Nitrogen oxygen sensor ceramic chip green body pump electrode chamber structure, ceramic chip green body

Abstract

The utility model discloses a nitrogen oxygen sensor ceramic chip green body pump electrode chamber structure, ceramic chip green body, including second layer ceramic sheet, second layer connecting layer, third layer ceramic sheet, fourth layer connecting layer, fourth layer ceramic sheet, third layer chamber filler, fourth layer pump electrode, second layer pump electrode, ear, the ear is constituted by first part, second part and third part, and the first part of ear is printed on the third layer ceramic sheet, and the second part of ear is printed on the third layer ceramic sheet, and the third part of ear is connected with first part and second part, and the sum of the printing thickness of ear first part and the printing thickness of second layer pump electrode is greater than the printing thickness of second layer connecting layer, and the sum of the printing thickness of ear second part and the printing thickness of fourth layer pump electrode is greater than the printing thickness of fourth layer connecting layer. The utility model reduces the occurrence of internal crack in nitrogen oxygen sensor ceramic chip green body pump electrode chamber structure.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen and oxygen sensor technology, specifically to a nitrogen and oxygen sensor ceramic chip embryo pump electrode chamber structure and ceramic chip embryo. Background Technology

[0002] The nitrogen-oxygen sensor ceramic chip blank consists of seven ceramic sheets and printed patterns on the ceramic sheets. The pump electrode chamber of the nitrogen-oxygen sensor ceramic chip blank includes a second ceramic sheet, a second pump electrode, a second connecting layer, a third ceramic sheet, a third ear, a filling material in the third chamber, a fourth ceramic sheet, a fourth pump electrode, and a fourth connecting layer.

[0003] The current method for fabricating the pump electrode chamber of a nitrogen-oxygen sensor ceramic chip preform involves four steps. First, the second pump electrode and the second connecting layer are sequentially printed onto the second ceramic layer using screen printing. Second, the third ear layer and the third chamber filler are sequentially printed onto the third ceramic layer using screen printing. Third, the fourth pump electrode and the fourth connecting layer are sequentially printed onto the fourth ceramic layer. Fourth, the second, third, and fourth ceramic layers are stacked together and bonded tightly using warm isostatic pressing. After printing, the ceramic chip preform needs to be sintered to form a mature preform before proceeding with subsequent processes.

[0004] Cracks appear in the pump electrode chamber of the existing nitrogen-oxygen sensor ceramic chip blank after sintering. For example, there are cracks between the ear of the third layer and the pump electrode of the second layer, and there are also cracks between the ear of the third layer and the pump electrode of the fourth layer, which leads to poor performance of the obtained nitrogen-oxygen sensor ceramic chip.

[0005] Therefore, this patent application is filed. Utility Model Content

[0006] The purpose of this invention is to provide a structure for the electrode chamber of a nitrogen and oxygen sensor ceramic chip preform pump, and to provide a nitrogen and oxygen sensor ceramic chip preform, thereby solving the technical problem of cracks existing in the electrode chamber of the current preform pump.

[0007] This utility model is achieved through the following technical solution: The first objective of this utility model is to provide a nitrogen and oxygen sensor ceramic chip green pump electrode chamber structure, including a second ceramic sheet, a second connecting layer, a third ceramic sheet, a fourth connecting layer, a fourth ceramic sheet, a third chamber filler, a fourth pump electrode, a second pump electrode, and an ear. The ear is composed of a first part, a second part, and a third part. The first part of the ear is printed on the third ceramic sheet, the second part of the ear is printed on the third ceramic sheet, and the third part of the ear is connected to the first part and the second part. The sum of the printing thickness of the first part of the ear and the printing thickness of the second pump electrode is greater than the printing thickness of the second connecting layer. The sum of the printing thickness of the second part of the ear and the printing thickness of the fourth pump electrode is greater than the printing thickness of the fourth connecting layer.

[0008] As a preferred design, the sum of the printing thickness of the first part of the ear and the printing thickness of the second pump electrode is 1.1 to 1.8 times the printing thickness of the second connecting layer.

[0009] As a preferred design, the sum of the printing thickness of the second part of the ear and the printing thickness of the fourth layer pump electrode is 1.1 to 1.8 times the printing thickness of the fourth layer connecting layer.

[0010] As a preferred design, two ears are provided, symmetrically arranged between the third layer of cavity filling material and the third layer of ceramic sheet, with the first, third, and second parts of the ears connected and surrounding the end face of the third layer of ceramic sheet.

[0011] As a preferred design, each of the ears has a U-shaped structure.

[0012] In a preferred design, the second pump electrode and the fourth pump electrode are located on both sides of the third chamber filler, the second connecting layer and the fourth connecting layer are located on both sides of the third ceramic sheet, the end of the second connecting layer is connected to the second pump electrode, and the end of the fourth connecting layer is connected to the fourth pump electrode.

[0013] As a preferred design, the end of the second connecting layer is connected to the end of the second pump electrode and the end of the first part of the ear, and the end of the second pump electrode is flush with the end of the first part of the ear.

[0014] As a preferred design, the end of the fourth connecting layer is connected to the end of the fourth pump electrode and the end of the second part of the ear, and the end of the fourth pump electrode is flush with the end of the second part of the ear.

[0015] As a preferred design, the second pump electrode, the fourth pump electrode, and the ear are all made of electrode paste, the third chamber filler is a filling paste, and the second connecting layer and the fourth connecting layer are both made of connecting paste.

[0016] The second objective of this invention is to provide a nitrogen and oxygen sensor ceramic chip green body, comprising the pump electrode chamber structure as described in any of the preceding claims.

[0017] The advantages and beneficial effects of this utility model compared to the prior art are: This invention reduces the occurrence of internal cracks in the pump electrode chamber structure of the nitrogen-oxygen sensor ceramic chip by setting the correlation between the printing thickness of the ear and the corresponding printing thickness of the pump electrode and the corresponding printing thickness of the connecting layer, thereby improving the performance of the nitrogen-oxygen sensor ceramic chip. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the exemplary embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 A cross-sectional view of the structure of the nitrogen and oxygen sensor ceramic chip green pump electrode chamber provided by this utility model; Figure 2 A schematic diagram of the structure of the ear; Figure 3 The image shows a scanning electron microscope (SEM) image of the green pump electrode chamber of the nitrogen and oxygen sensor ceramic chip obtained in Experiment 1 after sintering. Figure 4 The image shows a scanning electron microscope (SEM) image of the green pump electrode chamber of the nitrogen and oxygen sensor ceramic chip obtained in Experiment 2 after sintering. Figure 5 The image shows a scanning electron microscope (SEM) image of the green pump electrode chamber of the nitrogen and oxygen sensor ceramic chip obtained in Experiment 3 after sintering. Figure 6 The image shows a scanning electron microscope (SEM) image of the green pump electrode chamber of the nitrogen and oxygen sensor ceramic chip obtained in Experiment 4 after sintering. Figure 7 The image shows a scanning electron microscope (SEM) image of the green pump electrode chamber of the nitrogen and oxygen sensor ceramic chip obtained in Experiment 5 after sintering. Figure 8 The scanning electron microscope image of the green pump electrode chamber of the nitrogen and oxygen sensor ceramic chip obtained in Experiment 6 after sintering; Figure 9 The image shows a scanning electron microscope (SEM) image of the green pump electrode chamber of the nitrogen and oxygen sensor ceramic chip obtained in Experiment 7 after sintering.

[0019] In the picture: 1-Second ceramic plate; 2-Second connecting layer; 3-Third ceramic plate; 4-Fourth connecting layer; 5-Fourth ceramic plate; 6-Ear; 601-First part; 602-Second part; 603-Third part; 7-Third cavity filler; 8-Fourth pump electrode; 9-Second pump electrode. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0021] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not specifically described in order to avoid obscuring the present invention.

[0022] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] In the description of this utility model, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0024] Example 1: like Figure 1 , 2As shown, a nitrogen and oxygen sensor ceramic chip green pump electrode chamber structure includes a second ceramic sheet 1, a second connecting layer 2, a third ceramic sheet 3, a fourth connecting layer 4, a fourth ceramic sheet 5, a third chamber filler 7, a fourth pump electrode 8, a second pump electrode 9, and an ear 6.

[0025] The third ceramic plate 3 is located between the second ceramic plate 1 and the fourth ceramic plate 5. The second pump electrode 9 and the fourth pump electrode 8 are located on both sides of the third chamber filler 7. The second connecting layer 2 and the fourth connecting layer 4 are located on both sides of the third ceramic plate 3. The end of the second connecting layer 2 is connected to the second pump electrode 9, and the end of the fourth connecting layer 4 is connected to the fourth pump electrode 8.

[0026] Two ears 6 are provided, symmetrically positioned between the third layer of cavity filler 7 and the third layer of ceramic sheet 3. Each ear 6 consists of a first part 601, a second part 602, and a third part 603. The first part 601 of the ear 6 is printed on the third layer of ceramic sheet 3, and its two sides are attached to the third layer of ceramic sheet 3 and the second layer of pump electrode 9. The second part 602 of the ear 6 is printed on the third layer of ceramic sheet 3, and its two sides are attached to the third layer of ceramic sheet 3 and the fourth layer of pump electrode 8. The third part 603 of the ear 6 is connected to the first part 601 and the second part 602. The ear 6 as a whole forms a U-shaped structure, so that the first part 601, the third part 603, and the second part 602 of the ear 6 are connected and surround the end face of the third layer of ceramic sheet 3.

[0027] The sum of the printing thickness of the first part 601 and the printing thickness of the second layer pump electrode 9 is greater than the printing thickness of the second layer connecting layer 2. This can prevent the third layer cavity filler 7 from being squeezed into the space between the first part 601 and the second layer pump electrode 9 of the ear 6 during warm isostatic pressing and forming internal cracks after sintering. The sum of the printing thickness of the second part 602 and the printing thickness of the fourth layer pump electrode 8 is greater than the printing thickness of the fourth layer connecting layer 4. This can prevent the third layer cavity filler 7 from being squeezed into the space between the second part 602 and the fourth layer pump electrode 8 of the ear 6 during warm isostatic pressing and forming internal cracks after sintering.

[0028] Furthermore, the sum of the printing thickness of the first part 601 and the printing thickness of the second pump electrode 9 should not be excessively greater than the printing thickness of the second connecting layer 2; otherwise, the third chamber filler 7 will be squeezed into the space between the third ceramic sheet 3 and the second connecting layer 2 near the ear 6 during warm isostatic pressing, and will form internal cracks after sintering. The sum of the printing thickness of the second part 602 and the printing thickness of the fourth pump electrode 8 should not be excessively greater than the printing thickness of the fourth connecting layer 4; otherwise, the third chamber filler 7 will be squeezed into the space between the fourth ceramic sheet 5 and the second connecting layer 2 near the ear 6 during warm isostatic pressing, and will form internal cracks after sintering. Preferably, the sum of the printing thickness of the first part 601 and the printing thickness of the second pump electrode 9 is 1.1 to 1.8 times the printing thickness of the second connecting layer 2. The sum of the printing thickness of the second part 602 and the printing thickness of the fourth pump electrode 8 is 1.1 to 1.8 times the printing thickness of the fourth connecting layer 4.

[0029] Furthermore, the end of the second connecting layer 2 is connected to the end of the second pump electrode 9 and the end of the first part 601 of the ear 6, and the end of the second pump electrode 9 is flush with the end of the first part 601 of the ear 6. The end of the fourth connecting layer 4 is connected to the end of the fourth pump electrode 8 and the end of the second part 602 of the ear 6, and the end of the fourth pump electrode 8 is flush with the end of the second part 602 of the ear 6. This design also helps to avoid cracks in the chamber after subsequent sintering.

[0030] The method for preparing the pump electrode chamber structure in this embodiment is as follows: The first step is to sequentially print the second pump electrode 9 and the second connection layer 2 on the second ceramic sheet 1; The second step is to print the ear 6 and the third layer of cavity filling material 7 on the third ceramic sheet 3 in sequence; Step 3: Print the fourth pump electrode 8 and the fourth connection layer 4 sequentially on the fourth ceramic sheet 5; The fourth step is to stack the second ceramic sheet 1, the third ceramic sheet 3, and the fourth ceramic sheet 5 together, and then use warm isostatic pressing to ensure tight adhesion between the ceramic sheets.

[0031] The second pump electrode 9, the second connecting layer 2, the ear 6, the third chamber filler 7, the fourth pump electrode 8, and the fourth connecting layer 4 are all screen-printed onto the ceramic sheet to form printed layers. Therefore, the printed layers on the ceramic sheet refer to the second pump electrode 9, the second connecting layer 2, the third ear 6, the third chamber filler 7, the fourth pump electrode 8, and the fourth connecting layer 4. The printing thickness mentioned in this invention refers to the thickness of each component obtained using the screen printing process; that is, the word "printing" in "printing thickness" refers only to the process itself. Different printed layers also use different pastes. For example, the second pump electrode 9, the fourth pump electrode 8, and the ear 6 all use electrode paste, the third chamber filler 7 uses filling paste, and the second connecting layer 2 and the fourth connecting layer 4 both use connecting layer paste. Specific pastes used are existing pastes and will not be elaborated upon here.

[0032] The inventors sintered the green embryo obtained by this invention and then conducted tests, specifically: The thicknesses of each printed layer involved in this embodiment are as follows: The printing thickness of the first part of the ear (H1), the printing thickness of the second pump electrode (H2), the printing thickness of the second connecting layer (H3), the printing thickness of the second part of the ear (H4), the printing thickness of the fourth pump electrode (H5), and the printing thickness of the fourth connecting layer (H6).

[0033] Table 1 shows that experiments 1# to 3# indicate that when (H1+H2) / H3 and (H4+H5) / H6 are less than 1.1, the third-layer cavity filler will be squeezed into the space between the first and second pump electrodes of the ear during isostatic pressing, forming internal cracks after sintering; or the third-layer cavity filler will be squeezed into the space between the second and fourth pump electrodes of the ear during isostatic pressing, forming internal cracks after sintering. The scanning electron microscope images of the mature embryos obtained from experiments 1#, 2#, and 3# are shown below. Figure 3 , 4 As shown in Figure 5.

[0034] Table 1, Experiment 7#, shows that when (H1+H2) / H3 and (H4+H5) / H6 are greater than 1.8, the third-layer cavity filler will be squeezed into the space between the first and second connecting layers of the ear during warm isostatic pressing, forming internal cracks after sintering; the third-layer cavity filler will also be squeezed into the space between the second and fourth connecting layers of the ear during warm isostatic pressing, forming internal cracks after sintering. The scanning electron microscope image of the mature embryo obtained in Experiment 7# is shown below. Figure 9 As shown in the image.

[0035] As shown in Table 1 (Experiments 4# to 6#), when (H1+H2) / H3 and (H4+H5) / H6 are between 1.1 and 1.8, only a few gaps exist within the cavity. Scanning electron microscope images of the mature embryos obtained from Experiments 4#, 5#, and 6# are shown below. Figure 6 , 7 As shown in Figure 8.

[0036] Table 1

[0037] The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A structure for a green pump electrode chamber of a nitrogen and oxygen sensor ceramic chip, characterized in that, It includes a second ceramic sheet (1), a second connecting layer (2), a third ceramic sheet (3), a fourth connecting layer (4), a fourth ceramic sheet (5), a third chamber filler (7), a fourth pump electrode (8), a second pump electrode (9), and an ear (6). The ear (6) is composed of a first part (601), a second part (602), and a third part (603). The first part (601) is printed on the third ceramic sheet (3), the second part (602) is printed on the third ceramic sheet (3), and the third part (603) is connected to the first part (601) and the second part (602). The sum of the printing thickness of the first part (601) and the printing thickness of the second pump electrode (9) is greater than the printing thickness of the second connecting layer (2); The sum of the printing thickness of the second part (602) and the printing thickness of the fourth layer pump electrode (8) is greater than the printing thickness of the fourth layer connecting layer (4).

2. The structure of the green pump electrode chamber for a nitrogen and oxygen sensor ceramic chip according to claim 1, characterized in that, The sum of the printing thickness of the first part (601) and the printing thickness of the second pump electrode (9) is 1.1 to 1.8 times the printing thickness of the second connecting layer (2).

3. The structure of the green pump electrode chamber for a nitrogen and oxygen sensor ceramic chip according to claim 1 or 2, characterized in that, The sum of the printing thickness of the second part (602) and the printing thickness of the fourth layer pump electrode (8) is 1.1 to 1.8 times the printing thickness of the fourth layer connecting layer (4).

4. The structure of the green pump electrode chamber for a nitrogen and oxygen sensor ceramic chip according to claim 3, characterized in that, Two ears (6) are provided, symmetrically arranged between the third layer cavity filler (7) and the third layer ceramic sheet (3). The first part (601), the third part (603), and the second part (602) are connected and surround the end face of the third layer ceramic sheet (3).

5. The structure of the green pump electrode chamber for a nitrogen and oxygen sensor ceramic chip according to claim 4, characterized in that, Each of the described ears has a U-shaped structure.

6. The structure of the green pump electrode chamber for a nitrogen and oxygen sensor ceramic chip according to claim 5, characterized in that, The second layer pump electrode (9) and the fourth layer pump electrode (8) are located on both sides of the third layer chamber filler (7), the second layer connecting layer (2) and the fourth layer connecting layer (4) are located on both sides of the third layer ceramic sheet (3), the end of the second layer connecting layer (2) is connected to the second layer pump electrode (9), and the end of the fourth layer connecting layer (4) is connected to the fourth layer pump electrode (8).

7. The structure of the green pump electrode chamber for a nitrogen and oxygen sensor ceramic chip according to claim 6, characterized in that, The end of the second connecting layer (2) is connected to the end of the second pump electrode (9) and the end of the first part (601) of the ear (6), and the end of the second pump electrode (9) is flush with the end of the first part (601) of the ear (6).

8. The structure of the green pump electrode chamber for a nitrogen and oxygen sensor ceramic chip according to claim 6, characterized in that, The end of the fourth connecting layer (4) is connected to the end of the fourth pump electrode (8) and the end of the second part (602) of the ear (6), and the end of the fourth pump electrode (8) is flush with the end of the second part (602) of the ear (6).

9. The structure of the green pump electrode chamber for a nitrogen and oxygen sensor ceramic chip according to any one of claims 5 to 8, characterized in that, The second layer pump electrode (9), the fourth layer pump electrode (8), and the ear (6) are all made of electrode paste. The third layer cavity filler (7) is a filling paste. The second layer connecting layer (2) and the fourth layer connecting layer (4) are both made of connecting paste.

10. A nitrogen and oxygen sensor ceramic chip green body, characterized in that, Includes the pump electrode chamber structure as described in any one of claims 1 to 9.

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