Magnesium oxide reinforced carbon brake pad

Abstract

The utility model belongs to the technical field of brake pads, and particularly relates to a magnesium oxide reinforced carbon brake pad which comprises a carbon-based green body layer and a magnesium oxide ceramic layer, the magnesium oxide ceramic layer wraps the outer surface of the carbon-based green body layer, and the magnesium oxide ceramic layer and the carbon-based green body layer are connected in a zigzag embedding mode to form a composite structure. The carbon-based blank layer and the magnesium oxide ceramic layer are respectively provided with a sawtooth structure, the tooth depths of the sawtooth structures on the carbon-based blank layer are the same or the tooth depths of the sawtooth structures on the carbon-based blank layer are alternately changed in a high-low mode, and gaps of the sawtooth structures of the magnesium oxide ceramic layer and gaps of the sawtooth structures of the carbon-based blank layer are embedded. The service life of the brake pad is prolonged; the oxidation resistance is enhanced, and the performance degradation caused by oxidation is reduced; excellent thermal stability and mechanical performance are maintained, and the material is suitable for high-load and high-temperature working conditions; the interface bonding strength is high, the structure is simple, and manufacturing and machining are easy.

Description

Technical Field

[0001] This utility model belongs to the field of brake pad technology, specifically relating to a magnesium oxide reinforced carbon brake pad. Background Technology

[0002] Carbon brake pads, as high-performance braking components based on carbon fiber reinforced composite materials, still suffer from a significant challenge in the industry due to the degradation of their high-temperature friction performance. Traditional carbon-based brake pads experience a sharp drop in friction coefficient at temperatures exceeding 400°C, severely limiting braking stability under extreme conditions. Some manufacturers have adopted modification solutions involving surface coatings with ceramic coatings such as alumina; however, the difference in thermal expansion coefficients between the coating and the substrate leads to insufficient interfacial bonding strength, resulting in large-scale peeling after frequent thermal shock cycles and significantly shortening their service life. While commercially available carbon / silicon carbide (C / SiC) composite brake pads have increased the upper temperature resistance to 600°C, their manufacturing process is complex, and production costs are far higher than those of traditional cast iron brake pads. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a magnesium oxide reinforced carbon brake pad to solve the problems mentioned in the background art.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0005] A magnesium oxide-reinforced carbon brake pad includes a carbon-based preform layer and a magnesium oxide ceramic layer. The magnesium oxide ceramic layer is wrapped around the outer surface of the carbon-based preform layer and connected by a serrated interlocking form to form a composite structure.

[0006] The carbon-based preform layer and the magnesium oxide ceramic layer are respectively provided with serrated structures. The tooth depth of the serrated structures on the carbon-based preform layer is the same or the tooth depth varies with alternating heights. The serrated structures of the magnesium oxide ceramic layer and the serrated structures of the carbon-based preform layer are interlocked.

[0007] The serrated structure of the carbon-based preform layer is rectangular, pointed, or T-shaped.

[0008] Compared with the prior art, the magnesium oxide reinforced carbon brake pad of this invention has the following beneficial effects: significantly improved wear resistance and extended brake pad service life; enhanced anti-oxidation performance and reduced performance degradation caused by oxidation; maintained excellent thermal stability and mechanical properties, suitable for high load and high temperature conditions; high interfacial bonding strength, simple structure, and easy to manufacture and process. Attached Figure Description

[0009] Figure 1 This is a cross-sectional schematic diagram of the sawtooth structure of the magnesium oxide reinforced carbon brake of this utility model, which has rectangular teeth with the same tooth depth.

[0010] Figure 2This is a schematic cross-sectional view of the serrated structure of the magnesium oxide reinforced carbon brake of this utility model, which has pointed teeth and the tooth depth varies with alternating heights.

[0011] Figure 3 This is a cross-sectional view of the serrated structure of the magnesium oxide reinforced carbon brake of this utility model, which has T-shaped teeth with the same tooth depth.

[0012] In the figure: 1. Carbon-based preform layer, 2. Serrated structure, 3. Magnesium oxide ceramic layer, 4. Dispersed nano-Si3N4 particles. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figures 1-3 As shown, a magnesium oxide reinforced carbon brake pad includes a carbon-based preform layer 1 and a magnesium oxide ceramic layer 3. The magnesium oxide ceramic layer 3 is wrapped around the outer surface of the carbon-based preform layer 1 and connected by a serrated interlocking form to form a composite structure.

[0015] In this embodiment, the carbon-based preform layer 1 is made of high-performance carbon-based material, which has good mechanical properties and thermal stability; the magnesium oxide ceramic layer 3 has high hardness, high wear resistance and excellent oxidation resistance; the two layers are interlocked in a serrated manner, and the magnesium oxide ceramic layer 3 is firmly coated on the surface of the carbon-based preform layer 1, with good bonding effect, forming a tightly bonded composite structure.

[0016] The carbon-based preform layer 1 and the magnesium oxide ceramic layer 3 are respectively provided with serrated structures 2. The tooth depth of the serrated structures 2 on the carbon-based preform layer 1 is the same or the tooth depth varies with alternating heights. The serrated structures 2 of the magnesium oxide ceramic layer 3 are interlocked with the gaps of the serrated structures 2 of the carbon-based preform layer. The serrated structures 2 of the carbon-based preform layer 1 are rectangular teeth, pointed teeth, or T-shaped teeth.

[0017] Example 1

[0018] like Figure 1 As shown, the carbon-based green body layer 1 and the magnesium oxide ceramic layer 3 are respectively provided with serrated structures 2. The serrated structures 2 of the carbon-based green body layer 1 are rectangular teeth with the same tooth depth and flat tooth tips. The serrated structures 2 of the magnesium oxide ceramic layer 3 are fitted into the gaps of the serrated structures 2 of the carbon-based green body layer 1.

[0019] The flat tips of the rectangular teeth and the flat teeth of the rectangular teeth of the magnesium oxide ceramic layer 3 form a uniform surface contact, effectively dispersing thermal stress and mechanical load, and enhancing the interface bonding stability and wear resistance. Its regular geometry simplifies the processing technology, and at the same time, under high temperature conditions, the large area contact reduces local stress concentration, so that the brake pad can still maintain interface integrity and thermal stability under high load, making it suitable for scenarios that require long-term stable braking.

[0020] Example 2

[0021] like Figure 2 As shown, serrated structures 2 are provided on the carbon-based green body layer 1 and the magnesium oxide ceramic layer 3 respectively. The serrated structure of the carbon-based green body layer 1 is a sharp tooth with alternating high and low tooth depth. The serrated structure 2 of the magnesium oxide ceramic layer 3 is interlocked with the gap of the serrated structure 2 of the carbon-based green body layer 1.

[0022] The sawtooth structure 2 of the carbon-based preform layer 1 adopts a pointed tooth structure. The alternating tooth depth design creates a gradient engagement with the magnesium oxide ceramic layer 3. The sharp tooth tips generate a deep embedding effect during braking, dynamically adjusting the stress distribution to suppress crack propagation. The alternating tooth depth structure forms a multi-level barrier in the high-temperature oxidation environment, delaying the oxygen diffusion path and enhancing the adaptability to low-temperature brittle deformation. It is especially suitable for complex working conditions with transient high loads and drastic temperature fluctuations.

[0023] Example 3

[0024] like Figure 3 As shown, the carbon-based green body layer 1 and the magnesium oxide ceramic layer 3 are respectively provided with serrated structures 2. The serrated structures 2 of the carbon-based green body layer 1 are T-shaped teeth with the same tooth depth and flat tooth tips. The serrated structures 2 of the magnesium oxide ceramic layer 3 are fitted into the gaps of the serrated structures 2 of the carbon-based green body layer 1.

[0025] The cantilever structure of the T-shaped teeth and the sawtooth structure 2 of the magnesium oxide ceramic layer 3 form a three-dimensional mechanical interlock. The hook-shaped engagement at the tooth tip significantly improves the interface's shear resistance. Its arc-transition root design alleviates stress concentration. The cantilever part absorbs energy through elastic deformation during braking vibration, reducing noise and fatigue damage. The composite locking mechanism of the T-shaped teeth maintains the interface bonding strength under high temperature and high frequency conditions, making it suitable for extreme environments with stringent requirements for fatigue life and vibration suppression.

[0026] This invention relates to a magnesium oxide-reinforced carbon brake pad. In use, a carbon-based preform layer 1 is first formed by molding and curing short-cut carbon fibers with phenolic resin. Then, a serrated structure 2 is formed on the surface of the carbon-based preform layer 1 using laser etching. Next, a magnesium oxide ceramic layer 3 is formed by plasma spraying with MgO-Si3N4 composite powder. Nano-Si3N4 particles 4 are dispersed within the magnesium oxide ceramic layer 3. The serrated structure 2 of the magnesium oxide ceramic layer 3 interlocks with the serrated structure 2 of the carbon-based preform layer 1. Vacuum heat treatment eliminates interfacial stress, thus forming the magnesium oxide-reinforced carbon brake pad. The serrated interlocking structure between the carbon-based preform layer 1 and the magnesium oxide ceramic layer 3 forms a tightly bonded composite structure, which not only improves the wear resistance of the brake pad but also significantly enhances its oxidation resistance. It is suitable for high-load, high-temperature operating conditions, improving the safety and stability of vehicle braking.

[0027] In the description of this utility model, it should be understood that the terms "between", "in the layer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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 limitations on this utility model.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "molding and curing", "etching", "spraying", "heat treatment" and other terms should be interpreted broadly. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A magnesium oxide reinforced carbon brake pad, characterized in that, It includes a carbon-based preform layer and a magnesium oxide ceramic layer. The magnesium oxide ceramic layer is wrapped around the outer surface of the carbon-based preform layer and connected by a serrated interlocking form to form a composite structure.

2. The magnesium oxide reinforced carbon brake pad according to claim 1, characterized in that, The carbon-based preform layer and the magnesium oxide ceramic layer are respectively provided with serrated structures. The tooth depth of the serrated structures on the carbon-based preform layer is the same or the tooth depth varies with alternating heights. The serrated structures of the magnesium oxide ceramic layer and the serrated structures of the carbon-based preform layer are interlocked.

3. The magnesium oxide reinforced carbon brake pad according to claim 2, characterized in that, The serrated structure of the carbon-based preform layer is rectangular, pointed, or T-shaped.

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