Ignition rod made of silicon nitride ceramic material

Abstract

The invention relates to a silicon nitride ceramic material ignition rod, which comprises two wiring ends respectively connected with leads and an extension part connected between the two wiring ends, the extension part has a torsion or bending shape, the two wiring ends are positioned at one end of the silicon nitride ceramic material ignition rod, and the extension part is positioned at the other end of the silicon nitride ceramic material ignition rod. And the middle section of the extension part is positioned at the other end of the ignition rod made of the silicon nitride ceramic material and is a heating position. Compared with other ignition rods in the prior art, the silicon nitride ceramic material ignition rod is high in strength, good in durability, lower in use cost and quite wide in application range.

Description

Technical Field

[0001] The invention relates to the technical field of heating materials, in particular to the technical field of ceramic material ignition rods, and specifically refers to a silicon nitride ceramic material ignition rod. Background Art

[0002] Existing ceramic ignition rods have low strength and poor durability, resulting in a short service life, higher use costs, and difficulty in promotion. Therefore, providing a ceramic ignition rod with high strength, good durability, lower use costs, and a wide range of applications has become an urgent problem to be solved in the field. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings in the prior art and provide an ignition rod made of silicon nitride ceramic material.

[0004] In order to achieve the above-mentioned purpose, the silicon nitride ceramic material ignition rod of the present invention has the following structure:

[0005] The silicon nitride ceramic material ignition rod includes: two terminals 11 respectively connected to the lead 3 and an extension part 12 connected between the two terminals 11, the extension part 12 has a twisted or bent shape, the two terminals 11 are located at one end of the silicon nitride ceramic material ignition rod 1, and the middle section of the extension part 12 is located at the other end of the silicon nitride ceramic material ignition rod 1 as a heating position.

[0006] In the silicon nitride ceramic ignition rod, the extended portion 12 includes at least one reciprocating segment 13, each reciprocating segment 13 is connected end to end and connected in series between the two terminals 11, so that there is a single passage passing through all the reciprocating segments 13 between the two terminals 11.

[0007] In the silicon nitride ceramic ignition rod, there is a gap 14 between the reciprocating segments 13 .

[0008] In the silicon nitride ceramic material ignition rod, the extended portion 12 of the silicon nitride ceramic material ignition rod 1 is located on a plane, and the silicon nitride ceramic material ignition rod 1 is entirely located in a flat plate layer with a certain height.

[0009] In the silicon nitride ceramic material ignition rod, the extension portion 12 of the silicon nitride ceramic material ignition rod is spiral-shaped, and the silicon nitride ceramic material ignition rod 1 is a hollow cylinder as a whole.

[0010] In the silicon nitride ceramic ignition rod, the extension portion 12 and the two terminal ends 11 are an integrally formed structure.

[0011] In the silicon nitride ceramic material ignition rod, the silicon nitride ceramic material is prepared by the following method, which includes ion carbonitriding treatment, mixing, molding and sintering.

[0012] In the ion carbonitriding treatment, the temperature of the vacuum ion carbonitriding heat treatment is 680-950°C, the heating rate is 5-20°C / min, and the holding time is 5-30 minutes; in the ion carbonitriding treatment, the carbon source gas is one of methane, propane and acetylene, the nitrogen source is nitrogen, the mass ratio of the carbon source to the nitrogen source is in the range of 1:8-1:15, and the pressure range of the mixed gas source is 120-1100Pa;

[0013] In the mixture, the average particle size of SiC powder is 45nm and the purity is greater than 99.9%; the average particle size of MgO powder is 25nm and the purity is greater than 99.5%; the average particle size of SiO2 powder is 85nm and the purity is greater than 99.5%; the average particle size of Al2O3 powder is 60nm and the purity is greater than 99.9%; the concentration of PVA solution is 0.3% to 1.5%.

[0014] The silicon nitride ceramic material ignition rod also includes a ceramic insulating shell 2 and a lead 3. The two lead wires 3 are respectively welded to the two terminal terminals 11 and connected to an external power supply. The welding position is located inside the ceramic insulating shell 2, and the extended portion 11 of the silicon nitride ceramic material ignition rod 1 extends outside the ceramic insulating shell 2.

[0015] The silicon nitride ceramic ignition rod of the invention includes two terminals connected to the leads respectively and an extension portion connected between the two terminals, the extension portion has a twisted or curved shape, the two terminals are located at one end of the silicon nitride ceramic ignition rod, and the middle section of the extension portion is located at the other end of the silicon nitride ceramic ignition rod as a heating position. Compared with other ignition rods in the prior art, the silicon nitride ceramic ignition rod of the invention has high strength, good durability, lower use cost, and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a silicon nitride ceramic ignition rod of the present invention;

[0017] Figure 2 It is a schematic structural diagram of the assembly of the silicon nitride ceramic material ignition rod and the insulating shell of the present invention;

[0018] Figure 3 This is a schematic structural diagram of a second embodiment of a silicon nitride ceramic ignition rod of the present invention;

[0019] Figure 4 This is a schematic structural diagram of a third embodiment of the silicon nitride ceramic material ignition rod of the present invention.

[0020] Reference numerals:

[0021] Silicon nitride ceramic material ignition rod 1, ceramic insulating shell 2, lead 3, terminal 11, extension part 12, reciprocating segment 13, gap 14 DETAILED DESCRIPTION

[0022] In order to more clearly understand the technical content of the present invention, the following embodiments are given in detail.

[0023] See also Figure 1 The figure shows the structure of the silicon nitride ceramic material ignition rod of the present invention.

[0024] In one embodiment, the silicon nitride ceramic material ignition rod includes: two terminal terminals 11 respectively connected to the lead wires 3 and an extension portion 12 connected between the two terminal terminals 11, wherein the extension portion 12 has a twisted or bent shape, and the two terminal terminals 11 are located at one end of the silicon nitride ceramic material ignition rod 1, and the middle section of the extension portion 12 is located at the other end of the silicon nitride ceramic material ignition rod 1 as a heating position.

[0025] The extension portion 12 includes at least one reciprocating segment 13, each reciprocating segment 13 is connected end to end and connected in series between the two terminals 11, so that there is a single passage passing through all the reciprocating segments 13 between the two terminals 11. There is a gap 14 between the reciprocating segments 13.

[0026] like Figure 1 , 2 As shown in FIG. 3 , the extended portion 12 of the silicon nitride ceramic material ignition rod 1 is located on a plane, and the silicon nitride ceramic material ignition rod 1 is entirely located in a flat plate layer with a certain height.

[0027] like Figure 4 As shown, the extension part 12 of the silicon nitride ceramic ignition rod 1 is spiral, and the silicon nitride ceramic ignition rod 1 is a hollow cylinder as a whole. Regardless of the shape of the extension part 12 in the silicon nitride ceramic ignition rod, the extension part 12 and the two terminal ends 11 are all integrally formed structures.

[0028] The silicon nitride ceramic material is prepared by the following method, which includes ion carbonitriding treatment, mixing, compression molding and sintering. In the ion carbonitriding treatment, the temperature of vacuum ion carbonitriding heat treatment is 680-950°C, the heating rate is 5-20°C / min, and the insulation time is 5-30min; in the ion carbonitriding treatment, the carbon source gas is methane, propane, acetylene, the nitrogen source is nitrogen, the mass ratio of the carbon source to the nitrogen source is 1:8-1:15, and the gas pressure of the mixed gas source is 120-1100Pa; in the mixing, the average particle size of SiC powder is 45nm and the purity is greater than 99.9%; the average particle size of MgO powder is 25nm and the purity is greater than 99.5%; the average particle size of SiO2 powder is 85nm and the purity is greater than 99.5%; the average particle size of Al2O3 powder is 60nm and the purity is greater than 99.9%; the concentration of PVA solution is 0.3%-1.5%.

[0029] In the mixture, the mass ratio of Si3N4 microbeads, SiC powder, MgO powder, SiO2 powder and Al2O3 powder is (85-98):(4-8):(1-3):(2-8):(3-6).

[0030] In the compression molding, the compression molding pressure is 5-30MPa and the holding time is 5-10s.

[0031] In the sintering, the heating rate is 3-8°C / min, and the maximum temperature holding time is 15-60min.

[0032] The method further comprises sedimentation, wherein the number of ultrasonic cleaning for the sedimentation is 1-5 times, the drying temperature is 50-120° C., and the drying time is 6-12 hours.

[0033] The method further comprises alcohol washing, wherein in the alcohol washing, the hollow silica microbeads have a particle size of 5-25 μm, a shell wall thickness of 0.2-7.5 μm, and a purity greater than 99%.

[0034] The obtained porous Si3N4 ceramic material has a porosity of 69.5-91.3%, a specific surface area of ​​3.52-8.24m2 / g, an average primary pore diameter of 3.6-16.6μm, an average secondary pore size of 40-135nm, a bending strength of 138.4-273.4MPa, and a compressive strength of 23.7-45.1MPa.

[0035] like Figure 2 As shown, the silicon nitride ceramic material ignition rod 1 also includes a ceramic insulating shell 2 and a lead 3. The two lead wires 3 are respectively welded to the two terminal terminals 11 and connected to an external power supply. The welding position is located inside the ceramic insulating shell 2, and the extended portion 12 of the silicon nitride ceramic material ignition rod 1 extends outside the ceramic insulating shell 2.

[0036] In practical applications, the silicon nitride ceramic ignition rod of the present invention can be installed in a variety of application occasions. Figure 2 After assembly as shown, the tail ends of the two leads can be connected to a variety of external power supplies as needed to form a loop. The power supply can be designed to be DC 12V, 20V, 24V, 36V, 110V~120V or 200V~250V. And a variety of power can be used according to the application scenario. After power is turned on, the silicon nitride ceramic material heats up and starts ignition. The silicon nitride ceramic material ignition rod is suitable for most existing barbecue stoves, as well as carbon stoves, gas stoves, etc. It can also be used for the ignition of various gas household appliances such as hydrogen energy combustion batteries, gas air conditioner ignition, gas stoves, gas water heaters, gas ovens, gas dryers, etc., to replace the traditional pulse ignition method.

[0037] The silicon nitride ceramic ignition rod of the invention includes two terminals connected to the leads respectively and an extension portion connected between the two terminals, the extension portion has a twisted or curved shape, the two terminals are located at one end of the silicon nitride ceramic ignition rod, and the middle section of the extension portion is located at the other end of the silicon nitride ceramic ignition rod as a heating position. Compared with other ignition rods in the prior art, the silicon nitride ceramic ignition rod of the invention has high strength, good durability, lower use cost, and a wide range of applications.

[0038] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A silicon nitride ceramic ignition rod, characterized in that: The invention comprises two terminals (11) respectively connected to the leads (3) and an extension part (12) connected between the two terminals (11), wherein the extension part (12) has a twisted or bent shape, the two terminals (11) are located at one end of the silicon nitride ceramic ignition rod (1), and the middle section of the extension part (12) is located at the other end of the silicon nitride ceramic ignition rod (1) as a heating position.

2. The silicon nitride ceramic material ignition rod according to claim 1, characterized in that: The extended portion (12) comprises at least one reciprocating segment (13), each reciprocating segment (13) being connected end to end and connected in series between the two terminal blocks (11), so that there is a single passage passing through all the reciprocating segments (13) between the two terminal blocks (11).

3. The silicon nitride ceramic material ignition rod according to claim 2, characterized in that: There is a gap (14) between each of the reciprocating sections (13).

4. The silicon nitride ceramic material ignition rod according to claim 1, characterized in that: The extended portion (12) of the silicon nitride ceramic material ignition rod (1) is located on a plane, and the silicon nitride ceramic material ignition rod (1) is entirely located in a flat plate layer with a certain height.

5. The silicon nitride ceramic material ignition rod according to claim 1, characterized in that: The extended portion (12) of the silicon nitride ceramic material ignition rod is spiral-shaped, and the silicon nitride ceramic material ignition rod (1) is a hollow cylinder as a whole.

6. The silicon nitride ceramic material ignition rod according to claim 1, characterized in that: The extended portion (12) and the two connection terminals (11) are an integrally formed structure.

7. The silicon nitride ceramic material ignition rod according to claim 1, characterized in that: Silicon nitride ceramic material is prepared by the following method, which includes ion carbonitriding treatment, mixing, molding and sintering. In the ion carbonitriding treatment, the temperature of the vacuum ion carbonitriding heat treatment is 680-950°C, the heating rate is 5-20°C / min, and the holding time is 5-30 minutes; in the ion carbonitriding treatment, the carbon source gas is one of methane, propane and acetylene, the nitrogen source is nitrogen, the mass ratio of the carbon source to the nitrogen source is in the range of 1:8-1:15, and the pressure range of the mixed gas source is 120-1100Pa; In the mixture, the average particle size of SiC powder is 45nm and the purity is greater than 99.9%; the average particle size of MgO powder is 25nm and the purity is greater than 99.5%; the average particle size of SiO2 powder is 85nm and the purity is greater than 99.5%; the average particle size of Al2O3 powder is 60nm and the purity is greater than 99.9%; the concentration of PVA solution is 0.3% to 1.5%.

8. The silicon nitride ceramic ignition rod according to any one of claims 1 to 7, characterized in that: It also includes a ceramic insulating shell (2) and leads (3), wherein the two leads (3) are respectively welded to the two terminal ends (11) and connected to an external power source; the welding position is located inside the ceramic insulating shell (2), and the extended portion (11) of the silicon nitride ceramic material ignition rod (1) extends outside the ceramic insulating shell (2).

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