High-Temperature Rolling of Ceramics Without Crack Initiation
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Solution Overview
Problem
Existing toughening methods for low-toughness materials, such as ceramic materials, introduce micro-cracks and reduce reliability due to thin residual compressive stress layers and process instability, limiting mechanical property improvements.
Innovation Solution
A high-temperature rolling processing method involving heating, applying pressure, and periodic rolling to form a residual compressive stress layer without crack initiation, using a device with a force loading, rolling, and temperature control assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chemical treatment is used to introduce residual compressive stress layer, then the surface strengthening effect is achieved, but the layer thickness is very thin and the strengthening effect is limited
Solution Approach 1:
The patent changes the temperature parameter to high temperature conditions, enabling the formation of a thicker residual compressive stress layer compared to chemical treatment methods. The high temperature facilitates greater material plastic deformation and deeper stress layer formation, directly addressing the thickness limitation of chemical treatment.
Solution Approach 2:
The patent employs periodic rolling operations where the rolling wheel repeatedly contacts and deforms the material surface. This periodic mechanical action accumulates plastic deformation over multiple cycles, forming a thicker residual compressive stress layer that overcomes the thin layer limitation of single-step chemical treatment.
2Strength
If heat treatment or shot peening is used, then some materials can be modified, but new crack defects are easily introduced and process stability is poor
Solution Approach 1:
The patent optimizes the temperature parameter to a specific high temperature range that enables plastic deformation without causing thermal damage or crack formation. By controlling temperature within this optimal range, the method achieves material modification while avoiding the crack defects associated with conventional heat treatment or shot peening.
Solution Approach 2:
The patent replaces the high-impact mechanical shock of shot peening with controlled rolling pressure applied at high temperature. This substitution of the mechanical system allows for gradual, controlled plastic deformation that modifies the material without introducing the sudden stress concentrations that cause cracking in shot peening.
3Shape
If conventional rolling is used, then plastic deformation is achieved, but crack initiation occurs due to insufficient temperature control
Solution Approach 1:
The patent changes the temperature parameter to high temperature conditions, which reduces material brittleness and increases ductility. This enables significant plastic deformation through rolling without the crack initiation that occurs at lower temperatures, directly resolving the contradiction between achieving shape change and avoiding cracks.
Solution Approach 2:
The patent applies heat treatment before the rolling operation to pre-condition the material. This preliminary heating action increases material toughness and reduces susceptibility to cracking, allowing subsequent rolling to achieve the desired plastic deformation without crack initiation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves mechanical properties like strength, hardness, and fracture toughness while reducing thermal conductivity and avoiding crack initiation, with adjustable parameters for specific materials.
Implementation Method 1
heating a to-be-processed test piece to a preset temperature, maintaining the preset temperature
Implementation Method 2
cooling the test piece to room temperature to obtain a test piece with a residual compressive stress layer on the surface
Implementation Method 3
applying a preset pressure on a to-be-processed surface of the test piece
Implementation Method 4
plastically deforming the test piece at the preset temperature without crack initiation
Data Source
AI summary
A high-temperature rolling machining method and processing device, and an application of the high-temperature rolling processing device, the device includes a force loading assembly, a rolling assembly, a temperature control assembly, and a carrying assembly; in the high-temperature rolling machining method, an accurate high-temperature rolling operation can be carried out on the surface of a test piece made of brittle materials such as ceramics by using the processing device, and the mechanical properties and electrical properties of the test piece after rolling treatment are remarkably improved, the thermal conductivity is remarkably reduced, and at the same time, crack initiation in the processing process is avoided.