the mixed powder for preparing the compact, in g/cm ³ .

In some specific embodiments of the present invention: the method of the present invention is used to prepare the anti-erosion garbage incinerator grate sheet with the surface inlaid cermet sheet, as shown in Figures 1-6, which includes the following steps:

(1) The material of the grate sheet is 1Gr18Ni9Ti. It is formed by precision casting. When casting on the surface that is prone to abrasion failure, a pit 2 with a depth of 2-3mm is cast. The length of the side wall 22 varies according to different parts. Small in length, with long sides at the plane (not shown in the figure), so that two adjacent pits are connected to each other and separated from each other by sharing a side wall, and the thickness of the side wall is 2-3mm (see Fig. 1), the bottom 21 of the pit is a plane;

(2) Prepare Ti+C+Mo=TiCMo self-propagating powder material according to the principle of self-propagating reaction, mix well, and make TiCMo mixed powder;

(3) Put the TiCMo mixed powder into the TiCMo compact mold 4 (see Figure 2) that is slightly smaller than the pit and compact it into a compact 7 (see Figure 5), and the height of the compact 7 is the side wall 22 of the pit 3-5 times the height;

(4) after the molten steel produced by the aluminothermic reaction is poured into the pit 2, the compact 7 is put into the pit 2 immediately, and the molten steel in the pit 2 ignites the self-propagating reaction of the compact 7, and the reaction is just finished adding Pressing to obtain surface inlaid metal ceramic sheets 3 garbage incinerator grate sheets.

It is worth mentioning that during the process of pressing the surface of the green compact 7 downward to compress the green compact 7 to the same height as the side wall 22 of the pit, part of the molten steel flows upward along the side wall 22 of the pit, making the side wall of the pit 22 . 22 is welded with the green compact 7 .

The above-mentioned pit 2 is a polygonal groove formed by a side wall 22 and a bottom 21 , and the polygon is preferably a regular hexagon, a rectangle or a circle, and more preferably a regular hexagon.

Correspondingly, the above-mentioned TiCMo compact mold 4 is surrounded by a side wall 42 to form a polygonal hollow cylinder without a cover or a bottom plate. The green compacting die 4 is used in conjunction with a steel plate 5 (see FIG. 3 ) and a punch (punch) 6 (see FIG. 4 ) as the bottom plate of the compacting die for making the green compact 7 .

The inventors have found that the hexagonal pits 2 are connected to each other and separated from each other by sharing a side wall 22 to form a stable honeycomb structure. Good stability and high temperature and abrasion resistance.

In some further specific embodiments of the present invention, the abrasion-resistant waste incinerator grate sheet with the surface inlaid cermet sheet is shown in FIG. 6 . In Fig. 6, the abrasion-resistant waste incinerator grate sheet with cermet inlaid on the surface includes a grate sheet 1, a plurality of pits 2 distributed on the surface of the easy-to-wear area of the grate sheet, and a cermet sheet 3 embedded in the pit; wherein , the pits 2 distributed on the surface of the easy-to-wear area of the grate sheet are generated when the grate sheet is cast and formed; the cermet sheet 3 is embedded in the pit 2 by the self-propagating reaction casting and welding method, thus, the cermet sheet 3 is metallurgically bonded to the side wall 22 and bottom of the pit 2 .

The bottom of the pit 2 is flat and the depth is 2-3mm; the pit 2 is preferably a regular hexagon; two adjacent pits 2 are connected to each other and separated from each other by sharing a side wall 22 to form a stable Honeycomb structure, preferably, the thickness of the side wall 22 is 2-3mm. The surface inlaid metal ceramic sheet garbage incinerator grate sheet thus formed has good stability and high temperature resistance and abrasion resistance.

The cermet sheet contains Ti, C and Mo; preferably, the cermet sheet is a TiCMo cermet sheet.

Example

In order to make the present invention easier to understand, the present invention will be further described in detail below with reference to the embodiments, which are only for illustrative purposes and do not limit the scope of application of the present invention. The raw materials or components used in the present invention can be obtained through commercial channels or conventional methods unless otherwise specified.

In the present invention, the anti-abrasion performance of the grate sheet is directly detected by the actual consumption rate in production.

Example 1:

Prepare the abrasion-resistant waste incinerator grate sheet with the cermet sheet 3 on the surface, as shown in Figure 1-4.

(1) The material of the grate sheet is 1Gr18Ni9Ti. It is formed by precision casting. When casting on the surface that is prone to abrasion failure, a regular hexagonal pit 2 with a depth of 2-3mm is cast. The length of the side wall 22 varies according to different parts. The side length of the arc or right-angle turn is small, and the side length of the plane is long. The two adjacent pits 2 are connected to each other and separated from each other by sharing a side wall 22 to form a stable honeycomb structure, and the thickness of the side wall 22 is 2-3mm (see Figure 1);

(2) 250 mesh C powder and Ti powder were prepared at an atomic ratio of 1:1, 5wt% Mo powder was added, and ball-milled for 9 hours to prepare a TiCMo mixed powder;

(3) Load the finished TiCMo mixed powder into a regular hexagonal mold 4 (see Figure 2), pass through the green compact mold 4 and the steel plate 5 (see Figure 3) and punch (punch) 6 used as a green bottom plate (See Fig. 4) Used together, in the green compact mold 4, it is pressed into the same shape as the pit 2, and the size is slightly smaller to be pressed into a TiCMo green compact 7 (see Fig. 5), and the density of the TiCMo green compact 7 is 60% of its theoretical density. %-80%, the height of the TiCMo compact 7 is 3-5 times the height of the side wall 21 .

(4) after the molten steel produced by the aluminothermic reaction is poured into the pit 2, the TiCMo compact 7 is put into the pit 2 immediately, the molten steel in the pit 2 ignites the self-propagating reaction of the compact 7, and the reaction is just finished Limit and pressurize, so as to obtain the abrasion-resistant garbage incinerator grate sheet with the cermet sheet 3 embedded on the surface (see FIG. 6 ).

During the process of pressing the surface of the green compact 7 downward to compress the green compact 7 to the same height as the side wall 22 of the pit, part of the molten steel flows upward along the side wall 22 of the pit, so that the side wall 22 of the pit and the green body 7 are welded. combine.

The anti-erosion garbage incinerator grate sheet with the surface inlaid metal ceramic sheet prepared by the above process is shown in Figure 6. In Fig. 6, the abrasion-resistant waste incinerator grate sheet with cermet inlaid on the surface includes a grate sheet 1, a plurality of pits 2 distributed on the surface of the easy-to-wear area of the grate sheet, and a cermet sheet 3 embedded in the pit; wherein , the pits 2 distributed on the surface of the easy-to-wear area of the grate sheet are generated when the grate sheet is cast and formed; the cermet sheet 3 is embedded in the pit 2 by the self-propagating reaction casting and welding method, thus, the cermet sheet 3 is metallurgically bonded to the side wall 22 and bottom of the pit 2 .

The bottom of the pit 2 is flat and the depth is 2-3mm; the pit 2 is preferably a regular hexagon; two adjacent pits 2 are connected to each other and separated from each other by sharing a side wall 22 to form a stable Honeycomb structure, preferably, the thickness of the side wall 22 is 2-3mm. The surface inlaid metal ceramic sheet garbage incinerator grate sheet thus formed has good stability and high temperature resistance and abrasion resistance.

The cermet sheet contains Ti, C and Mo; preferably, the cermet sheet is a TiCMo cermet sheet.

The actual consumption rate in production is directly used to detect the high temperature and anti-abrasion resistance of the abrasion-resistant waste incinerator grate sheet inlaid with metal ceramic sheets on the surface in this embodiment. The results show that this kind of grate sheet in this embodiment has good high temperature resistance. (800-900 ℃) anti-abrasion, its service life is about 5-10 times of the service life of the original grate (the service life of the domestic waste incinerator grate is 7-10 months).

Example 2:

The difference between this embodiment and Embodiment 1 is:

In step (1), a rectangular pit 2 with a depth of 2-3 mm is cast on a surface prone to abrasion failure; two adjacent pits 2 are connected to each other and separated from each other by sharing a side wall 22 to form grid structure.

In step (3), the finished TiCMo mixed powder is loaded into the rectangular mold 4 and pressed into the same shape as the pit 2 .

The difference between the abrasion-resistant garbage incinerator grate sheet with the surface inlaid cermet sheet prepared in the above process and the abrasion-resistant garbage incinerator grate sheet with the cermet sheet inlaid on the surface prepared in Example 1 is that the pit 2 is a rectangle. Correspondingly, the TiCMo cermet sheet 3 is also a rectangle. Two adjacent pits 2 are connected to each other and separated from each other by a shared side wall 22 to form a grid structure.

The actual consumption rate in production is directly used to detect the high temperature and anti-abrasion resistance of the abrasion-resistant waste incinerator grate sheet inlaid with metal ceramic sheets on the surface in this embodiment. The results show that this kind of grate sheet in this embodiment has good high temperature resistance. (800-900 ℃) anti-abrasion, its service life is about 5-9 times of the service life of the original grate (the service life of the domestic waste incinerator grate is 7-10 months).

It should be noted that the above-mentioned embodiments are only used to explain the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to typical embodiments, but it is to be understood that the words used therein are words of description and explanation, rather than words of limitation. Modifications can be made to the invention as specified within the scope of the claims of the invention, as well as modifications of the invention without departing from the scope and spirit of the invention. Although the invention described herein refers to the specific methods, materials and embodiments, it is not intended to be limited to the specific examples disclosed therein, but rather, the invention extends to all other methods and applications having the same function.

Claims (10)

1. An abrasion-resistant waste incinerator grate sheet with a surface inlaid cermet sheet, which comprises a grate sheet, a plurality of pits distributed on the surface of the easily eroded area of the grate sheet, and a cermet sheet inlaid in the pit. 2 . The grate sheet according to claim 1 , wherein the pits on the surface of the easily erodable area of the grate sheet are formed when the grate sheet is cast and formed; the bottom of the pit is flat and has a depth of 2-3 mm; preferably , two adjacent pits are connected to each other and separated from each other by sharing a side wall, further preferably, the thickness of the side wall is 2-3mm. 3. The grate sheet according to claim 2, wherein the pits comprise one or more of polygonal pits, circular pits, elliptical pits and curved polygonal pits; the polygons include One or more of a rectangle, a square, a rhombus, and a hexagon; the curved polygon includes one or more of a curved rectangle, a curved square, a curved rhombus, and a curved hexagon. 4. The grate sheet according to any one of claims 1-3, wherein the cermet sheet is embedded in the pit by a self-propagating reaction casting welding method; preferably, the cermet sheet and the pit are The side walls and bottom are metallurgically bonded. 5 . The grate sheet according to claim 1 , wherein the cermet sheet contains Ti, C and Mo; preferably, the cermet sheet is a TiCMo cermet sheet. 6 . 6. The preparation method of the garbage incinerator grate sheet with the surface inlaid cermet sheet as described in any one of claims 1-5, comprising: In step B, the C powder, the Ti powder and the Mo powder are mixed and then ball-milled and refined to prepare a TiCMo mixed powder; Step C, the TiCMo mixed powder is loaded into the polygonal mold, and pressed into a TiCMo compact; In step D, after pouring the molten steel produced by the aluminothermic reaction into the pit on the surface of the easily erodable area of the grate sheet, immediately put the TiCMo compact into the pit, the molten steel in the pit is welded with the grate sheet, and the compact is ignited at the same time. A self-propagating reaction occurs, and the high-temperature green compact produced by the reaction is welded with molten steel. After the reaction is just over, the surface of the green compact is pressed down, and the green compact is compressed to the same height as the side wall, thereby obtaining a surface inlaid cermet sheet. wear-resistant waste incinerator grate pieces. 7 . The preparation method according to claim 6 , wherein the height of the green compact is 3-5 times the depth of the pit, and the size of the green compact is slightly smaller than the size of the pit on the surface of the grate sheet. 8 . 8. The preparation method according to claim 6 or 7, wherein in the TiCMo mixed powder, the atomic ratio of C powder and Ti powder is 1:1, and the consumption of Mo powder is the total amount of C powder and Ti powder. 5% of the mass. 9. The preparation method according to any one of claims 6-8, characterized in that, before step B, it further comprises step A, forming the grate sheet by a precision casting process, and casting a plurality of pits. 10. The preparation method according to claim 9, wherein the bottom of the pit is flat and the depth is 2-3mm; preferably, two adjacent pits are connected to each other and share a side wall with each other Separation, further preferably, the thickness of the side wall is 2-3mm.

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